Die-casting piece welding method and welding gun with interventional mechanical disturbance feature

Abstract

The invention discloses a die-casting piece welding method with an interventional mechanical disturbance feature. During fusion welding of a die-casting piece, a heat-resistant disturbing needle which is vibrating or rotating is inserted into a pool. Compared with the prior art, the disturbing needle used as disturbing medium in the invention can deep into the pool to fully agitate the pool, gas especially at deep positions in the pool can effectively and fully escape and the welding quality is better. A disturbing device applicable to the welding method disclosed by the invention is provided with a micro vibrating or rotating mechanism, the output end of the vibrating or rotating mechanism is connected with the heat-resistant disturbing needle which can be inserted into the welding pool, the disturbing needle synchronously moves with a welding gun during welding, the pool agitating effect of the disturbing needle is better, the content of air voids in welding seams can be greatly reduced and good welded joints can be obtained.

Description

technical field [0001] The invention relates to the field of material processing, in particular to a die-casting welding method with the characteristic of interventional mechanical disturbance and a welding gun applicable to the method. Background technique [0002] Die casting is currently an important forming process for forming alloy castings of non-ferrous metals such as zinc, aluminum, magnesium, and copper. The process of die casting is characterized by high strength and hardness of castings, complex shapes and thin walls of castings, and high productivity. At present, die castings are widely used in various industries. For example, aluminum die casting products are widely used in the automotive industry due to their strength, durability, light weight and recyclability. Magnesium alloy die-casting products are widely used in transportation, hand tools, aerospace and 3C fields, etc. However, due to the influence of the die-casting process, the interior of the die-cast...

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Problems solved by technology

[0003] The two patent documents whose publication numbers are CN102794542A and CN101239415A both disclose a welding method that uses an external vibration source to vibrate the welding wire to reduce welding porosity during the welding process. Although the welding wire vibration can reduce welding porosity to a certain extent, there are the following Two problems: 1) The welding wire will melt during the welding process, and it is difficult to go deep into the bottom of the molten pool. Its vibration can only make the surface of the molten pool vibrate to a certain extent, so that the pores in the molten pool near the surface can escape, and the inside of the molten pool especially The pores in the deeper part cannot escape from the molten pool; 2) The welding wire needs to maintain a stable feed while applying vibration to the molten pool, which is difficult to control

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