PUDDLE FORMING AND SHAPING WITH PRIMARY AND SECONDARY LASERS

Abstract

A material processing system for a base material is provided. The system includes a feeder having a distal end proximate to a surface location of the base material. The feeder supplies a deposit material to the surface location. The deposit material has a width having a first side and a second side. A first laser is directed to the deposit material at the surface location. The first laser is directed across the width from the first side to the second side. A second laser is directed to a desired location within the width. A control system drives the process of cladding the deposit material. The control system includes a shape controller to control the movement of the secondary laser along the deposit material based on feedback from a sensor.

Description

STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH

Department of Energy -DE-FG02-08ER84958

APPENDIX

Not Applicable.

BACKGROUND OF THE INVENTION

1. Field of the Invention

The present invention relates to welding equipment and processes, and more particularly to laser cladding, also known as laser welding or additive manufacturing of a material that is deposited on a base material.

2. Related Art

Overlay welding or overlay hard-facing, otherwise known as cladding, involves the deposition of corrosion, erosion or wear resistant materials over a surface of a component to impart the beneficial properties of the cladding materials onto the surface of a metal component or part. The clad material is typically formed as a continuous clad coating of lateral overlapping beads, forming a pore-free, continuous surface of material that increases the thickness of the region. Typically, the cladding process has been performed with arc welding systems for the construction and restoration of a wide variety of metal parts such as tubes, boiler tubes, and vessels, printing rolls, roll dies, engine components such as cranks and cams, agricultural implements such as shovel, knives, and cutters, mining, industrial, and facility equipment such as screws, axels, shafts, oil exploration and down hole components and many more metal components.

For remanufacturing of a worn part, a thin layer of worn-away material is replaced or a thin layer of the beneficial clad material is added to the work piece. The industry is looking for methods of replacing worn-away metal or adding beneficial clad material without changing the part either dimensionally or materially by too much heat. Laser cladding specifically address a need in all these areas by providing a low heat input, thin weld overlay, low dilution cladding. Laser additive manufacturing is a process of making three dimensional solid objects from a digital model, also known as 3D printing. Laser additive manufacturing is achieved using laser cladding as an additive processes, where an object is created by laying down successive layers of material, in this case metal. Laser additive manufacturing uses a high-power laser to fuse metals into 3-dimensional structures. Geometric information may be contained in a computer model to automatically drive the laser additive manufacturing process as it builds up a component layer by layer. Additional software and closed-loop process controls may be used to ensure the geometric and mechanical integrity of the completed part.

Laser cladding is a process in which the heat source is replaced by a laser which can be a CO2, Neodymium:YAG, fiber laser or diode laser. A laser focused as a line source is specifically well suited for wide thin laser cladding and the CO2, Nd:YAG, and fiber laser can be optically transformed to create such a line. Specifically, the diode laser has a naturally occurring spot that is a line with an approximate top hat profile that is very well suited for laser cladding that is preferably thin with low surface roughness and low dilution.

The top hat profile is not the ideal beam to achieve a top hat heating profile. An improved laser beam profile is that which has an intensity power distribution that is more intense at the outer regions. The heating profile also determines the melting profile during cladding. With a perfect top hat beam, the heat will be the greatest in the middle of the beam and taper off isotropically at the edges. This is even more pronounced using a standard Gaussian shaped beam which comes naturally from CO2, fiber coupled Nd:YAG, fiber lasers and diode lasers. Due to surface tension of the melt puddle, material factors, and type of cladding environments, such as cover gas, the resulting clad shape is rounded with a thicker center and tapering toward the ends (a lunular-type shape). This leads to undesirable surface morphology with humping in the middle of the clad track, which subsequently leads to large surface roughness and variable clad thickness during clad overlapping. It is desirable to be able to clad the base material with a uniform cladding material thickness from one clad track to the next. In addition, if the surface is at an edge it is desirable to pull the puddle to the edge without melting the edge. It is also desirable to be able to affect the weld puddle in real time to repair a clad while it is still in a molten or semi-molten state.

