Welding gun for coupling-arc AA-TIG welding

Abstract

The invention discloses a welding gun for coupling-arc AA-TIG (argon arc-tungsten inert gas) welding. A ceramic spacer (7) divides a welding gun main body into two independent gas chambers and insulates electricity-conducting paths of a main arc and an auxiliary arc mutually; two semi-cylindrical tungsten electrode fixedly-connecting blocks (3) are positioned on the two sides of the ceramic spacer (7) respectively; a plurality of regulating holes (12) are formed at middle positions of semicircular end surfaces of the tungsten electrode fixedly-connecting blocks (3) along the radial directions of the circumferences of the semicircular end surfaces; a tungsten electrode (6) and a tungsten electrode (6') are inserted into different regulating holes (12) respectively; a water-guiding and electricity-conducting pipe (9) is tightly adhered to the outer wall of a main body gun barrel (2) on one side of the main arc, is filled with cooling water, and switches on a circuit of the main arc together with the main body gun barrel (2) on one side of the main arc, the tungsten electrode fixedly-connecting blocks (3) and the tungsten electrode (6); and a gas-guiding and electricity-conducting hole (8) for inflating active mixed gas of the auxiliary arc switches on a circuit of the auxiliary arc together with the main body gun barrel (2) on one side of the auxiliary arc, the tungsten electrode fixedly-connecting blocks (3) and the tungsten electrode (6').

Description

technical field [0001] The present invention relates to active welding and high-speed welding method and non-melting arc welding torch. technical background [0002] TIG welding (Tungsten Inert Gas welding) is a kind of non-melting inert gas shielded welding. It has the outstanding advantages of stable welding process, high welding quality and various types of welding materials. It is a high-quality representative of conventional welding methods. However, it is affected by the limited current carrying capacity of the tungsten electrode and the non-concentrated arc heat. It has the disadvantages of shallow penetration and low deposition rate of single-pass welds. It is generally suitable for thin plate welding and root welding. When welding medium and thick plates, it is generally necessary to use a high-power welding power source or use some auxiliary processes, such as preheating before welding, multi-layer multi-pass welding, simultaneous welding on both sides, etc. [00...

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Problems solved by technology

[0005] Because the above method requires two processes or two welding torches during welding, the welding production efficiency is low, and it is difficult to apply to the automatic process, and the adjustment of parameters such as the angle and distance between the two welding torches in the double-gun coupled arc AA-TIG welding method is difficult. The scope of application of this method is limited. In view of these shortcomings, a single gun coupled arc AA-TIG (Arc assisted activating TIG) welding method is proposed, that is, two tungsten electrodes are arranged along the welding direction in one welding torch, and the front welding current The smaller one is the auxiliary tungsten electrode, which generates an auxiliary arc during welding, and the one with a larger welding current is the main tungsten electrode, which generates a main arc during welding

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