TIG (tungsten inert gas welding) power assistant double TIG (tungsten inert gas welding) compound heat source welding equipment and method

Abstract

The invention provides a TIG (tungsten inert gas welding) power assistant double TIG (tungsten inert gas welding) compound heat source welding equipment and method, which heats up a welding wire through resistance heat or electric arc heat production at different-droplet transferring patterns to improve the welding wire cladding efficiency. The TIG power assistant double TIG compound heat source welding equipment consists of a main TIG power, a TIG main welding torch, a conducting wire nozzle, an assistant TIG power, a wire feed device and a work piece, wherein the main TIG power is connectedwith the TIG main welding torch and the work piece respectively, the main TIG power, the TIG main welding torch, a main welding arc and the work piece constitute a main welding loop; the welding method is that leading the assistant TIG power in a routine argon tungsten-arc welding system, connecting two electrodes of the assistant TIG power on the wire feed device and the work piece to form an electric conduction loop, and changing the size of the assistant TIG power electric current in the welding process to form the different-droplet transferring patterns. The invention has simple equipment, low cost, and is convenient to promote in the industrial production.

Description

(1) Technical field [0001] The invention relates to welding technology, in particular to a TIG power source-assisted double-TIG composite heat source welding equipment and method. (2) Background technology [0002] Due to the reliable protection of the shielding gas on the arc and the molten pool, the argon tungsten arc welding completely eliminates the damage of oxygen, nitrogen, hydrogen and other impurity gases to the welding metal. The welding arc is extremely stable, which can achieve high-quality welding and obtain excellent welds. However, due to the limitation of the current carrying capacity of the tungsten electrode, the arc power is restricted, resulting in low welding speed and low production efficiency. [0003] The hot wire TIG welding method is to preheat the welding wire on the basis of ordinary TIG welding, so as to increase the welding heat input, increase the melting speed, and thus increase the welding speed. The principle is to heat the welding wire to ...

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Problems solved by technology

However, due to the use of TIG arc heating, its energy density is very high. For materials with low thermal conductivity, it is easy to melt before the welding wire is fed, which will destroy the normal welding wire feeding process.

[0006] The above two methods are not ideal for hot wires with high resistivity and low thermal conductivity, such as pure iron, which greatly limits the application of welding materials in high-efficiency TIG welding. How to expand the selection range of welding wire and Realizing the combination of high-quality and high-efficiency welding has become the key to expanding the application of TIG welding in industrial production, especially in some special fields, such as high-quality and high-efficiency surfacing welding of pure iron elastic belts

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