In addition, while overlapping a previous clad track previously deposited, clad material is pulled into the subsequent laser puddle due to surface tension leaving less material coverage and/or an undercut at the clad/base interface. Another issue during cladding of a thin layer of dissimilar materials over a base metal is the formation of holes in the clad. Another issue is cladding inside corners with obtuse or acute angle causes the molten puddle to pull to one side or the other.

A need remains for a material processing system that enables control over the melted deposit material.

SUMMARY OF THE INVENTION

A material processing system for a base material is provided. The system includes a feeder having a distal end proximate to a surface location of the base material. The feeder supplies a deposit material to the surface location. The deposit material has a width having a first side and a second side. A first laser is directed to the deposit material at the surface location. The first laser is directed across the width from the first side to the second side. A second laser is directed to a desired location within the width. The deposit material is comprised of a powder, wire or strip. The first laser is comprised of a line source diode laser having a first power level. A second power level of the second laser is less than approximately one fourth of the first power level. A shape controller is connected to the second laser. The shape controller positions the second laser relative to the first side and the second side. The first laser melts the deposit material and the second laser moves the melted deposit material. A beam from the second laser is positioned at least one of before, within, or beyond a beam from the first laser. A beam spot diameter of the beam from the second laser is less than approximately one half a width of the beam from the first laser. In one embodiment, the first laser includes first optics and the second laser includes second optics. The first optics are separate from the second optics.

Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.

BRIEF DESCRIPTION OF THE DRAWINGS

The present invention will become more fully understood from the detailed description and the accompanying drawings, wherein:

FIG. 1A is a schematic view of a laser system formed in accordance with an embodiment of the invention.

FIG. 1B is a schematic view of laser cladding parallel with a primary laser line and with a secondary laser moving about a long melted pool to create smooth walls.

FIGS. 2A and 2B are schematic views of prior art cladding techniques.

FIG. 3 is a screenshot illustrating graphic representations of a top hat laser beam profile.

FIG. 4 is a graphic representation of varying edge intensity profiles.

FIG. 5 is a schematic view of the primary and secondary lasers and the cross-sectional shape of the resulting weld puddle.

FIG. 6 is a schematic view of the range of motion for the secondary laser around a part being welded.

FIGS. 7A and 7B are schematic views of alternative secondary laser shapes, the trailing thermal profile and the corresponding melt puddle.

FIG. 8A illustrates a cladding track being laid on a flat surface using an embodiment of the present invention.

FIG. 8B illustrates molten material being pulled over an edge or to an edge using an embodiment of the present invention.

FIG. 9 is a schematic view of alternative approach angles of the secondary laser.

FIG. 10 illustrates parts that have been welded using various techniques.

FIG. 11 is a flowchart of a method of additive manufacturing in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

The following description of the preferred embodiment(s) is merely exemplary in nature and is in no way intended to limit the invention, its application, or uses.

The present invention improves on welding and cladding techniques using laser systems. Generally, as shown in FIGS. 1A and 1B, the system of the present invention includes a primary line source laser beam, a secondary laser and a material feeder. The material feeder conveys a deposit material to the surface of a base material or work piece. In the preferred embodiment, the deposit material is in a powder form, and the distal end of the feeder proximate to the base material defines the width of the deposit material that is supplied to the base material. This material can be feed with other means such as cold wire or hot wire feeding, strip feeding, and thermal metal spray techniques. The primary line source laser beam has a width that is approximately equal to the width of the deposit material being supplied by the feeder. The secondary laser or lasers targets only a portion of the deposit material, such as on one side of the primary laser.

