External nozzle twin-wire co-pool narrow-gap GMAW torch

Abstract

The invention discloses an external nozzle twin-wire co-pool narrow-gap GMAW (gas metal arc welding) torch, belongs to the technical field of welding, and solves the problems that the conventional twin-wire narrow-gap GMAW torch is complex in structure and poor in welding protection effect. The external nozzle twin-wire co-pool narrow-gap GMAW torch comprises a main welding torch body, two conducting rods, two current contact nozzles, and dual gas sieve plates and gas plugs, wherein the main welding torch body is formed by integrating an upper cover, a gun pipe body and a nozzle into a whole through threaded connection; the gas plugs with holes formed in the radial direction are inserted into the gas inlets of the upper cover; the gas sieve plates with a parallel interval are arranged in the gun pipe body; the guiding rods are inserted into an insulating sleeve; the current contact nozzles are connected to the lower ends of the guiding rods. The external nozzle twin-wire co-pool narrow-gap GMAW torch has the advantages that the holes are punched in the side walls of the gas plugs in the gas inlets, so as to reduce the gas velocity; in the section of gas guiding, the dual gas sieve plates are adopted for further reducing the gas velocity and uniformly mixing gas; both the current contact nozzles point to narrow-gap side walls, so as to promote fusion of the side walls; in the welding process, the nozzle is arranged above a narrow-gap groove, so as to achieve an excellent narrow-gap twin-wire GMAW technology in the state of a common welding pool.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a welding gun for double-wire narrow-gap MIG shielded welding. Background technique [0002] In recent years, with the continuous development of industrial technology, welded structures tend to be large-scale, so the application of thick plates is becoming more and more extensive, and the performance requirements of welded joints are also getting higher and higher. Traditional thick plate welding generally requires a large groove on the workpiece, and multi-layer multi-pass welding is used, which consumes a lot of welding consumables, high heat input, and will cause a certain degree of damage to the plasticity and toughness of the material. Compared with it, narrow The gap welding technology has obvious advantages in welding thick plates. The smaller groove size reduces the amount of weld metal filling and reduces the cost. The fast molten pool solidification speed a...

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Problems solved by technology

[0003] The purpose of the present invention is to solve the problem that the existing GMAW welding torch enters the gas into the groove easily to form turbulent flow, cannot form a g...

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