A pulse current assisted welding device and welding method

Abstract

The invention provides a pulse current auxiliary welding device and method. The pulse current auxiliary welding device comprises a welding machine and a pulse power supply and a trailing welding tight wheel, wherein a positive output end of the welding machine is connected with a welding wire in a welding gun; a negative output end of the welding machine is connected with a workpiece; the positive pole of the pulse power supply is connected with the trailing welding tight wheel; the negative pole of the pulse power supply is connected with the workpiece; the trailing welding tight wheel is arranged in front of the welding gun; and the forward direction of welding is a front side. The device and method provided by the invention have functions of thinning welding line tissues and improving the performance of a connector.

Description

technical field [0001] The invention relates to a pulse current assisted welding device and a welding method, belonging to the technical field of welding. Background technique [0002] Soldering technology is one of the most widely used joining technologies. Among many welding methods, arc welding was developed and applied earlier. At present, both arc welding technology itself and its application technology are relatively mature. However, when arc welding is used to weld metal materials, due to the heating and melting effect of the arc on the connecting part and the filler metal, a liquid molten pool will be formed, and the required weld will be formed after the molten pool solidifies. Therefore, the microstructure of the weld seam has a very important influence on the performance of the welded joint. Due to the influence of the temperature gradient during the solidification of the molten pool, the columnar grain structure is likely to appear on the side of the weld near ...

AI Technical Summary

Problems solved by technology

Among them, when welding aluminum alloys with TIG filler wire, the weld structure can be effectively improved by applying a pulse current between the welding wire and the workpiece, but the magnitude of the pulse current applied by this method is limited by that of the filler wire. Due to the limitation of the material diameter, the power density should not be too large. In addition, when the wire feed and the fuse do not match, the phenomenon that the auxiliary pulse current cannot be applied, or the phenomenon of arcing occurs; if the filler material is used as the melting electrode during welding, Applying pulsed current to the welding wire will affect the welding arc, therefore, the application of pulsed current to the wire is limited

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