Method of swinging electric arc welding with double hollow cathodes

Abstract

The invention relates to a method of swinging electric arc welding with double hollow cathodes and belongs to the field of welding methods. The two identical hollow tubular cathodes are arranged and connected with two welding power supplies and two air extractors correspondingly. By means of the air extractors, a negative pressure state is formed in a cavity and an electric arc central area of one tubular cathode, and under the action of atmospheric pressure, a constrained electric arc is formed while the other electric arc is in the free state; the situation is kept for a certain period of time, the constrained electric arc is recovered into the free state while the other electric arc turns into the constrained state, and the situation is repeated, so that the two electric arcs are always in the form that one is in the free state while the other one is in the constrained state. A welding wire is fed in from the space between the two cathodes, and molten drops swing in a reciprocating mode under the condition that the free state and the constrained state occur alternately. The method increases the welding speed, increases the current bearing capacity, reduces welding deformation, generates a vibrating stirring effect on a molten pool, prevents thick and big grains from occurring, and improves the quality of weld joints. The heat input of the electric arcs to workpieces is reduced, and the range of a heat affected zone is narrowed.

Description

technical field [0001] The invention relates to a double hollow cathode swing arc welding method, which belongs to the field of welding methods. Background technique [0002] With the gradual development of modern science and technology, welding has gradually moved from a skill to a science. Traditional extensive welding methods can no longer meet the requirements of modern industry, and high-quality and efficient advanced welding technology has become the goal pursued by welding workers. [0003] The confined arc can increase the arc energy density under the same welding process parameters, thereby improving the welding speed and welding production efficiency. In the current research, the confined arc welding method is mainly plasma arc welding. This welding method is an advanced technology of traditional TIG welding. Through the three major compression effects of mechanical compression, self-magnetic compression and water-cooled compression, the arc produces a restraint e...

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Problems solved by technology

[0008] The purpose of the present invention is to overcome the defects and deficiencies of the existing welding methods, and propose a double hollow cathode swing arc welding method

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