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TIG ((tungsten inert gas) welding process of less than 3mm thick aluminum and aluminum alloys

A welding process and plate thickness technology, applied in welding medium, welding equipment, metal processing, etc., can solve the problems of large melting latent heat, difficult welding work, low melting point, etc., and achieve the effect of reducing unqualified phenomena and stabilizing product quality

Inactive Publication Date: 2015-04-08
WUHU CIMC RUIJIANG AUTOMOBILE
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Problems solved by technology

Compared with iron, aluminum has physical and chemical properties such as strong oxidation, low melting point, fast thermal conductivity, large linear expansion coefficient, large latent heat of fusion, low high-temperature strength, and the ability to form eutectics with low melting points, which brings a series of physical and chemical properties to welding work. Difficulties

Method used

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Embodiment Construction

[0017] A TIG welding process of aluminum and its alloys with a plate thickness of less than 3mm, characterized in that it comprises the following steps:

[0018] (1) Butt welding is adopted, and I-shaped groove is opened at the joint;

[0019] (2) Before welding, a protective film must be pasted on the plate. There must be no air bubbles in the protective film. No protective film should be pasted 50-100mm inward of the welding place. Use acetone and a rotary file to remove the end face and edge of the aluminum alloy plate within 20mm. Oil stains, aluminum chips, and oxide films on the welding parts reveal metallic luster;

[0020] (3) TIG welding is adopted, and the welding process parameters are set as follows: welding current 100-170A, shielding gas flow rate 8-12L / min, tungsten electrode diameter 2-3mm, welding wire diameter 2-3mm, nozzle aperture 8-12mm;

[0021] (4) During welding, two operators perform manual TIG vertical welding from bottom to top simultaneously on the...

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Abstract

The invention discloses a TIG ((tungsten inert gas) welding process of less than 3mm thick aluminum and aluminum alloys. The process includes the steps of performing butt welding, and making an I-shaped groove at a welding joint; attaching a protective film to a plate before welding; performing TIG welding, and setting welding process parameters, including welding current 100 to 170A, protective gas flow 8 to 12L / min, tungsten electrode diameter 2 to 3mm, welding rod diameter 2 to 3mm, and nozzle diameter 8 to 12mm; allowing two operators to perform manual vertical TIG welding to the outside and inside of a workpiece from bottom to top, respectively. The TIG welding process has the advantages that the process is subjected to effective control, process stability and product quality stability are ensured, fewer unqualified products occur, and the process is suitable for the welding of less than 3mm thick aluminum and aluminum alloys.

Description

field of invention [0001] The invention relates to a welding process for aluminum and its alloys, in particular to a TIG welding process for aluminum and its alloys with a plate thickness of less than 3 mm. Background technique [0002] Aluminum is one of the most abundant elements in the earth's crust, with a content of 8.8%, ranking first among the four major metal elements and accounting for 1 / 3 of the total mass of metal elements. Due to the improvement of aluminum technology, the aluminum industry is developing at an astonishing speed. By 2004, the world's aluminum output reached 29.8 million tons, of which my country's output was 6.8 million tons, ranking third in the world, and there were more than a thousand kinds of aluminum alloys. Due to the development of aluminum materials, the processing technology of aluminum has also been advanced by leaps and bounds. Due to its light weight, high specific strength, good low temperature performance, good plasticity, easy pr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/23B23K9/235
CPCB23K9/167B23K9/23B23K9/235B23K35/383B23K2101/185B23K2103/10
Inventor 李朋朋杨麟张剑何冬梅
Owner WUHU CIMC RUIJIANG AUTOMOBILE
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