目前在国内外液压传动中,对于耐中高压的管道在采用无缝钢管管件时,主要是采用焊接式管接头和卡套式管接头两种形式.卡套式管接头对于钢管的外形尺寸要求高,所以绝大多数都采用了焊接式管接头,即在钢管头部焊上管接头接管.但是当钢管弯制成各种复杂的 At present, in the hydraulic transmission at home and abroad, in the use of seamless steel pipe fittings for pipes that are resistant to medium and high pressure, two types of welded pipe joints and snap-on pipe joints are mainly used. The sleeve-type pipe joints are required for the outer dimensions of steel pipes. High, so the vast majority of them use welded pipe joints, that is, pipe joints are welded to the head of the steel pipe. But when the steel pipe is bent into various kinds of complex