Galvanized steel pipe connection methods include threading and welding. Another common method is the grooving connection, which involves forming a groove on the pipe end to allow for a secure mechanical joint. However, several issues may occur during this process.
1. Cracking of Groove Welds
Flatten the internal weld ridge at the pressure groove section of the nozzle to reduce resistance during grooving.
Ensure the steel pipe and grooving equipment are aligned properly, keeping them level during the operation.
Adjust the grooving speed so that the forming time does not exceed the recommended limit, applying even and gradual force throughout the process.
2. Fracture of Grooved Steel Pipes
Again, flatten the internal weld ridge to minimize resistance.
Verify alignment between the steel pipe and the grooving equipment, ensuring they remain level.
Control the grooving speed to stay within the specified limits, maintaining even and steady pressure.
Check the width and model of the support and pressure rollers on the grooving machine. Ensure there is no misalignment or biting caused by mismatched rollers.
Use a vernier caliper to verify that the groove meets the required specifications.
3. Quality Requirements for Grooves Formed by the Grooving Machine
The surface from the pipe end to the groove should be smooth, without any unevenness or rolling marks.
The center of the groove must be concentric with the pipe wall, and the groove width and depth should meet the required standards. Confirm that the correct clamp model is used.
Apply a suitable lubricant to the rubber sealing ring and inspect it for damage. Avoid using oil-based lubricants as they can degrade the seal.
Welded Connection Issues
If the galvanized steel pipe ends are not aligned straight after butt welding, causing an angled cut, it's advisable to trim a small portion of the pipe before reprocessing.
After welding, if the two pipes do not connect tightly, resulting in uneven thickness at the joint or an oval shape due to deformation or transportation damage, consider trimming and reprocessing the pipe ends.
Blisters at the nozzle after welding may occur due to technical issues during the welding process.
Zinc tumors at the nozzle can cause welding difficulties and result in poor weld quality. For large or excessive zinc tumors, perform a simple removal treatment before proceeding with welding.
Threaded Connection Issues
If the threads are randomly buckled and not fully engaged, remove the affected section and re-thread the pipe for proper installation.
If the pipe thread and the fitting thread do not match, replace the fitting or adjust the threading equipment and re-thread the pipe accordingly.
If the threading results in missing threads, check whether the pipe wall thickness meets the standard requirements for threaded connections.
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