This invention refers to a process in which two wires not energized are injected two by auxiliary heads in the electric arc generated by 5 the electrode wire, with the purpose of performing welding for joining and coating metal. The process can be used for both GMAW (Gas Metal Arc Weld) and FCAW (Flux Cored Arc Weld) processes.
The GMAW and the FCAW welding processes are already known and consolidated, where the arc is established between the workpiece and a consumable in a wire shape that are fed continuously. The arc casts the wire as it is fed to the weld pool. The weld metal is protected from the atmosphere by the gas flow (or gas mixture) inert or active, as well as for the gas and the slag. These welding processes are widely used when a greater productivity or a robot welding is needed.
Despite the widespread use of these welding processes, some drawbacks can be attributed to him, for example, the need in industry for greater productivity. In spite of the existing processes having high productivity, when compared to manual process—Shielded Metal Arc Welding—SMAW, the industrial demand requires more productive processes, especially when they are used in automated welding and/or robot welding, because with the robot usage the weld puddle displacement is more uniform and the welding speed is a lot higher.
Another problem noted by GMAW and FCAW processes is related to permanent deformation of the welded parts, which is a consequence of the high thermal cycle caused by high welding current, which has a direct relation with the wire feed speed, in other words, the higher the wire feed for the higher productivity, the higher the welding current supplied by the source and the higher the permanent deformation on this material.
Given those observations and in order to overcome them it was developed the welding process Gas Metal Arc Welding-Double Cold Wire (GMAW-DCW), the subject of this patent, which is the introduction of two “cold” wires in the atmosphere of an arc generated by the energized wire, this way, the “cold” wires cast with the energized wire together, adding the material deposited in the weld pool.
This new process increases the rate of material deposition, reaching up to 100% more productivity in relation to GMAW and FCAW welding processes, with good levels of arc stability and quality of the welded joint. Different wire diameters can be used, as well as mixing tubular solid wires.
Another advantage observed in this new process is the increase in the reinforcement and the reduction in weld penetration. This fact is characteristic in welding coating, which makes the process promising for application in coating.
The attached figures show the arrangement of the welding process (GMAW-DCW), the patent subject, in which:
According to what the illustrations show in the figures listed above, the welding process system (GMAW-DOW), this patent subject, as
The vertical displacement rod (5), which serves to guide the support of the injector displacement (6), these two sets determine the height of the wires entry in relation to the weld pool, the injector tube bottom (7) can dislocate horizontally to the welding torch, which makes it possible for the injector tube (8) makes a spin perpendicularly to the welding torch, these two movements determine the “cold” wire angle entry in relation to the electrode wire (torch wire) and between the two “cold” wires. The injector tube (8) is a support that receives the conduit (17) that leads the “cold” wire to the contact nozzle of electrolytic copper (9), the brake bolts are used to fasten the movable parts of the device (10).
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Number | Date | Country | Kind |
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BR1020130188689 | Jun 2013 | BR | national |
Filing Document | Filing Date | Country | Kind |
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PCT/BR2014/000211 | 6/26/2014 | WO | 00 |