AZ31B镁合金TIG-MIG双弧焊接组织分析  

Analysis on Microstructure of TIG-MIG Double Arc Surfacing of AZ31B Alloy

作　　者：平奇文 马国红[1] 胡小武[1] 叶佳[2] 

机构地区：[1]南昌大学机电工程学院,江西南昌330031 [2]肯塔基大学电子透镜中心,美国列克星敦40506

出　　处：《热加工工艺》2015年第3期196-198,共3页Hot Working Technology

基　　金：国家自然科学基金资助项目(61165008);江西省自然科学基金资助项目(20114BAB206004);教育部回国基金(13006199)

摘　　要：研究了2 mm厚的AZ31B镁合金薄板在TIG-MIG双弧堆焊条件下的工艺特点,利用金相显微镜、扫描电镜等对焊接接头显微组织、焊缝相成分等进行了分析。结果表明,焊接接头主要由母材、热影响区、焊缝区组成。在热影响区和焊缝区之间有较明显的熔合区,该区域由熔池边界半熔化状态的部分冷却而成。由于热循环和焊接冶金作用有大量的析出物(Mg17Al12),因此可以推断此处力学性能较差。焊缝区组织较细,有多种金属间化合物析出。The technical characteristics of TIG-MIG double arc surfacing of AZ3 I B alloy plate with the thickness of 2 mm were discussed. The metalloscope and scanning electron microscopy were used to investigate the microstructure and phase composition. The results show that the welded joints constitute of base material,heat affected zone （HAZ）and weld zone.A large number of precipitates （Mg^TAl12）exist in the significant fusion zone which appears between HAZ and weld zone. In weld zone, the fine grains can be obtained, and several kinds ofintermetallic compounds precipate.

关 键 词：焊接接头 AZ31B镁合金 TIG-MIG双弧堆焊 析出相 

分 类 号：TG444.2[金属学及工艺—焊接]