针对生产中出现的A6N01铝合金焊接裂纹问题进行了相关研究。通过从力学性能(硬度)、低倍及高倍显微组织等方面的分析,认为在A6N01铝合金的焊接过程中,裂纹容易出现的部位为焊缝区和热影响区,热影响区易出现力学性能不合格的缺陷。在此基础上,研究了裂纹的形成机理以及热影响区力学性能降低的原因。 A6N01 aluminum alloy welding cracks occurred in the production of related research. From the mechanical properties (hardness), low magnification and high magnification microstructure analysis, that in the A6N01 aluminum alloy welding process, the cracks appear easily weld area and heat affected zone, heat-affected zone prone to mechanics Defective performance defects. On this basis, the formation mechanism of cracks and the reason of the decrease of mechanical properties in heat-affected zone were studied.