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针对LF21铝合金TIG焊接易产生气孔和热裂纹等特点,引入与焊枪同轴的直流外加纵向磁场对LF21铝合金TIG焊接过程进行控制。以外加恒定直流纵向磁场TIG焊为研究对象,通过采用金相分析和硬度分析的方法,研究了纵向磁场TIG焊接LF21铝合金焊缝组织发生变化的规律和原因。结果表明:在适当的磁场强度作用下,焊缝宏观形貌成形美观;焊缝组织获得最佳的细化效果;焊缝中心硬度值大于无磁场强度时的硬度值,并接近于母材硬度值。
Aiming at the characteristics of easy blowhole and hot crack in LF21 aluminum alloy TIG welding, direct current plus longitudinal magnetic field coaxial with welding torch was introduced to control the LF21 aluminum alloy TIG welding process. In addition, a constant DC longitudinal magnetic field TIG welding was taken as the research object. By means of metallographic analysis and hardness analysis, the rules and causes of the change of the microstructure of the LF21 aluminum alloy welded by longitudinal magnetic field TIG welding were studied. The results show that the macroscopic appearance of the weld is good, the microstructure of the weld is optimized, the hardness of the weld is greater than that of the non-magnetic field strength, and close to the hardness of the base metal value.