Welded steel pipes are steel pipes with visible seams on their surface, created by bending and shaping steel strips or plates into circular, square, or other forms and then welding them. Here is an overview of the repair welding process for welded steel pipes.
Shift Handover:
When taking over a shift, review the handover record to understand the production status of the previous shift and address any unresolved issues immediately.
Equipment Check:
Ensure that the grinding wheel and repair welding machine are operating correctly without any load.
Defect Assessment:
Based on the type, location, and size of defects marked on the steel pipe, determine whether grinding or repair welding is necessary and select the appropriate welding method for the repair.
Process Discipline:
Strictly adhere to process protocols and do not deviate from established procedures. If the process documents do not meet production needs, report this to the supervisor promptly. Process parameters can only be adjusted after receiving official change notices, and all adjustments must comply with the updated documentation.
Defect Repair Procedures:
Surface Defects: Clean the welding slag from surface defects before proceeding with welding.
Internal Defects: Use the carbon arc gouging method to clean internal defects. Ensure the gouging is stable and precise, and the resulting groove is even and smooth.
Pipe Diameter Consideration:
For pipes with a nominal diameter (D) of 426 mm or larger, internal defects should be removed and repaired from the inside. For pipes with a diameter of 426 mm or smaller, internal defects can be removed from the outside and repaired by welding from the outside.
Post-Repair Grinding:
Grind the weld after repair welding, ensuring that the remaining wall thickness after grinding falls within the specified tolerance range.
Final Inspection:
Before moving to the next process, thoroughly inspect the welded steel pipe for any missed repairs or defects. Proceed only after confirming there are no errors.
Handling Abnormalities:
Address any abnormal situations during production promptly. If a problem cannot be resolved during the shift, report it to the supervisor immediately and keep detailed records. For operating issues, first verify the correctness of the process data. If any changes are needed, make timely adjustments. Remove any debris attached to the roller surface (such as welding burrs or iron cuttings) promptly and inspect the stress and wear of all small rollers, adjusting or replacing them as necessary.
United Steel Industry As the most important steel pipe manufacturer and exporter in China, in the past 20 years, we have completed more than 100 projects, with partners in more than 100 countries, and established relationships with oil and gas and EPC companies in many countries business relationship.
For more information about the product price, catalog and rolling mill inspection certificate,
please consult:Email:Sales@usisteels.com
