CAJ | 학술논문

用交流钨极氩弧焊（TIG）对7 mm厚AZ31镁合金板材进行了焊接试验；对焊接接头进行了深冷处理试验，深冷处理温度为-160℃，保温时间分别为4、8和12 h；对深冷处理前后的AZ31镁合金焊接接头进行了拉伸试验，测试了AZ31镁合金TIG焊接接头的强度；用扫描电镜SEM观测了拉伸试件断口形貌；测试了AZ31镁合金TIG焊接接头的硬度分布。试验结果表明，在深冷处理温度为-160℃、保温时间为8 h的情况下，深冷处理后镁合金焊接接头的各项力学性能均达到了最佳状态。
용교류오겁아호한（TIG）대7 mm후AZ31미합금판재진행료한접시험；대한접접두진행료심랭처리시험，심랭처리온도위-160℃，보온시간분별위4、8화12 h；대심랭처리전후적AZ31미합금한접접두진행료랍신시험，측시료AZ31미합금TIG한접접두적강도；용소묘전경SEM관측료랍신시건단구형모；측시료AZ31미합금TIG한접접두적경도분포。시험결과표명，재심랭처리온도위-160℃、보온시간위8 h적정황하，심랭처리후미합금한접접두적각항역학성능균체도료최가상태。
AZ31 magnesium alloy (7 mm in thickness)is welded by TIG with alternating current.The deep cryogenic treatment experiment of joint welded by TIG is carried out.The temperature of cryogenic treatment is set to -160 ℃,and holding times are set to 4,8 and 12 h,respectively.The tensile tests of cryogenic treatment joints of AZ31 magnesium alloy welded by TIG are carried out.The morphology of tensile fracture is analyzed by scanning electron microscopy (SEM),and the hardness of joints welded by TIG is tested.Experimental results indicated that when cryogenic temperature of-160℃and holding time of 8 h,the mechanical property of magnesium alloy welded joints achieve the best condition.