The following relates to a device which is used for welding, and to a method for welding and preheating.
During remelting or deposition welding of metallic materials, in particular of brittle materials such as nickel-based superalloys, it is necessary to avoid hot cracking during the solidification process.
In order to avoid this, use is frequently made of preheating which is achieved by means of induction loops. However, this is rather onerous and difficult to adapt for certain regions of complex geometries.
Embodiments of the present invention therefore has an advantage of proposing a system and method which is simpler to carry out and can adapt flexibly to complex geometries.
The advantages of the device and of the method reside in a simplification of the plant technology and a reduction in or elimination of hot cracking.
The figure and the description represent only exemplary embodiments of the invention.
The device 1 has two lasers 4, 7, in particular only two lasers 4, 7.
The first laser 4 is used for preheating while the second laser 7 is used for remelting.
The first laser 4 couples its laser beams 6, in particular via a fiber 5, into an optical system 16 inside which is a collimating lens 13 and a focusing lens 19.
The second laser 7 couples its laser beams 8 via a scanner 10 and via a dichroic mirror 22 into a common laser beam 25 so as to result in a desired temperature radiation. This produces a laser beam 25 onto a surface of a component 28.
Preferably, two laser beams 6, 8 are coupled-in in the optical system 16, wherein the wavelength of the first laser 4 is 800 nm to 1000 nm and the wavelength of the second laser 7 is 1000 nm to 1100 nm.
The first laser 4 contributes to preheating the component 28 and has a Gaussian intensity distribution as shown in
For the remelting process or deposition process, the laser radiation 8 of the second laser 7 is directed away by means of a scanner 10 and, together with the laser beam 25, is guided in a direction 31 over the component 28.
It is thus possible for preheating to take place at almost any point—including in the transition region—between the blade airfoil and the blade platform.
Although the present invention has been disclosed in the form of preferred embodiments and variations thereon, it will be understood that numerous additional modifications and variations could be made thereto without departing from the scope of the invention.
For the sake of clarity, it is to be understood that the use of “a” or “an” throughout this application does not exclude a plurality, and “comprising” does not exclude other steps or elements.
Number | Date | Country | Kind |
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13166606.7 | May 2013 | EP | regional |
This application claims priority to PCT Application No. PCT/EP2014/057396, having a filing date of Apr. 11, 2014, based off of European Application No. 13166606.7, having a filing date of May 6, 2013, the entire contents of which are hereby incorporated by reference.
Filing Document | Filing Date | Country | Kind |
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PCT/EP2014/057396 | 4/11/2014 | WO | 00 |