Novel double-wire narrow-gap welding gun

Abstract

The invention relates to a novel double-wire narrow-gap welding gun. The novel double-wire narrow-gap welding gun is characterized by comprising a welding gun body, a preheating gas pipe, a welding flux pipe, a welding gas pipe, a preheating gun and a closed air tap. A contact tube structure is omitted, the lower end of a gun barrel is bent leftwards or rightwards, so that welding wires are in good contact with the gun barrel at an outlet in the lower end of the gun barrel, and the lower end of the gun barrel has the function of the contact tube; a protection box and the gun barrel can move left and right along an insulating plate, and a rectangular moving rod of the gun barrel can move front and back in a long hole of a protection top box; the distance between the lower ends of the two welding wires can be smaller, the distance between the two welding wires is smaller, then the heat efficiency is high, and it is guaranteed that the side walls are fused better; a set of preheating gun is arranged at the front part of the welding gun body in the welding direction and can be accurately aligned with a weld joint part for preheating, so that the preheating effect on the weld joint is achieved, and a large amount of energy is saved; and an air tap cover covers the front, rear, left, right and top parts of the air tap, so that air leakage is avoided, and air holes are effectively avoided.

Description

technical field [0001] The invention relates to the field of welding equipment, in particular to a novel double-wire narrow-gap welding torch. Background technique [0002] The commonly used welding processes for narrow gaps are submerged arc welding and gas shielded welding, and their welding torches have many things in common. The weldment gap during narrow gap welding is between 8-32mm. For welding in such a narrow gap, the new double wire narrow gap welding torch is a very critical part. [0003] The general new twin-wire narrow-gap torches work well, but have some drawbacks: [0004] 1. The welding current is generally around 350A. In order to withstand such a large current, commercially available conductive resistors are connected to the gun shaft with M5, M6, and M8 threads, but the thickness of the gun shaft for narrow gap welding is about 5mm, so it cannot be processed. 5mm thread, therefore, how to connect the contact tip with the gun shaft is very difficult to c...

AI Technical Summary

Problems solved by technology

[0004] 1. The welding current is generally around 350A. In order to withstand such a large current, commercially available conductive resistors are connected to the gun shaft with M5, M6, and M8 threads, but the thickness of the gun shaft for narrow gap welding is about 5mm, so it cannot be processed. 5mm thread, therefore, how to connect the contact tip to the gun shaft is difficult to carry out at the design level

[0005] 2. The general gun shaft and the protective plate are fixed together, so the distance of the welding wire cannot be changed

[0006] 3. In order to ensure the penetration of both sides of the weldment during actual welding, the workpiece needs to be preheated; the commonly used preheating methods are: oxygen-acetylene block heating, resistance band heating; although these heating methods are very practical, but in order to make If the local temperature of the weld rises, the temperature of a large piece of metal around the weld will rise, and there is a waste of energy.

[0007] 4. The size of the front wall and the rear wall of the welding gun is fixed, so there is a large gap between the front wall or the rear wall and the two side walls, so there is air leakage in the front and rear of the gas nozzle; The upper part of the air chamber has no shield, therefore, the upper part of the air nozzle leaks more seriously

Due to severe air leakage, the protection effect is poor, and there are many air holes in the weld seam

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