From the manufacturing method of spiral welded pipe and straight seam welded pipe, the technical key lies in forming and welding. Due to the different molding methods, the raw materials used in the two are naturally different. Spiral welded pipe is made by spiral forming of strip steel coil, ERW straight seam welded pipe is also made of hot rolled strip coil by row forming, and UOE straight seam welded pipe is made of steel plate by U and O forming.

The mechanical properties, material uniformity and thickness tolerance of the steel plate are better than those of the steel coil. Therefore, the quality of UOE straight seam welded pipe is inherently better than spiral welded pipe and ERW straight seam welded pipe. In addition, in welding, submerged arc welding is recognized as a high-quality welding method, and the weld has good toughness, plasticity, uniformity and compactness. Although both the spiral welded pipe and the straight seam welded pipe adopt submerged arc welding, the spiral welded pipe is welded on the curved surface, and the welding conditions are poor, and defects such as misalignment, welding deviation and incomplete penetration are prone to occur.

ERW straight seam welded pipe is resistance welding. Due to the influence of welding speed, temperature, extrusion force and other factors, the quality of the weld has always been an important factor affecting its performance. UOE straight seam welded pipe combines the advantages of submerged arc welding and welding under straight seam conditions, while overcoming the shortcomings of both.

High quality rollers are made of material SKD11, with vacumm gas quenching. Hardness reaches up to 64-66, with CNC high precision processing.
Precise CNC processing could ensure the smooth surface with less scratch happenning when forming. Accurate size could controle the tolerance at the range of ±0.5-1.0 mm.
Visible design of micro adjusting device of roller’s lifting, making roller replacement higher operability.

1. Spiral welded pipes can produce large diameter and long pipes, but UOE and ERW straight seam welded pipes cannot.

2. UOE straight seam welded pipe can produce thick-walled pipe, but it is difficult for spiral welded pipe and ERW straight seam welded pipe.

3. There is no pipe expansion process for spiral welded pipes

4. Inspection methods, the three are similar

5. The spiral welded pipe unit is easy to manufacture, less investment, quicker and less productive, while the UOE straight seam welded pipe unit is difficult to manufacture, with large investment and high output

6. The welding seam of the spiral welded pipe is long, and the UOE and ERW straight seam welded pipes are only the length of the pipe.

7. The bearing capacity of spiral welded pipe is lower than that of UOE and ERW straight seam welded pipe

8. The stress condition of the spiral welded pipe is better than that of the UOE and ERW straight seam welded pipes, but the quality of the weld is difficult to control