通过金相分析、力学性能测试以及断口扫描等方法研究药皮组分对FV520（B）焊接接头组织与力学性能的影响。结果表明：碱性焊条焊接的焊缝组织以过时效马氏体为主，基体上弥散析出沉淀相，少量沉淀相颗粒开始聚集球化，接头塑韧性较好，强度较高；而酸性焊条焊接的焊缝组织出现黑白分明的两种区域性组织，部分组织保持马氏体形貌，基体上可见较多析出相，聚集球化明显，而且相对碱性焊条的接头性能，酸性焊条的接头综合力学性能较差。另外，药皮组分中合金元素的添加可以有效地提高接头的塑韧性，但是接头强度会有所降低。
The microstructure analysis,mechanical property test and fracture scanning tests were used to study the effect of coating formula on microstructure and properties of welded joint. The results show that the welded microstructure by alkaline electrode is mainly composed of overaging martensite,precipitation phase precipitates dispersively on substrate and a small amount of precipitation phase begins to aggregate and spheroidize. The alkaline welded joint has good toughness and high strength. The welded microstructure by acid electrode is regional structure in black and white,and part of the structure keeps the shape of martensite. More precipitated phase is visible on the matrix and the precipitated phase aggregates and spheroidizes apparently. Compared with the alkaline welded joint,the comprehensive mechanical performance of acid welded joint is relatively poor. The addition of alloy element in coating component can improve the toughness and ductility of welded joint,but the strength of joint will be reduced.
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