10-12mm plate thickness aluminum and aluminum alloy tungsten inert gas (TIG) welding process

Abstract

The invention discloses a 10-12mm plate thickness aluminum and aluminum alloy tungsten inert gas (TIG) welding process. The welding process is characterized by including the following steps that (1) a to-be-welded end face is cleaned in a mechanism mode, and then the mechanically cleaned surface is carefully wiped by organic solvent or cleaning agent to remove residual organic matters or metal dust; (2) butt welding is applied, a Y-shaped groove is designed at the position of a joint, the groove angle is 55-65 degrees, and the butt joint gap is 1-2mm; (3) TIG welding is applied, and welding process parameters are set, for example, the welding current is 280-300A, the protective gas flow is 16-18L / min, the tungsten electrode diameter is 5mm, the welding wire diameter is 4-5mm, and nozzle hole diameter of a welding gun is 14-16mm; (4) a welded position is preheated, the pre-heating temperature is 90-100 DEG C, and the preheating time is 30-40 seconds; (5) during welding, multi-layer multi-channel continuous welding can be applied, and the temperature among layers is controlled in a range from 170 DEG C to 210 DEG C. According to the 10-12mm plate thickness aluminum and aluminum alloy TIG welding process, the welding process can be performed under effective control, stable whole process and product qualities are guaranteed, and phenomena of unqualified products can be reduced.

Description

field of invention [0001] The invention relates to an aluminum and its alloy welding process, in particular to a 10-12mm thickness aluminum and its alloy TIG welding process. 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 processing and corrosion resistanc...

AI Technical Summary

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