焊材牌号(新旧)

焊丝新旧牌号对照表类别旧牌号新国标牌号新美标牌号哈焊所牌号备注手工电弧焊（SMAW）碳钢及低合金钢焊条J422GB/T5117 E4303无J502GB/T5117 E5003无J507GB/T511