Renovation and Transformation of Second-hand Welded Pipe Equipment: Key Processes and Quality Control

The refurbishment and transformation of second-hand welded pipe equipment serve as a core method to enhance equipment performance. It can not only repair aging components but also adapt to new production requirements. However, key processes must be strictly controlled to prevent "failures right after refurbishment". Many enterprises neglect critical links, resulting in poor equipment stability after renovation and a rise in operating costs instead.

The primary step of refurbishment is the calibration of the frame and basic structures. Laser inspection equipment is used to locate deformed areas, and thermal correction or mechanical correction technologies are adopted to restore frame precision, ensuring uniform stress on the forming system. Roll system repair acts as a core process. Surface flaw detection is conducted on forming rolls and sizing rolls. Those with excessive wear require surfacing reshaping and precision grinding treatment, and the roll surface hardness must be restored to the HRC 58-62 standard to guarantee pipe forming accuracy.

The upgrading of the electrical system cannot be overlooked. All aging circuits are replaced with high-temperature resistant and flame-retardant cables, and outdated contactors and relays are upgraded to high-quality industrial-grade parts. The PLC control system needs program optimization and compatibility testing to ensure stable signal transmission. For the welding system, the output accuracy of high-frequency power supplies shall be calibrated, aging welding coils and couplers replaced, and load tests implemented to verify welding stability and avoid weld defects.

Quality control must run through the entire process. After transformation, an 8-hour continuous material-carrying trial operation is required to inspect pipe dimensional tolerances, weld strength and equipment operating parameters, with a third-party institution invited to issue inspection reports. Meanwhile, refurbishment files should be established to record the repair and replacement information of each component, providing a basis for subsequent maintenance. Scientific refurbishment and transformation can bring the performance of second-hand equipment close to that of new machines, with costs accounting for only 30% to 40% of new equipment. It stands as an optimal solution for small and medium-sized enterprises to improve quality and efficiency.

For more information, please pay attention to the website of Jinyujie Mechanical and Electrical Used Pipe Mill Supplier：www.usedpipemill.com.