Inert gas shielded welding process of aluminum alloy thick plate with thickness being over 12 mm

Abstract

The invention discloses an inert gas shielded welding process of an aluminum alloy thick plate with the thickness being over 12 mm. The inert gas shielded welding process is characterized in that the process includes the following steps that (1) an aluminum alloy portion to be welded is machined into a Y-shaped groove or a double-V-shaped groove, a butt-joint connector mode is adopted, the machined groove or the two side surfaces of the groove are polished and cleaned; (2) preheating before welding is conducted on the aluminum alloy plate to be welded, the preheating temperature ranges from 80 DEG C to 100 DEG C, the preheating time ranges from 3 minutes to 5 minutes, and the interpass temperature is controlled in the range of from 110 DEG C to 130 DEG C; (3) inert gas shielded welding is adopted, and welding process parameters are selected; an ER5356 welding wire with the diameter being 4 mm is selected, the arc voltage ranges from 20 V to 22 V, the current ranges from 140 A to 150 A, the welding speed ranges from 400 mm / min to 500 mm / min, and the gas flow ranges from 12 L / min to 15 L / min; (4) in the welding process, a plurality of layers and steps of welding are adopted, and then natural cooling is conducted after welding. By means of the welding process, the welding process procedure can be conducted under the effective control, stability of the overall process and product quality can be guaranteed, the phenomenon of unqualified products is reduced, welding efficiency is high, and the welding defect rate is low.

Description

field of invention [0001] The invention relates to an aluminum alloy welding process, in particular to an inert gas shielded welding process for an aluminum alloy thick plate with a thickness of more than 12 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, ea...

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