Assembled ultra-narrow gap MAG/MIG welding insulating spray nozzle

Abstract

The invention relates to an assembled ultra-narrow gap MAG / MIG welding insulating spray nozzle which comprises a left insulating strip arranged on the left side of a current contact nozzle at the end of an ultra-narrow gap MAG / MIG welding gun body through a sunk screw, front-rear insulating plates and a right insulating strip, wherein the front-rear insulating plates and the right insulating strip are arranged in the middle and on the right portion of the end of the welding gun body respectively. According to the assembled ultra-narrow gap MAG / MIG welding insulating spray nozzle, the spray nozzle is improved to be of a 4-piece-assembled type from a traditional integral type, cracking, breakage and invalidation caused by large local work temperature difference are greatly lowered, and the service life of the spay nozzle is greatly prolonged; the region, with the highest risen temperature, of the spray nozzle under a long-term working environment is located at the front-rear insulating plates at the current contact nozzle, the allowable free expansion amount of the front-rear insulating plates is given in the design, manufacturing and mounting processes, in work, when the front-rear insulating plates are heated through strong thermal radiation of electric arc and convection current, the insulating spray nozzle extends freely totally without rigid constraint in the thermal expansion state, otherwise the spray nozzle can be shortened freely, so that the service life of the insulating spray nozzle is greatly prolonged.

Description

technical field [0001] The invention belongs to the field of welding technology, in particular to an assembled ultra-narrow gap MAG / MIG welding insulating nozzle. Background technique [0002] MIMA welding method has been used in the industrial field for nearly ninety years since its invention. In order to greatly improve the productivity and production quality of the metal arc welding method, and at the same time greatly reduce its production cost, the use of narrow gap metal arc welding technology is the most effective and efficient technical approach. Since the concept of "narrow gap welding Narrow Gap Welding" was first proposed by the BATTLE Institute of the United States in the early 1960s, the invented narrow gap submerged arc welding and narrow gap hot wire argon arc welding technologies have their own significant advantages. However, the limitations of these two special technologies are also very significant. The former has a large welding heat input, and the mater...

AI Technical Summary

Problems solved by technology

In summary, the above existing technologies have the following significant limitations: 1. Integral multiple protection narrow gap / ultra-narrow gap welding nozzle can solve the problem of high temperature insulation and good metallurgical protection, but the huge heating in the working environment is not enough Uniformity, it is easy to cause the nozzle to crack and fail, and the service life is short; 2. Most of the patents are non-axial air supply, without the uniform flow and restraint effect of the inner wall of the nozzle, it is difficult to achieve both the circumferential thermal compression effect on the arc and the Reliable laminar flow protection in pyrometallurgical zones

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