Anticorrosive repaired mouth structure of exempting from in spiral weld pipe

The utility model discloses an anticorrosive repaired mouth structure of exempting from in spiral weld pipe, including two sections welding little flaring steel pipe together, the nonrust steel core pipe of a lesson to the steel pipe fit in suit of welding seam department, and nonrust steel core pipe both ends are setting up an annular groove respectively, coordinates the suit the sealing washer in the annular groove respectively, and it is closed with annular space between the nonrust steel core pipe that the sealing washer will decline the flaring steel pipe, and this annular space is the cylindrical shape space, little flaring steel pipe internal perisporium of welding seam both sides on setting up anticorrosion coating. 本实用新型公开了种螺旋焊管的内防腐免补口结构，包括两节焊接在起的微扩口钢管，焊缝处的钢管内配合套装着节不锈钢芯管，不锈钢芯管两端分别设置着个环形凹槽，环形凹槽内分别配合套装着密封圈，密封圈将微扩口钢管与不锈钢芯管之间的环形空间封闭，该环形空间为圆柱筒形空间，所述的焊缝两侧的微扩口钢管内周壁上设置着防腐涂层。