A control system drives the cladding process. In particular, the control system includes a shape controller to control the movement of the secondary laser along a portion of the deposit material. Geometric information related to the deposit material may be contained in a computer model to automatically drive the primary laser and the secondary laser as they build the deposit material on the work piece layer by layer. Additional sensor software and closed-loop process controls may be provided within the control system to ensure the geometric and mechanical integrity of the completed part. In particular, at least one sensor monitors the melted deposit material and the geometric and mechanical integrity of the part. The sensor sends feedback to the control system to adjust the position and parameters of the secondary laser to optimize control of the melted deposit material in forming the part. The control system also includes means with which to adjust various parameters of the primary and secondary lasers, such as power output, intensity, and location. The primary laser includes primary optics that are separate and independently controlled from secondary optics in the secondary laser. The primary and secondary laser are independently controlled by the control system. In one embodiment, the primary and secondary laser may be manually controlled by an operator.

In the embodiment illustrated in FIG. 1B, the system of the present invention may be utilized to provide multi-layer build-up of a part by utilizing laser cladding parallel with the line of the primary laser as the part is moved across the primary laser beam. The secondary laser moves about the melted pool of deposit material to maintain the geometric shape of the part. In particular, the secondary laser maintains smooth side walls of the part. Additionally, the secondary laser ensures the mechanical integrity of the part by reducing holes and solidification defects. As described above, the sensor provides feedback to the control system to control the movement and properties of the secondary laser to ensure the geometric shape of the sidewalls and the mechanical integrity of the part as the part is built-up through multiple layers.

The selective targeting of the secondary laser to only a portion of the deposit material can change the material properties such as surface tension in the localized area. The combined power of the primary and secondary lasers produces a temperature variation in the melt compared with the region with just the primary laser. Fluid motion results from surface tension gradient and gravity gradients that are caused by the temperature variations in the melt and produces a stifling motion in the laser cladding puddle. The directions of the fluid motion are strongly influenced by the laser beam heating the liquid surface. Accordingly, the addition of the secondary laser to a particular section of material that is melted by the primary laser or line source laser moves or draws or pulls material to a desirable/strategic region of the weld puddle as the deposit material is being laid on the work piece. The secondary laser can also be used to keep the deposit material in a molten form for a longer period of time in strategic locations. This is beneficial for removing defects such as holes and solidification defects that would otherwise remain in the clad material after solidification with a single laser system.

According to a particular example of the present invention, the primary line source laser can target a linear beam that is approximately 1 mm-50 mm in length, and the secondary laser can target the deposit material on one side of the primary laser with a beam spot that is approximately 0.1 mm-5 mm in diameter. In one embodiment, the beam from the secondary laser has a diameter that is less than approximately one half of the width of the beam from the primary laser. In this arrangement, the secondary laser preferably has a power level less than approximately 25% of the primary laser's power. For example, with a 4,000 Watt primary laser, the secondary laser may have a 400 Watt power level.

The present invention is an improvement over current laser welding and cladding systems that use a single laser. The progressive improvement toward a thinner flatter laser clad (change in wetting angle, θ) is shown in FIG. 2A. As the laser beam goes from round, rectangular and line shaped beams on the work piece for a fixed amount of dilution, the wetting angle is improved. The typical clads from the Gaussian beam, rectangular beam and line source are shown on a work piece. The shape of the laser beam determines the shape of the welded clad profile and subsequently the amount of overlap required to achieve a smooth track to track ripple free surface and thus require less post-machining to achieve machined surface clean up.

As shown in FIG. 2B, even with a line source laser having the top hat profile beam shown in FIG. 3, humping in the middle of the clad leads to undesirable surface morphology, which requires more overlap over subsequent tracks to tie-in to the previous track in order to achieve uniform thickness and a satisfactory clad smoothness with a reduced amount of post machining. These weld parameters are all material and cover gas dependent. The humping in the middle of the track leads to large surface roughness and variability in the clad thickness during clad overlapping. Accordingly, the wider the clad and the larger the wetting angle the easier it will be to tie into the subsequent clad.

