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Laser Pressure Welding of Aluminum Alloy and Low Carbon Steel

This paper proposes laser pressure welding technology for joining dissimilar metals. Laser pressure welding of aluminum alloy A6061 and low carbon steel SPCC sheets was carried out by changing the roller pressure. And a YAG laser beam was irradiated on different locations into the wedge of two sheets by a f:θ lens and scanned at various frequencies and patterns using two dimensional scanning mirrors. The tensile shear strength and peel strength of welded joints were measured. The tensile shear and peel test specimens made in Ar gas flows fractured in the A6061 base metal and along welded dissimilar metal interface, respectively. The highest tensile strength and peel strength were obtained at the laser power of 1.8 kW, the laser scanning speed of 30 Hz, the laser irradiation position of centerline, the roller pressured of more than 245 MPa and the welding speed of 0.5 m/min in Ar atmosphere. The interfaces of the joints were analyzed by using SEM and EDX, and the formation phases on the peeled surfaces were analyzed with XRD. It was revealed to be important for the production of a sound joint with high mechanical properties to prevent a welding high temperature part from oxidation.