Abstract
The aluminum alloy profile of an automobile fuel tank protector is taken as the research object in this paper, the problem of poor longitudinal weld seam quality is analyzed, and the effect of process parameters on the longitudinal welding quality is studied. The morphology of poor longitudinal weld seam is observed by optical microscopy and scanning electron microscopy. The effects of extrusion speed, extrusion temperature, and billet diameter on the welding quality of the longitudinal weld seam are studied by using K parameters to quantitatively characterize the welding quality. Simulation results show that lower extrusion speed, higher billet temperature and larger billet diameter are beneficial to improve the longitudinal welding quality. The initial extrusion process parameters are adjusted according to the rule of simulation results, and the extrusion test is carried out again. After the adjustment, the longitudinal weld seam quality is obviously improved, which is in accordance with the simulation results.
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