However, the disadvantages of the current systems are that they are not flexible enough to cover the whole range of issues associated with high power laser cladding. Most of the other techniques cannot be used with very high power lasers in the extreme high deposition laser cladding environment. The systems which include beam forming optics, whether fixed or adaptable are not amenable to very high powers due to the detrimental effects of thermal and radiative feedback. In addition, the power densities of previously known systems are incompatible with implementing the desired effect. The relationship between the material input, powder feeder and the laser beam that has to be optimized, and modification of the laser beam would create the need to modify the powder feed deposition profile. These modifications would have to be different for different work piece shapes, materials, material purity, preheats, and cover gas type and effectiveness all known to one skilled in the art, thus limiting the utility and ease of use for such systems.

As shown in FIG. 4, the intensity on the edges of the laser beam may be increased to decrease the humping for some clad materials and flatten the top of the clad. In prior art systems, such variation in intensity or a singled sourced laser would be produced by the optics, not by multiple independently sourced beams. The present system decouples the shaping of the weld puddle by the secondary laser from the energy from the primary laser energy that is required to form the weld puddle with the powder being supplied by the feeder. Accordingly, the primary laser is the work horse that melts the deposit material, and the second laser influences the already molten puddle into the desired shape. With the decoupled system of the present invention, the second laser does not have to be directly collinear with the primary laser beam but can be ahead, in, or behind the laser beam. In addition, the secondary laser doesn't share optics with the primary laser beam. Rather, the primary laser includes primary optics that are transformed to focus the primary laser as a line source laser. The secondary laser includes secondary optics that are transformed to focus the secondary laser as a line source laser, beam spot laser, rectangular laser, or any other suitable shape for the application of the secondary laser.

The use of the secondary beam to shape the weld puddle allows for a significant decrease in the overlap distance (do) compared with the tie-in required by previous systems. As shown in FIG. 5, the shorter overlap distance allows for a longer step-over distance (ds) which results in improved overlay efficiency. Current single-laser systems may need to overlap 50% of the previous cladding track whereas the present invention significantly reduces the overlap, thereby reducing the overall time to process a given area of base material.

The decoupling of the secondary beam from the primary beam and the feeder supplying the deposit material allows the high power primary laser to be optimized for the power and energy, as the main melting laser, for the weld metal deposition while also allowing the low power secondary laser to shape and steer the molten puddle. The resulting molten puddle can therefore be optimized for improved deposition efficiency, reduced tie-in overlap distance thus reducing the total heat required to get a good smooth clad, thereby reducing process time, pre-machining and post machining requirements. The decoupling of the beams also allows the secondary beam to be positioned around the part being processed, as shown in FIG. 6. The secondary beam can be moved in any position around the main cladding head and can come in at a large degree of angles about the main cladding laser head or end effector. This allows ease of implementation and solves the primary problem in a manufacturing environment in which the laser beam has to access a diverse set of surface morphologies found on 3D parts. It will also be appreciated that the secondary beam does not need to be a round spot and may be structured into a line as shown in FIG. 7A. Varying the shape of the secondary beam provides additional flexibility in pulling and steering the molten puddle. Additionally, FIG. 7B shows that the various shapes of the secondary beam can be positioned relative to the primary beam which provides even more flexibility in manipulating the molten puddle.

