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Galvanized steel pipe connection method
Galvanized steel pipes can be connected using threads, welding, or roll grooving methods. Let’s break down each approach:
**Roll Groove Connection**
One common issue with roll grooved connections is cracking at the welds. To address this:
- Flatten the inner welding ribs in the pressure groove area of the nozzle to minimize resistance.
- Align the steel pipe and the roll grooving equipment properly, ensuring they are level.
- Control the grooving speed carefully, making sure it doesn’t exceed the specified time, and apply force gradually.
Another concern is fractures in roll grooved steel pipes. To prevent this:
- Flatten the inner welding ribs as mentioned earlier.
- Ensure proper alignment between the pipe and the equipment.
- Maintain a controlled grooving speed and apply even force.
- Inspect the support and pressure rollers for proper width and compatibility to avoid misalignment.
- Verify the groove dimensions with a vernier caliper.
The ideal roll grooved pipe should have:
- A smooth transition from the pipe end to the groove section without irregularities or marks.
- A groove centered with the pipe wall, meeting the required width and depth specifications.
- Properly aligned clamps and undamaged rubber seals. Avoid using oil-based lubricants.
**Welded Connection**
A prevalent issue in welded galvanized steel pipes is misaligned pipe ends, leading to poor joint integrity. To solve this:
- Trim a small section of the pipe before welding to ensure straightness.
- Address oval-shaped pipes caused by manufacturing or transport issues by cutting and reprocessing.
Blistering at the nozzle post-welding can occur due to improper technique or zinc buildup. Excessive zinc deposits should be removed to facilitate better welding.
**Thread Connection**
Randomly buckled threads can lead to loose fittings. Remove the affected portion and retread the pipe. Mismatched threads between the pipe and coupling necessitate replacing the coupling or readjusting the threading equipment. Missing print after threading suggests the pipe wall may not meet the required thickness standards, requiring further inspection.
Overall, maintaining precision and care during the assembly process ensures reliable and long-lasting connections for galvanized steel pipes. Regular maintenance and quality checks are essential to prevent complications and extend the lifespan of these connections.