A welding method for welding thick plates with hollow tungsten very high penetration TIG filler wire

Abstract

The invention relates to a welding method for hollow tungsten extremely high-deep melting TIG wire-filled thick plates, which comprises the following steps: Step 1: Fix the workpiece to be welded on the welding fixture; Step 2: Start the welding machine and set the welding parameters: welding The current is 300-1000A, the arcing current is 350-1100A, the cut-off current is 200-300A, the arcing time is 0.4-0.6s, the transition time is 0.5-0.8s, the falling time is 2-3s, and the ion gas flow rate is 4 ‑6L / min, the protective gas flow rate is 15‑20L / min, the advance gas supply time is 3‑5s, the inner hole of the hollow tungsten electrode is filled with argon gas, the gas flow rate is 3‑5L / min, and the gas flow rate is 18‑20L / min min, the gas delay after welding is 15-40s, the workpiece gap is 0.2-0.5mm, the welding speed is 200-500mm / min; the angle between the wire feeding nozzle and the tungsten electrode is 15°-30°, and the wire feeding speed is 100- 350mm / min; Step 3: Press the welding preparation and welding start buttons on the welding machine to start welding thick plates. The invention realizes one-time penetration of thick plates, and ensures the formation of high-quality weld seams while realizing high-speed welding of thick plates.

Description

technical field [0001] The invention relates to a welding method, in particular to a welding method for welding thick plates with hollow tungsten very high deep penetration TIG filler wire. Background technique [0002] For a long time, argon tungsten arc welding has a stable welding process and good welding quality, and has been widely used in actual welding production. However, this method has obvious defects: the single-pass welding seam has shallow penetration, low deposition rate and no Suitable for thick plate welding. The high penetration keyhole STIG welding system (SWS-1000) developed by Shanghai Duomu Industrial Co., Ltd. achieves the effect of plasma arc through high-efficiency electromagnetic compression of the arc. The arc energy is concentrated during welding, and the arc pressure and molten pool liquid metal during welding The surface tension is balanced, forming a stable small hole effect, with super penetrating ability, and can penetrate steel plates below ...

AI Technical Summary

Problems solved by technology

[0002] For a long time, argon tungsten arc welding has a stable welding process and good welding quality, and has been widely used in actual welding production. However, this method has obvious defects: the single-pass welding seam has shallow penetration, low deposition rate and no Suitable for thick plate welding

[0003] Due to the large welding current and large welding melting width, it is required to increase the wire feeding speed when feeding the wire, but because the external wire feeding will make the welding wire stay in the arc for a short time, when the wire feeding speed increases, It is prone to welding defects such as welding wire entering the molten pool to form inclusions before it melts in time

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