Galvanized steel pipe connection method: thread, welding.
Roll groove connection
(1) Cracking of rolling groove welds
1. Flatten the inner wall welding rib of the pressure groove part of the nozzle to reduce the rolling groove resistance.
2. Adjust the axis of the steel pipe and the rolling groove equipment, and require the steel pipe and the rolling groove equipment to be level.
3. Adjust the grooving speed, the forming time of the grooving cannot exceed the specified time, and apply force evenly and slowly.
(2) Fracture of rolling grooved steel pipe
1. Flatten the welding rib on the inner wall of the pressure groove part of the steel pipe nozzle to reduce the rolling groove resistance.
2. Adjust the axis of the steel pipe and the rolling groove equipment, and require the steel pipe and the rolling groove equipment to be level.
3. Adjust the grooving speed, the grooving speed should not exceed the regulations, and the force should be applied evenly and slowly.
4. Check the width and model of the support roller and the pressure roller of the rolling trough equipment, whether there is a bite phenomenon caused by the mismatch of the two rollers.
5. Use a vernier caliper to check whether the groove of the steel pipe is specified.
(3) The grooves formed by the rolling groove machine should meet the following requirements
1. The surface from the pipe end to the groove section should be smooth without unevenness and 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 check whether the model of the clamp is correct.
3. Apply lubricant on the rubber sealing ring and check whether the rubber sealing ring is damaged. The lubricant must not be oil lubricant.
Welded connection
1. There is a problem that the galvanized steel pipe mouth is not in a straight line and the steel pipe has an inclined mouth after the butt joint. It is recommended to cut off a small section of the pipe head before processing.
2. After the galvanized steel pipe is connected, the two pipes are not connected tightly, resulting in uneven thickness of the welded joint; and the pipe is oval due to its own reasons or transportation bumps. It is recommended to cut off a small section of the pipe head. Process again.
3. After the nozzle of the galvanized steel pipe is connected, there are blisters at the nozzle:
4. Due to technical reasons during welding.
5. There is a zinc tumor at the nozzle, which causes welding difficulties and trachoma problems. Simple zinc tumor removal treatment should be performed for the zinc tumor that is too large and the excessive number of tubes.
wire connection
1. The screw thread is randomly buckled: the pipe hoop and the screw thread cannot be completely contacted and loosened. Cut off the random buckle part and re-thread the installation.
2. The steel pipe thread and the pipe hoop thread do not match and cannot be connected. The pipe hoop should be replaced or the equipment should be adjusted to re-thread.
3. Missing printing after the steel pipe threading: measure whether the wall thickness of the steel pipe can meet the standard thickness requirements of the threading pipe
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