Straight welded steel pipe is a common steel pipe product, widely used in construction, bridges, machinery, petroleum, chemical, and other fields. Its production technology mainly includes steel plate pretreatment, steel plate forming, welding, straightening, cutting, testing, and other links. The production technology of straight welded steel pipe will be introduced in detail below.

1. Steel plate pretreatment

Steel plate pretreatment is the first step in the production of straight welded steel pipe. Its purpose is to remove scale, rust, oil and other impurities on the surface of the steel plate to ensure the cleanliness and smoothness of the steel plate surface. Common steel plate pretreatment methods include pickling, sandblasting, mechanical cleaning, etc. Among them, pickling is the most commonly used method. Its principle is to use an acidic solution to dissolve impurities such as scale and rust on the surface of the steel plate, and then rinse it with water.

2. Steel plate forming

Steel plate forming is the second step in the production of straight welded steel pipe. Its purpose is to form the pretreated steel plate into a tubular shape according to a certain size and shape. Common steel sheet forming methods include cold roll forming and hot rolling forming. Among them, cold roll forming is bending and pressing the steel plate multiple times to make it into a tubular shape of a certain size and shape; hot rolling forming is heating the steel plate to a certain temperature and rolling it into a tubular shape.

3. Welding

Welding is the core link of straight welded steel pipe production, and its purpose is to weld the formed steel plate into a certain length of steel pipe. Common welding methods include high-frequency welding and submerged arc welding. Among them, high-frequency welding is to heat the steel plate through high-frequency current after forming, so that it can be welded into a tubular shape under a certain pressure; tubular.

4. Straightening

Straightening is an important link in the production of straight welded steel pipe. Its purpose is to correct the welded steel pipe to meet certain straightness and roundness requirements. Common alignment methods include cold alignment and hot alignment. Among them, cold straightening is to straighten the welded steel pipe by rolling; hot straightening is to heat the welded steel pipe to a certain temperature and then straighten it by rolling.

5. Cutting

Cutting is the last step in the production of straight welded steel pipe. Its purpose is to cut the straightened steel pipe according to a certain length. Commonly used cutting methods include oxygen cutting, plasma cutting, sawing, and so on. Among them, oxygen cutting is to heat the surface of steel pipe to a certain temperature, and then use oxygen to cut; plasma cutting is to use a plasma arc to cut; sawing is to use a saw blade to cut.

6. Detection

Inspection is a necessary link in the production of straight welded steel pipe. Its purpose is to inspect the quality of the produced steel pipe to ensure that its quality meets the requirements of the standard. Commonly used testing methods include dimensional testing, visual inspection, chemical composition analysis, mechanical performance testing, etc. Among them, the size inspection is to detect the outer diameter, wall thickness, length, and other dimensions of the steel pipe; the appearance inspection is to inspect the defects and cracks on the surface of the steel pipe; the chemical composition analysis is to analyze the chemical composition of the steel pipe; the mechanical performance test is Test the tensile strength, yield strength and impact toughness of steel pipes.

To sum up, the production technology of straight welded steel pipe includes steel plate pretreatment, steel plate forming, welding, straightening, cutting, testing, and other links. These links cooperate with each other to complete the production process of straight welded steel pipe. In the production process, the quality of each link needs to be strictly controlled to ensure that the quality of the produced steel pipes meets the standard requirements.

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