A mechanical vibration-assisted tig welding method and device for droplet transfer

Abstract

The invention provides a TIG (tungsten inert gas) welding method for auxiliary mechanical vibration droplet transfer and a TIG welding device for the same. The TIG welding device comprises a TIG power supply, a wire feeder, a guide tube, an auxiliary mechanical vibration device, a wire feeding nozzle and a welding wire, wherein the wire feeder is connected with the guide tube, the guide tube is connected with the wire feeding nozzle, and the auxiliary mechanical vibration device is fixed to a frame. A vibration rod is driven to vertically vibrate in a reciprocating manner by an internal body driving motor and a transmission device, and a buffer spring is sleeved between the vibration rod and a contact. The TIG welding method includes the steps: igniting an arc heating workpiece, forming a molten bath after arc is stable, and then starting the wire feeder to automatically feed in the welding wire; and starting the auxiliary mechanical vibration device, leading the vibration rod, the contact and the welding wire to mechanically vibrate, and performing welding under the action of auxiliary mechanical vibration. The TIG welding device is simple, convenient in operation and high in applicability, and compared with digital control equipment, the TIG welding device greatly reduces cost and is convenient for industrial popularization.

Description

(1) Technical field [0001] The invention relates to a welding technology, in particular to a TIG welding method and a device thereof in which mechanical vibration assists droplet transfer. (2) Background technology [0002] Tungsten argon arc welding (TIG) has the characteristics of high welding quality, stable arc, and wide application range. It is a welding method commonly used in actual production. According to different wire feeding methods, tungsten argon arc welding (TIG) can be divided into manual wire feeding and automatic wire feeding. For conventional automatic wire-feeding TIG welding, the welding wire is heated and melted by the arc, and the droplet mainly relies on its own gravity and arc force to break away from the shackles of the surface tension at the end of the welding wire to achieve the transition. There are the following disadvantages: (1) The droplet is larger than The droplet transitions to the molten pool, which has a large impact on the molten pool ...

AI Technical Summary

Problems solved by technology

For conventional automatic wire-feeding TIG welding, the welding wire is heated and melted by the arc, and the droplet mainly relies on its own gravity and arc force to break away from the shackles of the surface tension at the end of the welding wire to achieve the transition. There are the following disadvantages: (1) The droplet is larger than The droplet transitions to the molten pool, which has a large impact on the molten pool and is prone to splashing; (2) The molten droplet absorbs more arc energy, and the molten droplet is overheated, which is likely to cause inhomogeneity of the weld structure, and the width of the heat-affected zone is large; (3) Large droplet transfer leads to slow droplet transfer and low deposition efficiency

The high cost of CMT and STT melting gas shielded welding technology is the key factor limiting its popularization and application. At the same time, the drastic change of current during welding will inevitably affect the stability of the arc.

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