线能量对AZ31B变形镁合金GTAW焊接接头沉淀相的影响
Effect of Line Energy on the Precipitates in GTAW Welded Joints of AZ31B Magnesium Alloy
刘奇先
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作者单位：山西省晋煤集团金鼎煤机矿业有限责任公司煤机技术工艺部
中文关键字：AZ31B镁合金；GTAW焊接；显微组织；沉淀相
英文关键字：AZ31B magnesium alloy; GTAW welding; Microstructure; Precipitates
中文摘要：本文对2.2 mm厚挤压态镁合金AZ31B板材进行交流GTAW焊研究，线能量分别取45.5 J•mm-1, 52 J•mm-1, 58.5 J•mm-1和 65 J•mm-1。结果表明：随着线能量的增加，焊缝熔化宽度逐渐增加，线能量为65 J•mm-1时，表面成形最佳，焊缝达到熔透状态；焊缝区沉淀相β-Mg17Al12的平均尺寸及所占面积百分比随焊接线能量的增大而增大，当焊接线能量从45.5 J•mm-1增大至 65 J•mm-1时，β-Mg17Al12的平均尺寸从1微米增大为4微米，在焊缝区所占面积百分比由8%增大到30%。
英文摘要：In this study, AZ31B alloy with 2.2 mm thickness was welded by GTA welding. The welding line energy was 45.5 J•mm-1, 52 J•mm-1, 58.5 J•mm-1 and 65 J•mm-1, respectively. The results showed that: the width of welding fusion increased with the welding line energy increase. The best weld surface and penetration were obtained when the welding current was 65 J•mm-1. The average size of precipitates β-Mg17Al12 in weld zone and percentage share of area increased with the increasing of heat input. When the welding heat input increased from the 45.5 J • mm-1 to 65 J • mm-1, the average size of β-Mg17Al12 increased from 1 micron to 4 microns, percentage share area in the welding seam zone increased from 8% to 30%.