Straight seam steel pipe - straight seam high-frequency welded steel pipe production process The high-frequency welding process of straight seam steel pipe is completed in high-frequency welded pipe unit high-frequency welded pipe unit is usually formed by roll forming, high frequency welding, extrusion, cooling, set Diameter, flying saw cutting and other components. The rear end of the unit is equipped with a steel pipe overturning frame; the electrical part is mainly composed of a high frequency generator, a DC excitation generator and an instrument automatic control device.
1. Straight seam high-frequency welded steel pipe production process The straight seam steel pipe is a high-frequency welding unit that rolls a certain length of strip into a round tube and welds it through a straight seam. The shape of the steel pipe may be round or square or shaped depending on the sizing rolling after welding. The data of welded steel pipes are mainly low-carbon steels and low-alloy steels or other steels with σ s ≤ 300N/mm 2 σ s ≤ 500N/mm 2 .
The production process for high-frequency welding of straight seam steel pipe is as follows: the steel at the edge of the weld seam is locally heated to the molten state.
2. High-frequency welding is based on the principle of electromagnetic induction and the skin effect, proximity effect, and eddy current thermal effect of AC charges in conductors. The extrusion of the rollers allows the butt welds to achieve intergranular bonding to achieve the purpose of welding. High-frequency welding is an induction welding (or pressure contact welding) without weld filler, no welding spatter, heat affected zone Narrow, beautiful appearance of welding, good welding mechanical properties, etc., so it is widely used in the production of steel pipe. The high-frequency welding of steel pipes is the use of the skin effect and proximity effect of alternating current. After the steel (strip steel) is rolled and formed into a circular blank with a broken cross section, the inside of the blank is rotated near the center of the induction coil or A set of impeder (magnet bar) impeder forms an electromagnetic induction loop with the opening of the tube blank. Under the effect of skin effect and proximity effect, a strong and concentrated thermal effect is generated at the edge of the opening of the tube blank, so that the edge of the weld is quickly heated to After the temperature required for welding is squeezed by the press roll, the melted metal realizes intergranular bonding and forms a solid butt weld after cooling.
3. High-frequency welded pipe unit
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