Another benefit of decoupling the secondary shaping laser from the primary melting laser is that it allows for greater scalability than is currently available. With current laser welding systems, increasing the power of the primary laser requires a much greater degree of control and monitoring over the system. With the greater the width of the line, the higher powers, larger optics, system complications, and expenses go up exponentially with current laser welding systems. It would desirable to have a line source laser optimized in which the resulting clad has the smallest overlap requirements without adding to system complication and expense. Increased power of the laser can result in more detrimental spurious thermal and radiation effects which lead to overheating and can cause a catastrophic failure of the entire cladding system. Accordingly, increasing the power of the laser in many current systems, which have incorporated beam shaping optics to optimize puddle shape, would require very expensive optics, external cooling and monitoring. Therefore, many current systems, with beam shaping optics, are not scalable to a higher power due to the exorbitant cost associated with the system at high powers and high energy densities. In comparison, the present invention simplifies the system. By decoupling the secondary laser, the primary high power laser is more easily tuned to provide the desired beam shape at the highest possible powers in order to achieve high deposition efficiency resulting in thin flat clads while the shaping of the resulting molten puddle by the secondary laser, thereby giving the greatest potential to decrease humping and the tie-in overlap area while also allowing the optimization of edge profiles and fixing unpredictable blow outs and defects.

One of the biggest impediments for the implementation of 3D manufacturing is deposition rate. Current state-of-the-art 3D manufacturing can create 3D metal parts that are very close to form, fit and function, i.e very high mechanical accuracy but at the cost of very low additive deposition rates. When the deposition rate is increased one loses the ability to control the melt puddle shape and thus form, fit and function, thus requiring subsequent machining. The present invention allows dramatically increasing the deposition rate while at the same time controlling the final solidified shape.

Examples of the system of the present invention are shown in FIGS. 8-10. In FIG. 8A, a cladding track on a flat surface is being laid using the inventive system. In FIG. 8B, the inventive system is used to pull the molten material over the edge or to an edge, thereby eliminating a two-step process in which the cylindrical body would first be clad and then the edge would need to be built up. The in situ formation of the cladding all the way to the edge is a more efficient process that reduces costs. The alternative arrangements of the secondary laser in FIG. 9 show that the secondary laser is insensitive to the approach angle. Accordingly, the molten puddle can be shaped from a variety of perspectives and locations. The variation in the location of the secondary laser adds to the total flexibility of the present system because it allows the arrangement of the design to be varied to avoid interference with the work piece or other equipment that could otherwise be an obstruction.

Based on the description and examples above, it will be appreciated that the present invention provides an advantage over the currently known systems by being able to shape the puddle such that the bead of the final solidified bead is improved on flat areas, on edges, inside corners, and holes, and is amenable to tie-in to subsequent laser cladding tracks. The shape control is achieved by one or more additional laser beams that are strategically placed in locations to pull the weld puddle by either affecting surface tension or keeping the material molten for a longer period of time. The shape control can also be used to steer the weld puddle around a hole or to repair holes or blow outs during cladding.

This same surface tension, which drives the convection vortex currents, is also responsible for the surface profile, ripples, and defects which are frozen “in-place” due to the rapid solidification inherent in laser cladding. Accordingly, the in-situ control of the molten puddle can also be used to resolve other issues with laser welding and cladding, as shown in FIG. 10. While the puddle remains in its molten state, the secondary laser can be used to reduce pinholes that result from frozen “in-place” explosions (rapid out gassing of pores and exothermic reactions). In addition, non-flat geometries of a work piece, such as waterwall panels which are of non-flat non-cylindrical geometry, and out of position welds such as 5 G welds, will heavily influence the shape of the puddle. As is well known, a 1G [groove] weld is different from a 1F [fillet] weld primarily due to the influence of the shape of the base and the orientation of the base with respect to gravity force vector, whereas a single laser system would result in less than optimal results for such curved shapes, the primary and secondary lasers of the present invention can work together to optimize a cladding of work pieces with curved geometries.

