7A52铝合金水蒸气等离子弧焊接头组织及性能
Microstructures and properties of 7A52 aluminum alloy welded joint by vapor plasma arc welding
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摘要: 采用水蒸气等离子电弧技术对10mm厚的7A52铝合金板材进行焊接试验,焊接介质为40%丙酮水溶液,焊丝为ER5356,对焊接接头的力学性能进行了测试分析,对焊接接头的显微组织进行了分析.结果表明,7A52铝合金水蒸气等离子弧焊接头性能较好,焊缝拉伸断口表面存在大量的韧窝,表明焊缝有良好的韧性;热影响区存在软化区域;焊接接头熔合良好,焊缝没有发现异常的气孔、夹渣和裂纹等焊接缺陷.利用水蒸气等离子弧技术焊接7A52铝合金可以得到优良的焊接接头.Abstract: 7A52 aluminum alloy plate of 10 mm was welded by vapor plasma arc welding with ER5356 filler and 40% acetone H2O solution.The mechanical properties and microstructure of the welded joint were studied.The results indicate that the welded joint shows sound mechanical properties.Micrograph analysis shows that the tensile fracture exhibits large quantities of dimples, which indicates good ductility of the weld.There is a softening zone in the HAZ.No abnormal porosity, inclusions and micro-cracks were found in the welded joint.Therefore, vapor plasma arc welding of 7A52 aluminum alloy can obtain excellent welded joint.
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