Welding line inner protecting device of stainless steel pipe making machine

Abstract

The invention relates to the technical field of welding, in particular to a welding line inner protecting device of a stainless steel pipe making machine. The device comprises a protecting device body; the protecting device body is provided with inert gas inlets, cooling water inlet guide pipes, cooling water outlet guide pipes, an inert gas acting groove, through holes, a pipe fitting and a horizontal connecting bar; the inert gas inlets, the cooling water inlet guide pipes, the cooling water outlet guide pipes and the through holes, corresponding in position, are respectively arranged in ports of two sides of the protecting device body; even through holes are provided; the same one pipe fitting is connected between two adjacent through holes; the inert gas acting groove is transversely formed in the upper end surface of the protecting device body; the lower end of the protecting device body is connected with the horizontal connecting bar; the horizontal connecting bar is connected with a machine tool; and the cooling water inlet guide pipes are higher than the cooling water outlet guide pipes in position. The device is low in dosage of protective gas, can adapt to the welding line inner protection of steel pipes with different diameters, can achieve a support effect on materials on two sides of welding lines on the inner walls of the steel pipes, prevents deformation, and can quickly reduce the temperature of the inner walls of the welding lines.

Description

Technical field [0001] The welding technical field of the present invention specifically relates to a welding seam protection device of a stainless steel pipe making machine. Background technique [0002] In the process of welding steel pipes, if oxygen is in contact with the weld, the oxidation reaction will result in lower weld quality and affect the performance of the formed pipe. At the same time, the oxidation reaction will also make the weld black and affect the appearance of the finished product. Therefore, it is necessary to use inert gas shielded welding for the inner and outer pipe walls of the welding place. TIG welding of thin stainless steel pipes usually adopts single-sided welding and double-sided forming. The material on both sides of the weld is easily deformed in the direction of the center of the circle, making the welded steel pipe elliptical, and it is difficult to restore the round shape through mold adjustment. Increase the internal pad to prevent deformat...

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Problems solved by technology

[0003] The technical problem solved by the invention is that the existing anti-oxidation protection in the weld adopts the method of adding plastic blocking blocks on the inner wall of the pipe at both ends of the weld. This method can have a certain anti-oxidation function on the weld, but it is universal for steel pipes of different diameter Poor performance; poor protective effect for steel pipes with larger diameters, and greater waste of protective gas

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