<span><span style、" font-family: 宋体;">电渣焊</span></span>
<span><span style、" font-family: 宋体;">电阻电焊</span></span>
<span><span style、" font-family: 宋体;">气体保护焊</span></span>
<span><span style、" font-family: 宋体;">手工电弧焊</span></span>
<span><span style、" font-family: 宋体;">自动埋弧焊</span></span>