Three-element mixed protective gas for aluminum alloy MIG (Metal-Inert Gas Welding) welding and welding method

A technology of shielding gas and welding method, used in welding/welding/cutting items, welding equipment, welding medium, etc., can solve the problems of fracture resistance, poor fatigue performance, unstable and stable welding process, and large arc range of welded structures. , to achieve the effect of arc not flowing and easy to control, stable ternary mixed gas shielded welding process, and improving welding quality

Inactive Publication Date: 2014-08-06
CRRC QINGDAO SIFANG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the fracture resistance and fatigue performance of the welded structure are poor, the welding process is unstable and stable, the arc range is large, and slag splashes during welding

Method used

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  • Three-element mixed protective gas for aluminum alloy MIG (Metal-Inert Gas Welding) welding and welding method
  • Three-element mixed protective gas for aluminum alloy MIG (Metal-Inert Gas Welding) welding and welding method
  • Three-element mixed protective gas for aluminum alloy MIG (Metal-Inert Gas Welding) welding and welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] The composition of helium, argon and nitrogen in the ternary mixed shielding gas for aluminum alloy MIG welding is distributed by volume percentage, which are helium: 20%, argon: 79.995%, nitrogen: 0.005%.

[0062] The above-mentioned ternary mixed shielding gas is used, the meltable welding wire is used as the electrode, and the arc burning between the continuously fed welding wire and the workpiece to be welded is used as the heat source to melt the welding wire and the base metal. The continuous melting of the welding wire should transition in the form of droplets Into the welding pool, it fuses with the molten base metal and condenses to form the weld metal. The ternary mixed shielding gas is continuously delivered to the welding area through the nozzle of the welding torch, so that the arc, the molten pool and the surrounding base metal are protected from the surrounding air. harmful effects.

[0063] The welding arc shrinks obviously, the width of the arc shrinks,...

Embodiment 2

[0065] The composition of helium, argon and nitrogen in the ternary mixed shielding gas for aluminum alloy MIG welding is distributed by volume percentage, which are helium: 40%, argon: 59.974%, nitrogen: 0.026%.

[0066] The above-mentioned ternary mixed shielding gas is used, the meltable welding wire is used as the electrode, and the arc burning between the continuously fed welding wire and the workpiece to be welded is used as the heat source to melt the welding wire and the base metal. The continuous melting of the welding wire should transition in the form of droplets Into the welding pool, it fuses with the molten base metal and condenses to form the weld metal. The ternary mixed shielding gas is continuously delivered to the welding area through the nozzle of the welding torch, so that the arc, the molten pool and the surrounding base metal are protected from the surrounding air. harmful effects.

[0067] The welding arc shrinks obviously, the width of the arc shrinks,...

Embodiment 3

[0069] The composition of helium, argon and nitrogen in the ternary mixed protective gas for aluminum alloy MIG welding is distributed by volume percentage, which are helium: 25%, argon: 74.995%, nitrogen: 0.05%.

[0070] The above-mentioned ternary mixed shielding gas is used, the meltable welding wire is used as the electrode, and the arc burning between the continuously fed welding wire and the workpiece to be welded is used as the heat source to melt the welding wire and the base metal. The continuous melting of the welding wire should transition in the form of droplets Into the welding pool, it fuses with the molten base metal and condenses to form the weld metal. The ternary mixed shielding gas is continuously delivered to the welding area through the nozzle of the welding torch, so that the arc, the molten pool and the surrounding base metal are protected from the surrounding air. harmful effects.

[0071] The welding arc shrinks obviously, the width of the arc shrinks,...

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Abstract

The invention relates to a three-element mixed protective gas for aluminum alloy MIG welding and a welding method. The three-element mixed protective gas comprises helium, argon and a small amount of nitrogen, wherein based on the volume percentage, the helium accounts for 20-40%, the argon accounts for 59.974-79.995%, and the argon accounts for 0.005-0.026%. The welding method comprises the following steps: adopting a meltable welding wire as an electrode, taking an electric arc between the continuously feed-in welding wire and a welded workpiece as a heat source to melt the welding wire and a base metal, as the welding wire is continuously molten, using a molten drop manner to transit the welding wire to a welding pool, fusing the welding wire with the molten base metal, forming weld metal after condensing, and continuously delivering the three-element mixed protective gas through a welding gun nozzle to the welding area, so as to prevent the electric arc, the molten pool and the adjacent base metal from harmful action of the ambient air. The three-element mixed protective gas and the welding method can improve anti-fracture performance and fatigue performance of the welding structure, obtain larger welding penetration under the same welding heat input, and reduce the welding heat input.

Description

technical field [0001] The invention relates to the field of MIG welding, in particular to a ternary mixed shielding gas and a welding method for aluminum alloy MIG welding. Background technique [0002] Aluminum alloy has high specific strength, fracture toughness, fatigue strength and corrosion resistance stability, so it has become a non-ferrous metal structural material widely used in high-speed trains, aerospace and other industries. Various large launch vehicles developed in my country widely use aluminum alloy as the main structural material, and supersonic aircraft and automobile structural parts and light tank armor also use high-strength aluminum alloy as structural material. [0003] Since 2006, my country has invested heavily in the construction of high-speed railways, and the mileage of high-speed railways has increased rapidly, ranking among the top in the world, providing more convenience for people to travel. Aluminum alloy welding is a key supporting techno...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/38B23K9/173
CPCB23K35/383B23K9/173B23K2103/10
Inventor 路浩张洪涛刘英臣刘胜龙邢立伟石中年
Owner CRRC QINGDAO SIFANG CO LTD
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