Galvanized steel pipe connection method

Groove Connection

1. Cracking of Groove Welds

• Flatten the inner wall weld rib at the pressure groove section of the nozzle to reduce resistance during grooving.
• Ensure the steel pipe and grooving equipment are aligned properly, with both being level.
• Control the grooving speed so that the forming time does not exceed the recommended limit, and apply force evenly and slowly.

2. Fracture of Grooved Steel Pipes

• Flatten the inner wall weld rib on the nozzle's pressure groove section to reduce resistance.
• Align the steel pipe and grooving equipment properly, ensuring they are both level.
• Regulate the grooving speed to stay within the specified limits and apply even, gradual pressure.
• Check the width and model of the support and pressure rollers on the grooving machine for any mismatch or biting issues.
• Use a vernier caliper to verify that the groove meets the required specifications.

3. Requirements for Grooves Formed by the Grooving Machine

• The surface from the pipe end to the groove should be smooth without unevenness or rolling marks.
• The groove center must be concentric with the pipe wall, and the groove width and depth should meet the required standards. Ensure the clamp model is correct.
• Apply lubricant to the rubber sealing ring and inspect it for damage. Avoid using oil-based lubricants.

Welded Connection

• If the galvanized steel pipe ends are not aligned straight after butt joint, leading to an angled cut, it is recommended to trim a small portion of the pipe before processing.
• If the connected pipes are not tightly joined, resulting in uneven thickness at the weld, or if the pipe becomes oval due to internal reasons or transportation impacts, it’s advised to cut off a small section and reprocess.
• After connecting the nozzle, blisters may appear. This can be caused by technical issues during welding.
• A zinc buildup (zinc tumor) at the nozzle can cause welding difficulties and skin irritation. For large zinc tumors or excessive numbers, simple removal treatment is recommended.

Threaded Connection

• If the thread is randomly buckled, meaning the pipe and threaded fitting are not fully engaged and become loose, cut off the affected part and re-thread the installation.
• If the steel pipe thread and the pipe hoop thread do not match, making it impossible to connect, replace the pipe hoop or adjust the equipment and re-thread.
• If there is missing thread after cutting, check whether the pipe wall thickness meets the standard requirements for threaded connections.

Proper installation and attention to detail are crucial when working with galvanized steel pipes to ensure durability, safety, and performance. Always follow manufacturer guidelines and use the appropriate tools and techniques to avoid common issues like cracks, fractures, and poor connections.

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