Galvanized steel pipe connection methods include threading and welding. Another common method is the grooving connection, which involves several critical steps to ensure a secure and durable joint.

Grooving Connection

1. Cracking of Groove Welds

  • Flatten the inner wall weld ridge at the pressure groove section of the nozzle to reduce resistance during grooving.
  • Ensure the axis of the steel pipe and the grooving equipment are aligned and level.
  • Adjust the grooving speed so that the forming time does not exceed the specified limit, applying force evenly and slowly.

2. Fracture of Grooved Steel Pipe

  • Flatten the inner wall weld ridge on the pressure groove section of the steel pipe nozzle to reduce resistance.
  • Check the alignment of the steel pipe and the grooving equipment to ensure they are both level.
  • Control the grooving speed within the allowed range and apply even, gradual force.
  • Inspect the width and model of the support roller and pressure roller on the grooving machine to avoid issues caused by mismatched rollers.
  • 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 center of the groove must be concentric with the pipe wall, and the groove's width and depth should meet the standards. Verify that the clamp model is correct.
  • Apply a suitable lubricant to the rubber sealing ring and check for any damage. Avoid using oil-based lubricants.

Welded Connection

  • If the galvanized steel pipe ends are not straight or the pipe has an inclined cut after butt welding, it is recommended to trim a small section before processing.
  • If the two pipes are not tightly connected after welding, resulting in an uneven weld joint, or if the pipe becomes oval due to internal reasons or transportation damage, it’s best to cut off a small part and reprocess.
  • Blisters may appear at the nozzle after welding, often due to technical issues during the process.
  • A zinc tumor may form at the nozzle, causing welding difficulties and other problems. For large or excessive zinc tumors, perform a simple removal treatment before welding.

Threaded Connection

  • If the thread is randomly buckled, leading to incomplete contact between the pipe and the threaded fitting, cut off the affected section and re-thread.
  • If the steel pipe thread and the fitting thread do not match, replace the fitting or adjust the threading equipment and re-thread.
  • If the thread printing is missing, measure the wall thickness of the steel pipe to ensure it meets the standard requirements for threading.

This detailed guide ensures proper installation and long-term performance of galvanized steel pipes, covering various connection methods and common issues that may arise during the process.

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