An assembled ultra-narrow gap mag/mig welding insulating nozzle

Abstract

The invention relates to an assembled ultra-narrow gap MAG / MIG welding insulating nozzle, which comprises a left insulating strip installed on the left side of the conductive tip of the ultra-narrow gap MAG / MIG welding gun body end through a countersunk head screw, respectively installed on the welding gun body Center and right front and rear insulation panels and right insulation strips at the ends. The nozzle of the present invention is improved from a traditional integral type to a 4-piece assembly type, and the cracking failure caused by a large local working temperature difference is greatly reduced, and the working life of the nozzle is greatly improved; the area with the highest temperature rise in the long-term working environment of the nozzle is located at the conductive tip The front and rear insulating plates of the part are designed, manufactured and installed with the allowable free expansion and contraction. When the strong thermal radiation and convection of the arc heat the front and rear insulation during work, the thermal expansion state can be freely elongated without rigid constraints. , On the contrary, it can be freely shortened, which is an important reason for the substantial increase in its working life.

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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