Different Welding Methods For Welding Steel Pipes

Galvanized welded steel pipe supplier china introduces you:

Welded steel pipe refers to a steel pipe or steel plate that is bent and deformed into a round, square, and other shapes and then welded.

The billet used for weld steel pipe is steel or strip.

According to different welding methods, it can be divided into arc welded pipes, high frequency or low frequency resistance welded pipes, gas welded pipes, furnace welded pipes, and Bondi pipes.

Welded steel pipe: used in oil drilling and machinery manufacturing.

Furnace welded pipe: It can be used as water gas pipe, etc., large diameter straight seam welded pipe is used for high pressure oil and gas transportation, etc. Spiral welded pipe is used for oil and gas transportation, pipe pile, bridge pier, etc.

According to the shape of the weld, it can be divided into straight seam welded pipe and spiral welded pipe.

Straight seam welded pipe: Simple production process, high production efficiency, low cost and rapid development.

Spiral welded pipe: Generally higher strength than straight seam welded pipe. Welding pipe with larger diameter can be produced with narrower blanks. Welded pipes with different diameters can also be produced with blanks of the same width. However, compared with straight seam pipes of the same length, the weld seam length is increased by 30 to 100%, and the production speed is lower. Therefore, the smaller-diameter welded pipes are mostly straight seam welded, and the large-diameter welded pipes are mostly spiral welded.

Spiral seam welded steel pipes are divided into automatic submerged arc welded steel pipes and high frequency welded steel pipes.

a. Spiral straight seam welded pipe automatic submerged arc welded steel pipe is divided into two types of pipe A and B according to the pressure of the conveying medium. Class A pipes are generally welded with ordinary carbon steel Q235, Q235F and ordinary low alloy structural steel 16Mn, and Class B pipes are welded with steels such as Q235, Q235F, Q195, etc., and are used as low-pressure fluid transport pipes.

b. Spiral seam high frequency welded steel pipe Spiral seam high frequency welded steel pipe, there is no unified product standard, generally made of ordinary carbon steel Q235, Q235F and other steels.

According to the purpose, it is divided into general welded pipe, galvanized welded pipe, oxygen blown welded pipe, wire casing, metric welded pipe, idler pipe, deep well pump pipe, automotive pipe, transformer pipe, welded thin wall pipe, welded shaped pipe and spiral welded pipe

General welded pipe: General welded pipe is used to convey low pressure fluid. Made of Q195A, Q215A, Q235A steel. It can also be made of other soft steels that are easy to weld. Steel pipes are subjected to experiments such as hydraulic pressure, bending, and flattening, and have certain requirements on surface quality. Usually, the length of delivery is 4-10m, and fixed-length (or double-foot) delivery is often required. The specifications of the welded pipe are expressed by the nominal caliber (mm or inch). The nominal caliber is different from the actual. Welded pipe has two types: ordinary steel pipe and thick steel pipe.

galvanized steel pipe: In order to improve the corrosion resistance of steel pipes, general steel pipes (black pipes) are galvanized. Galvanized steel pipe is divided into two types: hot-dip galvanized and electric steel zinc.

Oxygen blown welded pipe: It is used for steelmaking oxygen blown pipe. Generally, small diameter welded steel pipe is used. The specifications range from 3/8 inch to 2 inch. Made of 08, 10, 15, 20 or Q195-Q235 steel strip. To prevent corrosion, some are aluminized.

Weld Steel Pipe