Key points for selecting second-hand welded pipe units: match product specifications to avoid common misunderstandings

When purchasing second-hand welded pipe units, many companies only focus on the price and ignore the matching of the equipment with their own product specifications, resulting in frequent welding deviations, unstable forming, and excessive pipe diameter deviations after production. Reasonable selection depends not only on the design capabilities of the unit, but also on its own raw material conditions and target pipe range.

First, clarify the pipe diameter and wall thickness range that needs to be produced. Second-hand welded pipe units of different specifications have their own suitable ranges: small-diameter units (such as type 32, type 50) are suitable for producing round pipes and square pipes, with wall thicknesses usually between 1.0-3.0mm; medium-sized units (such as type 76, type 114) can cover wider specifications, taking into account both thin-walled and medium-walled thicknesses; large units are used for thick-walled structural pipes and low-pressure fluid pipes. When purchasing, the minimum and maximum pipe diameter range of the unit should cover its main products. Do not pursue "one machine for multiple purposes" excessively, otherwise it will affect the molding quality and production efficiency.

Secondly, focus on the rigidity of the forming frame and roll configuration. For welded pipes with relatively large wall thickness, the frame strength and roll material are required to be durable enough. When checking the second-hand mobile phone set, you can judge by observing whether there is obvious deformation of the frame and serious wear on the surface of the roller. If you plan to produce square tubes and rectangular tubes, you also need to confirm whether it is equipped with matching forming rollers and sizing rollers, or whether replacement rollers can be easily purchased.

In addition, attention should be paid to the matching ability of the welding section and the forming section. The welding speed of the unit should match the synchronous adjustment range of the forming speed. It is recommended to conduct a short-term trial production with steel strips of actual specifications during trial operation, observe the appearance and burrs of the weld, and confirm whether the welding power is sufficient. In terms of cutting sections, the sizing accuracy of the flying saw also needs to be tested to avoid excessive errors in subsequent pipe cutting lengths, which will lead to an increase in scrap.

Finally, consider the space for subsequent upgrades. Old second-hand mobile phone sets may have problems with backward electrical control. Check in advance whether frequency conversion speed regulation, PLC control or welding seam tracking system can be installed to leave room for future efficiency improvements. Through scientific selection, companies can obtain stable and reliable tube production capabilities with lower investment.

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