Back face protection device facilitating guide pipe welding line back face forming

Abstract

The invention discloses a back protection device facilitating guide pipe welding line back face forming. The back protection device comprises bulging plugs, connecting pipes and a pressure meter. Oneend of a guide pipe is connected with an air bottle through the corresponding bulging plug and the corresponding connecting pipe, the other end of the guide pipe is connected with the pressure meter through the corresponding bulging plug and the corresponding connecting pipe, and the connecting pipe at one end of the pressure meter is provided with a small hole for prevention of sealing-state welding. Each bulging plug comprises a core diameter screw, a bulging sealing ring and a lock nut, wherein the bulging sealing ring is pressed through the lock nut, the bulging sealing ring is deformed and bulged to be attached to the inner wall of the guide pipe, and accordingly the guide pipe is sealed. Through the provided device, guide pipe welding line back face forming is good, the metal brightcolor is shown, oxidization is avoided, excessive welding leakage is prevented, the later guide pipe inner wall grinding work of the guide pipe is reduced, and the guide pipe inner wall quality is improved.

Description

technical field [0001] The invention relates to conduit welding, in particular to a conduit welding backside protection device and a backside protection device that facilitates the formation of the backside of the welding seam. Background technique [0002] At present, conduits are generally formed by welding straight pipes to joints after bending, and there are certain requirements for the appearance quality of conduit welds and the passing diameter. The appearance quality of the weld seam is an important factor for evaluating the quality and grade of the weld seam. The weld seam is bright in metal color, which is a necessary condition for the weld seam to meet the grade I weld seam. The appearance quality of the weld includes the appearance of the outer surface and the appearance of the back surface, and the appearance quality of the back surface depends largely on the back protection. Before the conduit is formed, there is no nozzle or pipe joint at the end, and it can...

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Problems solved by technology

[0003] The problem solved by the present invention is to solve the problem of fast and reliable sealing connection between the jointless conduit and the gas cylinder; to solve the problem of uniform weld seam and effective back protection of the conduit; to solve the problem of weld leakage control in the existing method; in order to solve the above problems, the present invention Back protector that provides strong weld backside formation

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