Method for controlling stirring and balanced oscillating of deep penetration K-TIG welding pool

Abstract

The invention relates to a method for controlling stirring and balanced oscillating of a deep penetration K-TIG welding pool. A tungsten needle is controlled to do axial motion to adjust the distance between the tungsten needle and a weldment while the tungsten needle moves along the welding direction, the motion state of the tungsten needle between the lowest position and the highest position in the axial motion is adjusted, and the welding current output by a welding power supply system is synchronously adjusted, so that the stress state and the heat transfer state of a welding pool are continuously changed, the radial and axial motion states of liquid metal in the welding pool are further changed, and the stirring and oscillating effects are formed in the welding pool. According to the method provided by the invention, peripheral auxiliary welding equipment does not need to be added, and on the basis of original deep penetration K-TIG welding equipment, the state of the welding pool is changed by coupling tungsten needle height changes and welding current changes, so that the stirring and oscillating effects of the welding pool are achieved, the welding process of single-face welding and double-face forming is achieved with lower heat input energy, and the welding pool is good in penetration performance and program transferability.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to a method for controlling stirring and balancing oscillation of a deep penetration K-TIG welding molten pool. Background technique [0002] TIG welding (Tungsten Inert Gas Welding), also known as non-melting inert gas shielded arc welding. The connection method of the welding machine is that the workpiece is connected to the positive pole of the power supply, and the tungsten needle in the welding torch is used as the negative pole. In the keyhole effect TIG (Keyhole Tungsten Inert Gas, K-TIG) welding process, under the action of a large current (greater than 500A), the welded joint quickly produces liquid metal, thereby forming a weld pool. The uneven heat transfer process of instantaneous heating, melting and instantaneous cooling and solidification during welding makes the welded joints prone to large welding residual stress and strain, which affects the mechanical properties...

AI Technical Summary

Problems solved by technology

[0006] (1) The existing technology adopts the method of adding auxiliary equipment on the basis of the original welding equipment, coupling the functions of the two so as to achieve the stirring effect on the welding pool, but this method increases the complexity and cost of the equipment, and gives Installation, testing and debugging bring great inconvenience and low efficiency, making it difficult to popularize and widely apply in welding production

[0007] (2) There is a certain degree of mutual interference between the main welding equipment and the auxiliary equipment in the prior art, and the unreasonable parameters of the auxiliary equipment may bring adverse effects to the normal operation of the main welding equipment, and instead affect the stability of the welding process , reducing welding quality

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