Study on Pulsed Laser Welding of 304 Stainless Steel and Aluminum Matrix Composites
In this paper, 304 stainless steel and aluminum matrix composites were welded by pulsed laser welding technology, and a good welded joint was obtained. The effect of the addition of copper on the microstructure, and stress of the welded joint was also discussed. The optimum weld forming welding parameters are as follows, the laser power is of 5.7 kW, laser frequency is of 4 Hz and welding speed is of 1.2 mm/s. The factors influencing the weld formation are laser power, laser frequency, and welding speed. The mechanism of interface reaction layer was investigated. (Fe7Cu)Al8 was formed by the reaction of Cu with Fe and Al during the welding process. Cu element could increase the fluidity of the molten pool and make the composition symmetrical inside the molten pool. According to the simulation results, the welding stress can reach 600 MPa with copper in the lap joints, while the welding stress is more than 750 MPa without copper. Some parameters such as bulk modulus (B), modulus of rigidity (G), modulus of elasticity (E), C11–C12, Poisson's ratio (ν) were calculated. The plastic of (Fe7Cu)Al8 was better than that of FeAl. The results of calculation and simulation show that the presence of copper can significantly reduce the stress of the lap joint.
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Document Type: Research Article
Publication date: April 1, 2019
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