Technology of laser welding

Application: the welding of metals with the same composition or different one, butt welding metal sheets to a sufficiently large thickness in a single pass, welding in hard to reach places and different po­sitions.

Advantages: due to the high crystallization rate the different properties of the weld metal and heat affected zone can be attained; in many cases the mechanical properties of the weld metal are not inferior to those of the base metal, and sometimes higher. The use of laser beam for implementation of the weld­ing process provides good handling and flexibility of the process, the possibility of complete automation and the possibility of transporting the laser radiation from the source at a considerable distance, and for fiber lasers – through optical fiber. The process is characterized with ecological purity due to absence of flux and other welding materials.

Key features: depending on laser power and thickness of the welded material welding speed can reach 3–5 m/min, and for the use of laser-arc (hybrid) technology can reach up to 30 m/min. Under opti­mal conditions the effect of the «dagger of penetration» is realized when the depth of weld is bigger of more than 10 times its width. In this case small width of the heat affected zone and low deformation are provided, approximately 3–5 times lower compared to arc welding.

Developed: Research Laboratory «Plasma and Laser Technologies», Prof. Dr. Devoino O.G. D.Sc. (Doc­tor of Techn. Sci.).

Tel.: +375 17 331 00 45, fax: +375 17 331 00 45, e-mail: scvdmed@bntu.by.