Automatic multifunctional narrow-clearance/super-narrow-clearance gas protection welding gun and manufacturing method thereof

Abstract

The invention relates to an automatic multifunctional narrow-clearance / super-narrow-clearance gas protection welding gun and a manufacturing method thereof. The welding gun comprises a plate-type welding gun body; a guide wire channel, a circulating water cooling runner and a secondary protection gas runner are integrated in the welding gun body, a primary protection gas inlet sea, a secondary protection gas inlet seat, a water inlet pipe seat, a water return pipe seat and a welding cable are fixed on the upper part of the welding gun body, the lower part of the welding gun body is fixedly connected with a gas distribution device, and the gas distribution device is fixed on the lower part of the plate-type welding gun body through the body / a spray nozzle connecting component. The method comprises the steps of preparing raw materials, machining relevant parts, embedding and soldering a runner groove cover plate, embedding a ceramic strip, spraying ceramic coating on external parts, etc. The automatic multifunctional narrow-clearance / super-narrow-clearance gas protection welding gun has the advantages of high integration, high-speed guide wire, stability and reliability in electrical conduction and gas conduction, high efficiency in heat radiation, reliability in insulation, long service life, easiness in machining, low cost, good rigidness, integration of single-wire single gun and double-wire double gun, high working efficiency, safety and reliability.

Description

technical field [0001] The invention relates to a multifunctional narrow gap / ultra narrow gap gas shielded welding automatic welding torch and a manufacturing method thereof, which is a multifunctional integrated integral plate type narrow gap / ultra narrow gap gas shielded welding (MAG / MIG) designed and manufactured based on composite processing of plates. ) An automatic welding torch belongs to the field of welding technology. Background technique [0002] With the rapid development of industrial equipment to high capacity, high parameters, and large scale, high reinforcement, thick wall and heavy equipment have become one of the important characteristics of modern equipment manufacturing. This will bring about a multiplied increase in the amount of welding work, which will lead to an increasingly prominent contradiction between the equipment manufacturing cycle and welding productivity. Significantly improving welding productivity has become an urgent requirement for tech...

AI Technical Summary

Problems solved by technology

The above prior art also has the following limitations: 1. It is difficult to change the cross-sectional size and shape of the flow channel arbitrarily due to the thick-walled pipe, there are many brazed joints and complex structures, and the manufacturing cost is high; 2. It is difficult to rotate and bend the contact tip. To reduce the groove assembly gap to an ideal state, the welding torch system is complicated, and the carbon brush scheme for large current conduction requires extremely high conductive reliability technical measures; increase, the slag cleaning is difficult and the probability of slag inclusion defects is increased, and the application of large and thick plates is difficult; 4. The nozzle is located outside the groove. Shielding gas with high flow rate and wide range will bring a lot of gas consumption, and the greater the thickness of the weldment, the more prominent the limitation, and it is very unfavorable for the reduction of welding production costs; Large, the metallurgical protection effect of the welding area is difficult to achieve the ideal state, and the thickness of the welding torch is difficult to reduce to a thinner value; 6. The water cooling structure is located outside the groove. When the thickness of the weldment is large, only the conductive tip is used to transfer heat to the groove External heat dissipation makes it difficult to ensure that the temperature rise of the contact tip is controlled in an ideal state, so this welding torch can only be used in the field of medium and thick plates that do not need the contact tip to fully extend into the groove, followed by the twin-wire eutectic pool, although it can be greatly improved Increase the deposition speed, but the heat input is large, so it is not suitable for welding high-alloy steel and quenched and tempered high-strength steel; 7 is a split interconnection structure, the manufacturing is complicated and the overall rigidity is poor, there is no water cooling system, and it conducts electricity under long working cycles The temperature rise of the nozzle will lead to a decrease in the stability of the welding current; 8 is a split interconnection structure, the overall rigidity is poor, and the air guide structure is difficult to obtain efficient cooling and heat dissipation, and it is difficult to solve the problem of fusion of the side wall under the assembly gap of the wide welding groove; 9 Only involves a cylindrical contact tip and nozzle structure at the working end of the narrow gap welding torch, and does not involve the main structure of the narrow gap gas shielded welding (MAG / MIG) welding torch such as gas guide, guide wire, cooling, high temperature insulation, etc.

[0004] In addition to the above-mentioned limitations in the prior art, the common limitations are: the overall rigidity of the split-type interconnection structure is poor, and the manufacturing is difficult; most The existing technology fails to achieve both high efficiency and high reliability in the two important functions of fusion reliability control and reliable gas protection in high temperature areas; especially according to different weldment materials, different weldment plate thicknesses, and different At the channel level, under the same welding torch body, only by replacing the accessories, different side wall fusion control methods can be realized respectively, and different ultra-narrow gap gas shielded welding (MAG / MIG) welding process requirements can be met, just like a narrow gap gas Shielded welding (MAG / MIG) welding torch body can meet the two-pass process of each layer under the wide welding groove assembly gap (G≈10mm), and can also meet the requirements of each layer under the ultra-narrow gap (G≈5mm~7mm). Single-layer process, which has not been seen in the prior art

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