电磁作用对镁合金焊缝金属组织性能的影响

将纵向交流磁场应用于5mm厚的AZ31镁板GTAW焊接过程中，通过对焊接接头力学性能和显微组织的分析试验，找到了磁场参数对AZ31焊接接头组织和性能的影响规律，并对磁场作用机理进行了分析研究.结果表明，外加纵向磁场的电磁搅拌作用从 4个方面影响晶粒的形核及长大过程，使焊缝中晶粒组织得到细化，进而使焊接接头的抗拉强度和硬度等性能得到改善，同时磁场的电磁搅拌作用可以净化熔池中液态镁合金(使杂质球化并弥散分布)，促进气泡上浮，降低镁合金焊缝气孔及焊接热裂纹敏感性，抑制热裂纹及气孔的产生.

Effect of electromagetic field on microstructures and properties of magnesium alloy of wecd meter

The lognitudinal AC magnetic field was employed for gas tungsten arc welding(GTAW) of AZ31 magnesium alloy plate with a thickness of 5 mm.The effect of magnetic field parameters on microstructures and properties of the AZ31 welded joint was studied throungh detecting and analyzing the tensile strength,hardness and microstruture.The action mechanism of magnetic field was explored.The results indicate that the stirring action of the lognitudinal AC magnetic field on the molten pool affects the nucleation and ...