Gas tungsten arc welding (GTAW) system and welding method thereof

Abstract

The invention discloses a gas tungsten arc welding (GTAW) system and a welding method thereof. The GTAW system comprises a first welding machine, a second welding machine, a wire conveying device, a first welding torch and a second welding torch, wherein the negative electrode of the first welding machine and the negative electrode of the second welding machine are connected with the first welding torch; the positive electrode of the first welding machine is connected with a workpiece; the positive electrode of the second welding machine is connected with the second welding torch; the first welding machine and the first welding torch form a main loop, so that a main loop arc is formed between the first welding torch and the workpiece; and the second welding machine, the wire conveying device and the second welding torch form a bypass loop, so that a bypass arc is formed between the second welding torch and the first welding torch. According to the method, the resistance heat of a welding wire is fully used for preheating the welding wire, and an arc heating fuse is used, so that the melting efficiency of the welding wire is improved further; due to the arc between a filling wire and a tungsten electrode and a self-adjusting function of the arc, the feeding speed of the welding wire is flexible, so that a wire clamping phenomenon is avoided, and the welding process is relatively stable; and the system and the method are suitable for various metal filling wires.

Description

technical field [0001] The present invention relates to a welding technical solution, more specifically, to a non-melting electrode gas shielded welding method and system. Background technique [0002] GTAW (GTAW) is an arc welding method, the basic principle of which is attached figure 1 shown. The open arc is clearly visible, the arc is stable, no slag, no spatter, easy to operate, easy to realize automation, not easy to produce defects such as welding lumps and slag inclusions, small deformation after welding, high crack resistance of the weld, good mechanical performance and fatigue performance. At the same time, GTAW can weld almost all metals and alloys. GTAW is suitable for structures with relatively small plate thickness, and it is also a traditional root welding method. At present, the main factor restricting the development of GTAW is its low production efficiency. [0003] Welding workers mainly use hot wire to solve the efficiency problem that restricts the d...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, provide a welding system and method that not only guarantees the welding quality but also solves its low efficiency, and increases the deposition efficiency

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