Galvanized steel pipe rolling groove connection

(1) Cracking of groove weld seam
1. Grind the inner wall welding ribs of the groove pressing part of the pipe mouth flat to reduce the rolling groove resistance.
2. Adjust the axis of the steel pipe and rolling groove equipment, and ensure that the steel pipe and rolling groove equipment are level.
3. Adjust the groove pressing speed and ensure that the molding time does not exceed the specified time. Apply force evenly and slowly.
(2) Rolling groove steel pipe fracture
1. Grind the welding ribs on the inner wall of the groove of the steel pipe mouth to reduce the rolling resistance.
2. Adjust the axis of the steel pipe and rolling groove equipment to ensure that they are level.
3. Adjust the groove pressing speed, and the groove pressing speed should not exceed the specified value. Apply force evenly and slowly.
4. Check the width and model of the support roller and pressure roller of the rolling groove equipment to see if there is any mismatch in size between the two rollers, resulting in biting.
5. Use a vernier caliper to check if the grooves of the steel pipe are specified.
(3) The grooves formed by the groove rolling machine should meet the following requirements
1. The surface of the section from the pipe end to the groove should be flat, without bumps or rolling marks.
2. The center of the groove should be concentric with the pipe wall, the width and depth of the groove should meet the requirements, and the model of the clamp should be checked for correctness.
3. Apply lubricant to the rubber sealing ring and check if there is any damage to the rubber sealing ring. Oil lubricant should not be used.