Intorduction of air hole weld defect in Skelp connection Weiding of HF welded Steel Pipe Mill, analysis of the cause of formation, and bring forward means of troubleshooting.是什么意思_Intorduction of air hole weld defect in Skelp connection Weiding of HF welded Steel Pipe Mill, analysis of the cause of formation, and bring forward means of troubleshooting.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句