FAN Jikang, MA Li, NI Cheng, et al.Microstructure and Mechanical Properties of 5A01 Aluminum Alloy Sheet Joint Welded by Laser Oscillation Welding[J].Electric Welding Machine, 2023, 53(1): 38-43. DOI： 10.7512/j.issn.1001-2303.2023.01.06.
Microstructure and Mechanical Properties of 5A01 Aluminum Alloy Sheet Joint Welded by Laser Oscillation Welding
When aluminum alloy is welded by arc welding process, it is easy to cause coarse grain in the weld zone and produce defects such as pores and cracks. The laser oscillation welding tests of 1.0 mm thick 5A01 aluminum alloy sheet were carried out, and the microstructure and mechanical properties of the joint were studied. The results show that under the condition of surface focusing, when the robot speed is 40 mm/s, laser power is 1 600 W, pulse frequency is 5 000 Hz, swing frequency is 110 Hz, and swing amplitude is 0.5 mm, the joint with good formability can be obtained. It was found that the columnar grains grow mainly along the fusion zone and the weld center is mainly composed of fine equi-axed crystal. The hardness gradually decreases from the base metal zone to the weld zone. The tensile strength of the joint is about 66% of the base metal, and the elongation is about 41% of the base metal. The fracture form of the joint is dimple fracture. The mechanical properties of the joints are significantly reduced, mainly due to the stress concentration easily generated at the porosity and the concentrated energy of laser welding, resulting in uneven heating of the thin plate generating large internal stresses.
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