Narrow gap/ultra-narrow gap gas shielded welding automatic welding torch and manufacturing method thereof

Abstract

The invention relates to a multifunctional narrow-gap / ultra-narrow-gap gas shielded welding automatic welding torch and a manufacturing method thereof. The welding torch includes a plate-type welding torch body; the welding torch body is integrated with a guide wire channel, a circulating water cooling flow channel and a secondary protective air flow channel. There are primary shielding gas intake seat and secondary shielding gas intake seat, water inlet / return pipe seat and welding cable fixed, and a gas splitter device is fixedly connected to the lower part, which is fixed to the lower part of the plate welding torch body through the body / nozzle connection assembly . The steps of the method include: preparing raw materials, processing related parts, embedding and brazing runner groove cover plates, etc., embedding ceramic strips, spraying ceramic coatings on external components, and the like. The advantages of the present invention are: high integration, high-speed guide wire, stable and reliable conduction, gas conduction, high-efficiency heat dissipation, reliable insulation; long life; easy processing; low cost; good overall rigidity; The application of the gun is integrated; the work efficiency is high, safe and reliable.

Description

technical field [0001] The invention relates to a narrow gap / ultra-narrow gap gas-shielded welding automatic welding torch and a manufacturing method thereof, which is a multifunctional integrated overall plate-type narrow-gap / ultra-narrow gap gas-shielded welding (MAG / MIG) automatic welding torch designed and manufactured based on composite processing of plates. A welding torch belongs to the technical field of welding. 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 technologic...

AI Technical Summary

Problems solved by technology

The above-mentioned prior art also has the following limitations: 1. It is difficult to arbitrarily change the size and shape of the cross-section of the flow channel due to thick-walled pipes, and there are many brazed joints with complex structures and high manufacturing costs; 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 complex, and the carbon brush scheme for large current conduction requires extremely high conductive reliability technical measures; 3. The existence of flux strip technology has led to a significant increase in the complexity of process technology and equipment increase, the slag cleaning is difficult and the probability of slag inclusion defects increases, and the application of large and thick plates is difficult; 4. The nozzle is located outside the groove. When the plate thickness is greater than a certain thickness, large metallurgical protection must be used to achieve good metallurgical protection. Shielding gas with high flow rate and wide range will bring a large gas consumption, and the larger 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, 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; This important function fails to achieve high efficiency and high reliability at the same time; especially according to different weldment materials, different weldment plate thicknesses, and different weld bead levels, only the replacement of accessories under the same welding torch body It can realize different side wall fusion control methods and meet different ultra-narrow gap gas shielded welding (MAG / MIG) welding process requirements, just like a narrow gap gas shielded welding (MAG / MIG) welding torch body, which can meet wide The double-pass process per layer under the welding groove assembly gap (G≈10mm) can also meet the single-pass process per layer under the ultra-narrow gap (G=5mm~7mm), which has not been seen in the existing technology

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