The puddle steering is achieved by changing the surface tension on the surface of the puddle in strategic locations thus affecting the puddle shape and subsequent thickness by illuminating these locations with one or more secondary laser beams. These secondary laser beams preferably use much less power than the primary laser beams. To produce the puddle steering, the secondary laser beams may have less than 25% of the primary laser's power level. Secondary laser power levels may even be in the range of 5% or 10% of the primary laser's power. These laser beams are such that they are of different geometries depending on the application, i.e., line, spot, or rectangular in shape. It will also be appreciated that beam scanning optics can be employed to rapidly move the secondary beam in order to fix holes and blow outs and also scan around small holes

The base material can be flat, circular or complex shapes. The shape, quality and deposition rates of the cladding or weld overlay are enhanced as a result of the system's structural and control features of the present invention. The base material can be out of position as that described by the weld positions 2G, 2F, 3G, 3F, 4F, 4G, 5F, 5G, 6G, and any other position as known by one skilled in the art of welding.

Features and benefits of the present invention are listed below. Two or more lasers are used with one being a primary laser for melting the deposit material and another laser being secondary with lower power for shaping the molten puddle. The secondary laser beam does not have to be collinear of not in the same optical train. The secondary laser beam is independent of the material feeding mechanism. The second laser beam is used to affect the final puddle shape such that the clads are tied in together more efficiently. The inventive system relates to increasing the deposition efficiency by affecting the clad morphology. The inventive system relates to decreased dilution while at the same time achieving good surface morphology. The inventive system enables controlling the final solidified shape after the material is initially melted, i.e. outside the main radiation area. The inventive system enables the modification of clad morphology during 3D build up. The inventive system will help reduce the side wall defect and therefore reduce the amount of machining time required to achieve part clean up.

The inventive system enables edge build out simultaneously with line source laser cladding. The inventive system reduces solidification cracking. The inventive system controls the shape of the weld puddle around different work piece geometries, such as edges, holes, inside corners and outside corners.

FIG. 11 illustrates a method for utilizing the system described herein. The method includes directing a deposit material through a feeder to a surface location proximate to the base material. The deposit material may be directed from at least one of a wire feed or a hot wire feed. The deposit material directed by the feeder has a width with a first side and a second side. A first laser is aimed at the deposit material at the surface location. The first laser has a beam width extending substantially across the first side to the second side. A second laser is directed toward a selected location between the first side and the second side, wherein the selected location is inclusive of the first side and the second side. The second laser is positioned at the selected location with a shape controller and may be positioned before, within, or beyond a beam from the first laser. The method also includes melting the deposit material with the first laser and moving the melted deposit material with the second laser. The second laser has a power level less than approximately one fourth of a power level of the first laser. Additionally, a beam spot diameter of a beam from the second laser is less than approximately one half a width of a beam from the first laser.

The present invention provides and/or improves upon deposition rate by maximizing deposition rate without sacrificing clad morphologies, in situ defect mitigation (fixing blow holes), edge definition, edge definition around holes, inside fillet definition, lowering dilution, thinner clads, improved cladding morphology (flatter, thinner clads), control of solidification cracking issues, improved wire feed laser cladding, improved 3D laser additive manufacturing.

The present invention, by decoupling the puddle shaping produced by the low-power secondary laser from the melting of the deposit material by the “workhorse” high-power primary laser, is significantly different from prior systems which would try to use a single laser beam and shape the beam using optics. The present system is also different from arc weld systems that use multiple arcs, with one arc used in the heating process when the deposit materials are first supplied to the surface followed by a second arc to smooth out the overlay. In comparison, the primary and secondary lasers of the present invention are preferably used in combination with each other on the weld puddle as described above. Another known system that is different from the present invention uses a magnetic field to influence the puddle shape.

The present invention improves the clad profile in a way that increases the clad deposition efficiency without adding complexity to the main laser cladding head. The present invention provides flexibility in position, power, beam shape, and temporal coherence (resolution or constructions) while reducing the complexity of the system and reducing the cost of implementation. All of this is done without compromising the robustness of the primary laser because the secondary laser is decoupled. It will also be appreciated that the present invention can be used under a wide range of process material weld properties, cover gas, base material and other welding essential variables.

