Gas protection device for inner weld seam of stainless steel laser welded pipe

Abstract

The invention discloses an inside weld gas protection device for a stainless steel laser welded pipe. The inside weld gas protection device comprises a water inlet pipe, a water return pipe, a ventilation pipe and an inside weld gas protection device cavity, and is characterized in that at least more than three installing holes for installing the water inlet pipe, the water return pipe and the ventilation pipe are formed in the inside weld gas protection device cavity; a front sealing plug is arranged on the left part of the inside weld gas protection device cavity; a back sealing plug is arranged on the right part of the inside weld gas protection device cavity. A cooling water pipe is a red copper pipe made of a high-conductivity material, and heat generated on an inside weld (welding spot) is discharged continuously under the action of circular flow of cooling water, so that an air pipe is protected from being broken by melting or blocked, and the requirement of continuous production is met. Meanwhile, a certain gap is formed between the water inlet pipe and the water outlet pipe, so that direct irradiation of laser light is avoided, and the normal service life of the device is ensured.

Description

technical field [0001] The invention relates to the field of inner weld formation of stainless steel laser welded pipes, and specifically designs a gas protection device for inner weld seams of stainless steel laser welded pipes. Background technique [0002] Stainless steel laser welded pipe has the characteristics of fast welding speed, small heat input, narrow heat-affected zone, small welding deformation, and good cold forming performance. It is mainly used in the production of high-end car exhaust systems, especially for European and American car manufacturers to use laser welded pipes. [0003] The existing inner welding seam protection device is composed of a support frame and a ventilation pipe, which is characterized by a simple structure, especially in the area of ​​the laser welding spot, the air pipe is often fused or blocked by the laser, the sealing effect is poor, the degree of oxidation of the inner welding seam is serious, and the To a certain extent, it af...

AI Technical Summary

Problems solved by technology

[0003] The existing inner welding seam protection device is composed of a support frame and a ventilation pipe, which is characterized by a simple structure, especially in the area of ​​the laser welding spot, the air pipe is often fused or blocked by the laser, the sealing effect is poor, the degree of oxidation of the inner welding seam is serious, and the To a certain extent, it affects the quality of the weld seam

In addition, in the process of cutting the long pipe into short pipes, due to the existence of coolant, the surface quality of the inner weld seam is poor, and there is a slight rust phenomenon, which affects the quality of the weld seam to a certain extent

Images