Welded steel pipe is bent with steel or steel plate is round, square and other shapes and then welded into the surface of the seam with the steel pipe. Common types of welded steel pipe are the following:

General pipe, used to transport low-pressure fluid, easy to weld the other soft steel manufacturing. Steel pipe to pipe and thick steel pipe specifications with the nominal mouth of the water pressure, bending, flattening and other experiments, the surface quality has certain requirements, usually the length of the delivery of 4-10m is actually different, the pipe according to the provisions of the wall thickness Two kinds of steel, according to the thread and no thread two.

Roller, for belt conveyor roller welding steel pipe, the general water pressure and flattening test.

Metric welded pipe, specifications with a seamless tube form, with ordinary carbon steel, high quality carbon steel or Cape can be low-alloy steel tropical, cold belt welding, or with a tropical welding and then made by cold dial method.

Spiral welded pipe, is the low carbon carbon steel strip according to a structural steel or low alloy structure of the helix angle (called forming angle) rolled into a tube, and then welded together made of pipe, strip production of large diameter Of the steel pipe. Spiral welded pipe is mainly used for oil and natural gas pipeline, spiral welded pipe with single-sided welding and double-sided welding, welded pipe should ensure that water pressure test, weld tensile strength and cold bending performance to meet the requirements.

Metric pipe is divided into ordinary and thin wall, commonly used as structural parts, such as transmission shaft, or conveying fluid, thin wall used to produce furniture, lamps, etc., to ensure the strength of steel and bending test.