Air guiding non-consumable gas shielded arc welding method

Abstract

The invention relates to an air guiding non-consumable gas shielded arc welding method, and belongs to the technical field of welding methods. The welding method comprises the following steps: a penetrating arc is established through a welding control system, the inner cavity of a hollow pipe-shaped electrode and the center of an electric arc below the hollow pipe-shaped electrode are enabled to be in the high-pressure or negative-pressure state through an air filling device and an air extracting device, the pressure gradient of the penetrating arc in the radial direction is increased, and the straightness of the electric arc is improved; and through the adjustment of the high-pressure value or the negative-pressure value of the center of the electric arc and the welding process parameters of the electric arc, the straightness and the energy density of the air guiding electric arc are adjusted so as to realize good control of heat input of parent metal. The welding method has the advantages that the penetrating arc is established on the basis of a traditional plasma arc and a TIG arc and with the assistance of the air guiding characteristic, the welding penetration can be increased remarkably, the welding quality of a medium plate is improved, and the high-efficiency and high-quality welding is realized.

Description

technical field [0001] The invention relates to a welding method for air-guided non-melting electrode gas shielded welding, which belongs to the technical field of welding methods. Background technique [0002] With the rapid development of science and technology, welding technology, as an irreplaceable important processing technology, has penetrated into various fields such as automobiles, machinery manufacturing, military, aerospace and civilian daily life, and is playing an increasingly important role. Although new welding technologies such as laser welding, friction stir welding, and electron beam welding have emerged with the increase in the number of connections between metals, arc welding is still considered to be a relatively economical connection method that can achieve reliable connections between metals. How to improve its welding productivity, how to improve its welding quality, and how to realize its welding production automation have received more and more atte...

AI Technical Summary

Problems solved by technology

At present, large groove, multi-layer and multi-pass MAG / MIG welding or submerged arc welding are mostly used for welding thick plates, but this not only increases the welding workload, but also increases the consumption of welding materials and welding costs, and reduces production. efficiency, and the large heat input, wide heat-affected zone, and coarse grains reduce the mechanical properties of the joint

Although plasma arc welding can realize the welding of thick plates, due to the thickness, the tendency of small hole instability will be aggravated, and penetration welding cannot be realized when the plate thickness reaches a certain level.

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