有关英语组焊的问题!? 个人觉得 backing welding 是背部焊接,例如有的焊接工艺上要求背部焊透并清根,清根为back gouging. 另外,见过的技术文件上写的是 shielding gas 应为保护气体(我理解的为正面保护气体)backing gases 为背面保护气体. 例如:alternative shielding gases may be used with the prior written approval of the contractor.approximate flowrate are normally 0.4-0.7m³/h for both shielding and backing gases. 大家讨论下!查看更多