engleski

INFLUENCE OF THE WELDING PROCESS ON THE HARDNESS OF THE WELDED JOINT

Laser and TIG welding processes are suitable for welding of thin sheets. Welding of heat-treatable steels causes substantial increase of the hardness in the welded joint area. Laser and TIG welding differ regarding the power density and heat input into the material. High power density in laser welding allows welding with a lower specific heat input compared to TIG welding, thus resulting in very high cooling rates. Butt welds of 2 mm thick heat-treatable steel sheets 25CrMo4 and 42CrMo4 were welded using laser and TIG processes applying different parameters, using argon and helium as shielding gases. Nd:YAG laser was used. The testing was performed on the geometry of the welded joint, the microstructure and the hardness, and a comparison of the results of laser and TIG welding was carried out.

laser; TIG; heat-treatable steel; welding; welded joint; hardness

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