摘要:采用添加质量分数分别为0,4%,8%,12%,16%,20%MnO的SJ612焊剂,配合SAWER308焊丝焊接了18-8不锈钢,研究了MnO含量对焊接接头显微组织、拉伸性能和耐腐蚀性能的影响。结果表明:接头焊缝组织均由奥氏体和铁素体组成,铁素体含量随MnO含量的增加先增大后减少;随着MnO含量的增加,接头的抗拉强度和伸长率先快速增大后增大速率减缓,当MnO质量分数超过12%时趋向稳定;耐腐蚀性能则先增强后减弱,当MnO质量分数为12%时,接头的腐蚀速率最小,为1.86×10^-5 g·mm^-2·h^-1,耐腐蚀性能最好。
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