Welded tube is using the materials, such as steel belt or plate stuff, as the steel pipe joint on the surface, which makes the welded can bend into round or triangle shape. That makes the tube shape. Welded steel pipe is formed in 1.0m for the pipe diameter and more than 10mm thick from the steel plate.

Automatic rolling machine works: capillary wall after piercing is very thick, very uneven surface, with a clear spiral ribs, the need for further processing. Rolling is a major step on the wall reprocessing.

As there is no need to add filler metal during the welding process of HFW steel pipe, it has the advantage of high welding speed and high production efficiency, and it is widely used in oil and gas transport, oil pipelines, structures and various mechanical pipe and other fields.

Welding is a common method in industrial applications, and by heat or pressure, or both, and with or without filler material.

Double submerged arc welded straight seam steel pipe is a new welding method invented in 1940, it is the same place and the front of the manual welding it or slag protection, but this residue is not the electrode coating, but melting out welding flux.

Thick-walled steel pipe mainly used in petroleum geology drilling pipe, petrochemical cracking with tubes, boiler tubes, pipes and automotive bearings, tractors, aviation structures with high precision tubes.

Erw pipe is a kind of welded steel pipe,welding pressure is a major factor, the two edges of the steel tube is heated to welding temperature in the extrusion under pressure to form a common metal that each crystal grain resulting from welding.

Since the 1930s, with the rapid development of high quality of strip steel rolling production and the progress of welding and inspection technology to improve the weld quality constantly, increasing varieties of welded steel pipe specifications.

As known to all that carbon steel pipe contains API steel pipe, black steel pipe ,welded steel pipe,but whether you know the knowledge of ASTM Steel Pipe Standards. Today,we can discuss the problem of ASTM Steel Pipe Standards.

The length of steel pipe exceeds the requirements, the ultra is poor said feet long, superimposed differential said short feet.

General welded pipe is used for transporting low pressure liquid. Use Q195A, Q215A, Q235A steel manufacturing. Also can be used to other mild steel welding manufacturing. Welded steel pipe for pressure, bending, flattening and so on experiment, the surface quality is a certain request, usually the delivery length is from 4 to 10 m, which often required scale delivery of the goods.

High temperature prefabricated buried pipe insulation consists of four parts.