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Method for welding thick aluminum alloy plate

An aluminum alloy, thick plate technology, applied in welding equipment, arc welding equipment, metal processing equipment, etc., can solve the problems of difficult to guarantee product size, large consumption of ternary gas, difficult to guarantee quality, etc., and achieve the difficulty of post-weld correction Low cost, low cost, small welding deformation effect

Active Publication Date: 2013-02-13
BEIJING CED RAILWAY ELECTRIC TECH
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Problems solved by technology

[0002] At present, on locomotives such as railway main line EMUs and AC high-power electric locomotives, the welding process of the heat-treated aluminum alloy 6082 material with a plate thickness of 15mm, and the welding process of the heat-treated aluminum alloy structural parts with fillet joints all use molten gas. Shielded welding, this method has large welding deformation, it is difficult to ensure the product size, it is difficult to correct after welding, the quality is not easy to guarantee, and the production efficiency is low; high cost

Method used

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specific Embodiment approach

[0014] The method for aluminum alloy thick plate welding of the present invention, its preferred embodiment is:

[0015] Including cleaning process, preheating process, welding process;

[0016] Described cleaning process adopts chemical cleaning, comprises steps:

[0017] Prepare NaOH solution with a mass concentration of 8-10% and HNO with a mass concentration of 40-50% at 50-60°C respectively 3 solution (HNO 3 The solution does not limit the temperature);

[0018] Immerse the parts to be welded in NaOH solution for more than 10 minutes, take out the parts and rinse with cold water to remove the NaOH residue on the surface of the workpiece;

[0019] Put cleaned parts into HNO 3 Soak in the solution for 30 seconds to 1 minute, take out the parts and put them in water to clean and remove the nitric acid residue on the surface of the workpiece.

[0020] The pH value of the NaOH solution is between 13-14, the HNO 3 The pH of the solution is 1.

[0021] In the preheating p...

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Abstract

The invention discloses a method for welding a thick aluminum alloy plate. The method comprises a cleaning process, a preheating process and a welding process, wherein the cleaning process is carried out in a chemical cleaning way and comprises steps of: dipping a part to be welded in a 8-10% NaOH solution for more than 10 minutes, and then dipping in a 40-50% HNO3 solution for 30 seconds to 1 minute, wherein sensing heating equipment is adopted in the preheating process, and the preheating is carried out at 230 to 250 DEG C; joints in the welding process are in form of angle joint, and the non-melting electrode tungsten electrode gas shielded welding is carried out in the welding method, the welding parameter can be shown as that the current is 250 to 290A, the current polarity is performed by alternating current, Ar with purity not less than 99.99% is adopted as the protective gas, and the gas flow is at 7-13 liters per minute. Through the method, little welding deformation is generated, the correcting is easily carried out after welding, the product quality can be improved, the production efficiency can be increased, and the manufacturing cost can be greatly reduced.

Description

technical field [0001] The invention relates to an aluminum alloy plate welding process, in particular to a method for welding an aluminum alloy thick plate. Background technique [0002] At present, on locomotives such as railway main line EMUs and AC high-power electric locomotives, the welding process of the heat-treated aluminum alloy 6082 material with a plate thickness of 15mm, and the welding process of the heat-treated aluminum alloy structural parts with fillet joints all use molten gas. Shielded welding, this method has large welding deformation, it is difficult to ensure the product size, it is difficult to correct after welding, the quality is not easy to guarantee, and the production efficiency is low; high cost. Contents of the invention [0003] The object of the present invention is to provide a method for welding aluminum alloy thick plates which can improve product quality, increase production efficiency and reduce manufacturing cost. [0004] The purpo...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/235
Inventor 马君苏安社翟立飒
Owner BEIJING CED RAILWAY ELECTRIC TECH
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