The embodiments were chosen and described to best explain the principles of the invention and its practical application to persons who are skilled in the art. As various modifications could be made to the exemplary embodiments, as described above with reference to the corresponding illustrations, without departing from the scope of the invention, it is intended that all matter contained in the foregoing description and shown in the accompanying drawings shall be interpreted as illustrative rather than limiting. Thus, the breadth and scope of the present invention should not be limited by any of the above-described exemplary embodiments, but should be defined only in accordance with the following claims appended hereto and their equivalents.

Claims

1. A material processing system for a base material comprising: a feeder having a distal end proximate to a surface location of the base material, wherein said feeder supplies a deposit material to said surface location, said deposit material having a width having a first side and a second side;a first laser directed to said deposit material at said surface location, wherein said first laser is directed across said width from said first side to said second side; anda second laser directed to a desired location within said width.

2. The invention of claim 1, wherein said deposit material is comprised of a powder, wire or strip, wherein said first laser is comprised of a line source diode laser having a first power level, and wherein a second power level of said second laser is less than approximately one fourth of said first power level.

3. The invention of claim 1 further comprising a sensor and a shape controller, said shape controller connected to said second laser, wherein said sensor monitors the deposit material and said shape controller positions said second laser relative to said first side and said second side based on feedback from said sensor.

4. The invention of claim 1, wherein said first laser melts said deposit material and said second laser moves said melted deposit material.

5. The invention of claim 1, wherein a beam from said second laser is positioned at least one of before, within, or beyond a beam from said first laser.

6. The invention of claim 1, wherein a beam spot diameter of a beam from said second laser is less than approximately one half a width of a beam from said first laser.

7. The invention of claim 1, wherein said first laser includes first optics and said second laser includes second optics, said first optics separate from said second optics.

8. A material processing system for a base material comprising: a material feed location;a first laser having a line source beam aimed toward said material feed location, wherein said first laser has a first power level and said line source beam has a first side and a second side; anda second laser directed to a selected location between said first side and said second side, wherein the selected location is inclusive of the first side and the second side, wherein said second laser has a second power level less than approximately one fourth of said first power level.

9. The invention of claim 8 further comprising a sensor and a shape controller, said shape controller connected to said second laser, wherein said sensor monitors the deposit material and said shape controller positions said second laser relative to said first side and said second side based on feedback from said sensor.

10. The invention of claim 8, wherein said first laser melts a deposit material disposed on said feed location and said second laser moves said melted deposit material.

11. The invention of claim 8, wherein a beam from said second laser is positioned at least one of before, within, or beyond a beam from said first laser.

12. The invention of claim 8, wherein a beam spot diameter of a beam from said second laser is less than approximately one half a width of a beam from said first laser.

13. The invention of claim 8, wherein said first laser includes primary optics and said second laser includes second optics, said first optics separate from said second optics.

14. A method for processing a base material comprising the steps of: directing a deposit material through a feeder to a surface location proximate to the base material, wherein the deposit material directed by the feeder has a width with a first side and a second side;aiming a first laser at the deposit material at the surface location, wherein the first laser comprises a beam width extending substantially across the first side to the second side; and aiming a second laser toward a selected location between said first side and said second side, wherein the selected location is inclusive of the first side and the second side.

15. The method of claim 14, wherein directing a deposit material through a feeder further comprises directing the deposit material from at least one of a wire feed or a hot wire feed.

16. The method of claim 14, wherein the second laser has a power level less than approximately one fourth of a power level of the first laser.

17. The method of claim 14 further comprising: monitoring the deposit material with a sensor; andpositioning the second laser at the selected location based on feedback from the sensor.

18. The method of claim 17 further comprising positioning a beam from the second laser at least one of before, within, or beyond a beam from the first laser.

19. The method of claim 14 further comprising melting the deposit material with the first laser and moving the melted deposit material with the second laser.

20. The method of claim 14, wherein a beam spot diameter of a beam from the second laser is less than approximately one half a width of a beam from the first laser.