16-18mm plate thickness aluminum and aluminum alloy tungsten inert gas (TIG) welding process

Abstract

The invention discloses a 16-18mm plate thickness aluminum and aluminum alloy tungsten inert gas (TIG) welding process. The welding process is characterized by including the following steps that an X-shaped groove is selected according to the plate thickness and a welding position, the front side included angle is 60 degrees, the reverse side included angle is 45 degrees, the truncated edge is 2-3mm, and the root gap is 0-3mm; greasy dirt, aluminum skimmings and oxidation films of to-be-welded positions in a range of 50mm of aluminum alloy plate end faces and edges are cleaned by acetone before welding so as to expose metallic luster; TIG welding is applied, and welding process parameters are set, for example, the welding current is 360-380A, the protective gas flow is 24-25L/min, the tungsten electrode diameter is 6mm, the welding wire diameter is 5-6mm, and nozzle hole diameter is 16-20mm; welded positions are preheated, the preheating temperature is 200-220 DEG C, and the preheating time is 0.5-1min; during welding, two operators synchronously perform manual TIG vertical position welding from bottom to top on outer surfaces and inner surfaces of workpieces respectively, a welding gun of the outer surfaces of the workpieces serves as a main gun to perform orderly welding gun left-right swinging and wire filling, and a welding gun of the inner surfaces of the workpieces assists in wire filling. By means of the 16-18mm plate thickness aluminum and aluminum alloy TIG welding process, the welding process can be performer under effectively control, stable whole process and products qualities can be guaranteed, and phenomena of unqualified products are reduced.

Description

field of invention [0001] The invention relates to an aluminum and its alloy welding process, in particular to a 16-18mm 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