请教红色部分怎么翻译? The Flux Cored Arc Welding (FCAW) process shall utilize an external shielding gas and is not permitted for the root pass of joints made from one side. FCAW may be used for the root pass of joints made from both sides only if it is completely removed prior to welding from the reverse side. Flux Cored Arc Welding (FCAW) 管状焊丝电弧焊 (FCAW) root pass 根部焊道 external shielding gas 外加保护气体 查看更多2个回答 . 4人已关注