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

A technology of disturbance characteristics and welding method, applied in the field of welding torches and die castings, can solve the problems of welding wire melting, difficult control, and difficulty in reaching the bottom of the molten pool.

Inactive Publication Date: 2014-12-24
CHONGQING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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

Method used

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

Examples

Experimental program
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Effect test

Embodiment 1

[0024] The object is the die-cast block AZ91D magnesium alloy. While argon tungsten arc welding is welding the die-cast magnesium alloy, the tungsten needle is inserted into the molten pool and moves synchronously with the welding torch 1. The vibration motor drives the tungsten needle to vibrate, and the vibration frequency is 20Hz. The pool is vibrated and disturbed, and the inclination angle of the tungsten needle is 30° to facilitate the escape of gas in the molten pool.

[0025] Experimental results: The calculated weld porosity is 0.172, and compared with the control example 1, the weld porosity decreases by 39.2%.

Embodiment 2

[0027] The object is die-cast block A356 aluminum alloy. While argon tungsten arc welding is used to weld the die-cast aluminum alloy, the tungsten needle is inserted into the molten pool and moves synchronously with the welding torch 1. The vibration motor drives the tungsten needle to vibrate. The vibration frequency is 1000Hz. The pool is vibrated and disturbed, and the inclination angle of the tungsten needle is 30° to facilitate the escape of gas in the molten pool.

[0028] Experimental results: The calculated weld porosity is 0.148, which is 46.4% lower than that of Control Example 2.

Embodiment 3

[0030] The object is the die-cast block AZ91D magnesium alloy. While argon tungsten arc welding is welding the die-cast magnesium alloy, the tungsten needle is inserted into the molten pool and moves synchronously with the welding torch 1. The vibration motor drives the tungsten needle to vibrate, and the vibration frequency is 3000Hz. The pool is vibrated and disturbed, and the inclination angle of the tungsten needle is 30° to facilitate the escape of gas in the molten pool.

[0031] Experimental results: The calculated weld porosity is 0.134, and compared with the control example 1, the porosity decreases by 52.7%.

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PUM

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/32
CPCB23K9/167B23K9/32
Inventor 游国强李滋亮马小黎黎圣林杨永攀
Owner CHONGQING UNIV
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