大电流MAG焊焊缝金属的冲击韧性  

Impact Toughness of Weld Metals with High Current MAG Welding

作　　者：包晔峰[1] 蒋永锋[1] 薛猛[1] 阮星谊[2] 

机构地区：[1]河海大学机电工程学院,江苏常州213022 [2]上海宝山钢铁股份有限公司冷轧厂,上海200941

出　　处：《河海大学常州分校学报》2006年第3期50-54,共5页Journal of Hohai University Changzhou

摘　　要：探讨大电流MAG焊焊缝金属的冲击韧性.对在4种不同工艺条件下运用大电流MAG焊得到的焊缝金属进行低温冲击试验.试验结果表明,采用不同的焊接材料和不同的焊接参数,试样的冲击韧性差别较大.通过化学成分分析和光学显微镜观察得出:当焊缝金属的C、Si、Ti含量过大时,会产生脆而粗大的贝氏体组织,韧性较差;当C、Si、Ti含量适中时,焊缝金属中出现细小的针状铁素体,低温冲击韧性很好.Impact tests of four kinds of weld metals with high current MAG welding were carried out at low temperature. As a result, impact values varied with different welding fillers and parameters. With OM and chemical composition analysis, it could be concluded that when the contents of C, Si and Ti were too much in weld metals, the brittle and massive bainitic microstructure formed and impact toughness of weld metals decreased, and when the contents of C, Si and Ti were moderate, the acicular ferrite formed and impact toughness of weld metals improved.

关 键 词：大电流MAG焊 焊缝组织 冲击韧性 

分 类 号：TG407[金属学及工艺—焊接]