交流频率对AM60B压铸镁合金GTAW焊缝气孔的影响  

Effects of AC Frequency on GTAW Weld Porosity of AM60B Die Casting Magnesium Alloy

作　　者：段平安[1] 李阳[1,2] 闫鹏[1] 张恒[1] 游国强[1,3] 

机构地区：[1]重庆大学材料科学与工程学院,重庆400044 [2]东风小康汽车有限公司,重庆400030 [3]重庆大学国家镁合金材料工程技术研究中心,重庆400044

出　　处：《热加工工艺》2017年第15期70-73,78,共5页Hot Working Technology

基　　金：南充市研发资金项目(14A0101)

摘　　要：在50~250 Hz的交流方波电流下,对压铸镁合金AM60B进行了GTAW自熔焊接。焊后用扫描电镜对焊缝截面的气孔分布及形貌进行观察,并用基于Matlab二次开发的图像分析程序识别和计算焊缝气孔率。结果表明:随着方波电流的交流频率增加,焊缝表面的开口型气孔数量和尺寸增加,焊缝表面成形有变差的趋势;焊缝气孔率呈现出先降低后增加的趋势。The die casting magnesium alloy AM60B was welded by GTAW by using square wave AC current of 50- 250 Hz. The distribution and morphologies of pores in the section of welds were observed by SEM and the weld porosity was distinguished and calculated by a secondary developed image analysis program based on Matlab. The results show that with the increase of square wave AC current fi＇equency, the amount and size of open pore on weld surface increase, the weld forming becomes worse, and the weld porosity decreases firstly and then increases.

关 键 词：AM60B 钨极氩弧焊 电流频率 方波电流 气孔率 

分 类 号：TG444.74[金属学及工艺—焊接]