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When it comes to connecting galvanized steel pipes, there are several methods to consider, including threading, welding, and roll grooving. Each method has its own set of challenges and solutions that need to be addressed carefully to ensure a secure and long-lasting connection.
For roll grooving connections, one common issue is cracking at the welds of the rolled grooves. To mitigate this, flatten the inner welding ribs within the pressure groove area of the nozzle to reduce friction during the rolling process. Additionally, align the axis of the steel pipe with the roll grooving equipment and ensure both are perfectly level. Control the grooving speed to avoid exceeding the recommended time, applying force gently and steadily throughout the process.
Another challenge involves fractures in the rolled grooves of the steel pipe. Similar to the previous issue, flattening the welding ribs on the inner wall of the pressure groove part helps decrease resistance. Proper alignment of the steel pipe and the roll grooving equipment is crucial, as is maintaining a consistent and appropriate grooving speed. Inspect the width and compatibility of the support and pressure rollers to prevent any biting issues. Verify the dimensions of the groove using a vernier caliper to ensure they meet specifications. The lubricant used on the rubber sealing rings should never contain oil-based substances.
In terms of welded connections, misaligned pipe ends often lead to uneven welds after butt joints. A practical solution is to trim a small section of the pipe head before welding. Similarly, if the welded joint shows uneven thickness or the pipe becomes oval due to manufacturing or transportation issues, trimming and reprocessing the pipe is advisable. Bubbles at the nozzle post-welding could stem from technical flaws during the welding process. Zinc tumors at the nozzle can complicate welding and cause porosity. Address these by removing excessive zinc buildup, especially when it’s too large or occurs frequently.
Regarding threaded connections, random buckling of threads can lead to loose fittings where the pipe hoop and threads fail to make full contact. In such cases, remove the affected section and rethread the pipe. If the threads between the steel pipe and the pipe hoop don’t match, replace the pipe hoop or adjust the threading equipment accordingly. Missing thread prints after threading may indicate that the steel pipe's wall thickness doesn't meet the required standards. Always double-check the wall thickness to ensure compliance.
Each method requires attention to detail and adherence to best practices to ensure reliable connections. Proper maintenance and regular inspections of equipment play a vital role in preventing future complications. These considerations help guarantee that galvanized steel pipe connections remain strong and durable over time.