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Study on Pulsed Laser Welding of 304 Stainless Steel and Aluminum Matrix Composites

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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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Keywords: 304 STAINLESS STEEL; ALUMINUM MATRIX COMPOSITE; DISSIMILAR METAL JOINT; LASER WELDING; SIMULATION

Document Type: Research Article

Publication date: April 1, 2019

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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