Roll groove connection of galvanized steel pipe

(A) rolling groove weld cracking

 1, will be the mouth of the pressure groove part of the inner wall of the weld rib grinding, reduce the rolling groove resistance.

 2, adjust the axis of the steel pipe and rolling groove equipment, and require the steel pipe and rolling groove equipment level.

 3, adjust the pressure groove speed, pressure groove molding length can not exceed the provisions of the uniform, slow application of force.

(B) rolling groove steel pipe fracture

 1、Flatten the welding rib on the inner wall of the grooving part of the steel pipe opening to reduce the resistance of grooving.

 2, adjust the axis of the steel pipe and rolling groove equipment, requiring the steel pipe and rolling groove equipment level.

 3, adjust the groove speed, groove speed can not exceed the specified, uniform, slow application of force.

 4、Check the width and type of the support roller and pressure roller of the grooving equipment, whether there is a mismatch between the size of the two rollers and the phenomenon of biting.

 5, with vernier calipers to check whether the groove of the steel pipe is specified.

(C) rolling groove machine rolling molding groove should meet the following requirements

 1, the pipe end to the groove section of the surface should be flat without bumps, no roll marks.

 2, groove center should be concentric with the pipe wall, groove width, depth should meet the requirements, and check whether the clamp type is correct.

 3、Apply lubricant on the rubber sealing ring and check whether there is any damage to the rubber sealing ring, the lubricant shall not use oil lubricant.