Common large diameter welded pipe, more common in industrial and civil building electrical, water supply and drainage, fire and support structure. Because of this pipe, is used in rolling and winding, along this line welding process, welding is widely used in high frequency wave welding process, so traditionally called "high frequency welded pipe". Small diameter pipe, the production process, the technology is relatively simple, easy to control defects. Large diameter welded pipe production, because of its large size, some affected by the processing machinery and technology, will inevitably produce some manufacturing defects, such as: product concentricity, surface smoothness, surface smoothness and the appearance of these indicators, hole, leakage solder, welding defects and other indicators, may exceed the original expected. Moreover, the welding quality index is also a major factor affecting the quality of finished products.

Recently, large diameter welded pipe as the pipe use, generally by the spiral weld process, avoids the defects of longitudinally welded pipe.