Abstract The Al5083 alloy was welded by plasma-MIG hybrid welding with optimized parameters of 58A MIG current and 130 A plasma current with speed of 4.75 mm/s. Good appearance with defect-free of the joint was got. Microstructures and corrosion resistance of electrochemical impedance spectroscopy and potentiodynamic polarization of the welds and base metal in a 0.5 M NaCl solution at room temperature were investigated. Combined with simulated equivalent circuit by program, the relationship between microstructures and corrosion resistance was obtained. Plasma-MIG hybrid welded metal with as-cast structure presents a better corrosion resistance than the base metal with rolling structure. Unlike other welding method, the plasma-MIG welding method is helpful for improving the corrosion resistance of Al5083 welding joints.

中文翻译：

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Al5083合金等离子-MIG混合焊缝的组织和耐蚀性

摘要 采用优化参数58A MIG电流和130 A等离子电流，速度为4.75 mm/s，采用等离子-MIG复合焊方法焊接Al5083合金。外观良好，接头无缺陷。研究了焊缝和母材在室温下 0.5 M NaCl 溶液中的电化学阻抗谱的微观结构和耐腐蚀性能和动电位极化。结合程序模拟等效电路，得到显微组织与耐蚀性的关系。具有铸态结构的等离子-MIG 混合焊接金属比具有轧制结构的母材具有更好的耐腐蚀性。与其他焊接方法不同，等离子-MIG 焊接方法有助于提高Al5083 焊接接头的耐腐蚀性能。