Aluminum and aluminum alloy inert-gas shielded welding process suitable for plates of 8-12 mm thickness

Abstract

The invention discloses an aluminum and aluminum alloy inert-gas shielded welding process suitable for plates of 8-12 mm thickness. The aluminum and aluminum alloy inert-gas shielded welding process comprises the steps of adopting flame cutting to cut a welding product so as to obtain 40-degree double-faced one-sided groove with welding joint ratio of 1:2 and ensuring that no grooves exist in the cutting face; sticking a protective film to the plate product, adopting acetone and a rotary file to remove oil stains, aluminum chippings and oxidation films at the positions to be welded, on the end face and edge of the aluminum alloy plate within 20 mm range and expose metal luster before welding, wherein no air bubbles exist in the protective film, the protective film is not bonded in a 50-100 mm range within the welding position; adopting inert-gas shielded welding; selecting corresponding aluminum alloy welding wires to perform welding according to material models of aluminum and aluminum alloy plates during welding, and continuing to perform welding without stop in the middle process. By means of the aluminum and aluminum alloy inert-gas shielded welding process, the process of the welding process can be effectively controlled, the whole process and product quality stability are ensured, disqualification phenomena are decreased, and the aluminum and aluminum alloy inert-gas shielded welding process is suitable for aluminum and aluminum alloy welding of the plates of 8-12 mm thickness.

Description

field of invention [0001] The invention relates to a welding process for aluminum and its alloys, in particular to an inert gas shielded welding process for aluminum and its alloys with a plate thickness of 8-10 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...

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