Saint Petersburg State Polytechnical University, Saint Petersburg, Russia:

Turichin G. A., Professor
Klimova O. G., Assistant, e-mail: o.klimova@ltc.ru
Babkin K. D., Engineer

Specifics of laser welding of such dissimilar materials as aluminum alloys, titanium-based and copper-based alloys are considered in this paper. Using the specialized software LaserCad for welding dissimilar materials, the simulation results of the welding process (using high-fiber power lasers), are given together with following innovations in existing model: infl uence of thermophysical properties of alloys; welding speed; distance from the beam motion line to junction of materials and laser power on formation of temperature fi elds. Microstructure of weld seam for these systems is researched. Chemical composition of diffusion zone is defi ned using scanning electron microscopy. Absence of unacceptable defects in weld seam (large pores, hot cracks) is shown using metallographic analysis. Existence of thin interlayers (less than 3 μm) with variable chemical composition demonstrates absence of continuous intermetallic layers in both systems. Thickness of transition zone composed 15–20 μm for aluminum-titanium system and 15–30 μm for aluminum-copper system. Comparison between calculated data of modifi ed model of weld seam formation and laser welding experimental data of Al – Ti and Al – Cu systems showed good coinciding. Possibility of usage of laser technology for welding of dissimilar materials is demonstrated experimentally. There are shown the preconditions for usage of laser welding of dissimilar materials in aluminum-copper and aluminum-titanium systems in industry.

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