Manufacturing process of high frequency welded pipe with low inner seam

Abstract

The invention discloses a manufacturing process of a low-inner-weld-seam high-frequency welded pipe. The manufacturing process is characterized by comprising the following steps that edge burrs generated after strip steel is sheared strip-by-strip are opposite to the forming direction of a reelpipe, so that the strip steel strip-by-strip sheared the edge burrs are located outside the reelpipe after reelpipe is formed; the pass of a high-frequency welded pipe unit forming die is adjusted; a knife type roller set is arranged in the assembly line after the reelpipe is formed and before the reelpipe enters high-frequency welding, and a blade guide wheel aligned with a reelpipe forming seam is arranged in the knife type roller set; and a binding roller set is arranged behind the knife type roller set, and then a welding perfect circle roller set is arranged for high-frequency welding. Through multiple technological means such as strip steel direction resetting, mold pass improvement and adjustment, blade guide wheel introduction and binding roller set cooperation, the whole reelpipe forming process is optimized, the reelpipe welding opening angle and the perpendicularity of entering a welding point position are accurately controlled, a steel pipe inner weld seam is aligned and stabilized, the flaring and cup joint precision of a condenser pipe is guaranteed, and the product qualityand the operation efficiency are improved.

Description

technical field [0001] The invention relates to a welded pipe manufacturing technology, in particular to a manufacturing process of a low internal seam high-frequency welded pipe. Background technique [0002] High-frequency straight seam resistance welded steel pipe is a hot-rolled coil formed by a forming machine, using the skin effect and proximity effect of high-frequency current to heat and melt the edge of the tube blank, and pressure welding under the action of the extrusion roller to realize production The product. The high-frequency resistance welded steel pipe is different from the welding process of ordinary welded pipes. The weld seam is formed by melting the base material of the steel strip body, and its mechanical strength is better than that of ordinary welded pipes. It is relatively easy to obtain a smooth appearance, and has the characteristics of high precision, low cost and small weld reinforcement, and is also beneficial to the coating of 3PE anti-corros...

AI Technical Summary

Problems solved by technology

After the burrs are butt-jointed, the inner weld seam of the steel pipe will be flattened or other irregular shapes by the extrusion of the flaring needle during flaring, and it will be attached to the inner wall of the steel pipe. Infiltrate into the gap between the flat inner weld and the inner wall of the tube, resulting in the leakage of the refrigerator refrigerant, which will seriously cause the refrigerator not to cool

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