最好看的中文字幕国语电视剧,中文字幕在线播放,浴室情欲2韩国中文字幕,美丽的姑娘在线观看中文版,最好看的2018中文中国国语,狂野少女免费完整版中文,熟妇人妻中文字幕无码老熟妇,维修工人的绝遇中文字

The submerged arc welding machine is used for the drum welding. Ensure accurate welding procedures and welding processes, accurate and stable line energy, eliminate unfused and incomplete penetration, and minimize the occurrence of slag inclusions, pores and cracks. The shape coefficient of the weld is good, the surface of the weld bead is smooth, the pass rate of welding is high, the weld is beautiful, and the welding quality is high.