Galvanized steel pipe connection method: threaded, welded.
Rolling groove connection method
（1） Cracking of groove weld seam
1. Grind the welding ribs on the inner wall of the groove pressing part of the pipe mouth flat to reduce the rolling resistance.
2. Adjust the axis of the steel pipe and rolling groove equipment, and require the steel pipe and rolling groove equipment to be level.
3. Adjust the groove pressing speed, the groove forming time should not exceed the specified limit, and apply force evenly and slowly.
（2） Rolling groove steel pipe fracture
1. Grind the welding ribs on the inner wall of the groove section of the steel pipe mouth to reduce rolling resistance.
2. Adjust the axis of the steel pipe and the rolling groove equipment to ensure that they are level.
3. Adjust the groove pressing speed, which should not exceed the specified limit, and 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 causing biting phenomenon.
5. Use a vernier caliper to check if the groove of the steel pipe is specified.
（3） The groove formed by rolling groove machine should meet the following requirements
1. The surface from the pipe end to the groove section should be flat, without any bumps or rolling marks.
2. The center of the groove should be concentric with the pipe wall, and the width and depth of the groove should meet the requirements. Check whether the clamp model is correct.
3. Apply lubricant to the rubber seal ring and check for any damage. Oil lubricant should not be used as lubricant.
Welded connection
1. After the galvanized steel pipe mouth is connected, there is a problem of not being in a straight line and having a diagonal joint with the steel pipe. It is recommended to cut off a small section of the steel pipe head before processing.
2. After the galvanized steel pipe mouth is connected, two pipe mouths are not tightly connected, resulting in uneven thickness of the weld joint; Due to inherent reasons or transportation collisions, the steel pipe may have an elliptical opening. It is recommended to cut off a small section of the steel pipe head before processing.
3. After the galvanized steel pipe mouth is connected, sand holes appear at the mouth of the pipe.
4. Due to technical reasons during welding.
Car wire connection
1. Loosening of threads: The pipe clamp cannot fully contact or loosen the threads. Cut off the loose part and reinstall the threads.
2. The steel pipe thread and the pipe clamp thread do not match and cannot be connected. The pipe clamp should be replaced or the equipment adjusted to re thread.
3. Leakage of printing after steel pipe threading: Measure whether the wall thickness of the steel pipe can meet the standard thickness requirements for threading pipes.
