Laser beam processes welding

In modelling the welding process, an optical model has been used to determine how the laser beam is attenuated in the course of passage. This information has been used as the basic input to a thermal model. 

S. Lathabai, K.J. Barton, D. Harris, P.G. Lloyd, D.M. Viano, and A. McLean, Welding and Weldability of AZ31B by Gas Tungsten Arc and Laser Beam Welding Processes, Magnesium Technology 2003, H.I. Kaplan, Ed., TMS, 2003... 

When the heating phase was analyzed, it was seen that if the part that absorbs the laser beam has a high absorption constant, this process phase can be readily described by a physico-mathematical model, by analogy to single-sided heat impulse welding. A comparison of calculated and measured melt layer thicknesses showed that, by introducing a correction factor, it is possible for this model to be successfully used for the case of a low absorption constant as well. 

The principle behind the laser transmission welding process is shown in Figure 1. If this process is to be applied, then one of the semi-finished products must be transparent to the laser beam and the other material must have a high absorption constant. 

Zaeh MF, Daub R, Mahrle A, Beyer E (2009) Influence of C02 in the Ar process-gas on the heat-conduction mode laser beam welding process with Nd YAG and diode lasers. WLT, Munich... 

The laser beam offers the advantage of precise machining, even in places or on materials that cannot be processed with the conventional welding methods. 

---