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Welding method for longitudinal butt joint of thin-wall aluminum alloy non-profile long pipes

A welding method and aluminum alloy technology, applied in welding equipment, arc welding equipment, metal processing equipment, etc., can solve the problems of welding joint failure, incomplete fusion, incomplete penetration, etc., to ensure product quality, avoid poor forming, and improve The effect of production efficiency

Inactive Publication Date: 2015-01-28
BEIJING CED RAILWAY ELECTRIC TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, on locomotives such as railway main line EMUs and AC high-power electric locomotives, the welding of aluminum alloy 5083 materials with a plate thickness of 2.5mm, and the longitudinal butt welding of aluminum alloy non-profile long pipe fittings with butt joints, can be performed without the use of welding robots. In most cases, single-side welding and single-side forming are used. The quality of the joints after welding is not high, and it is easy to cause welding defects such as incomplete penetration, pores, lack of fusion, inclusions, slumping, and poor back forming. Not only are the welded joints prone to failure , and it is easy to cause the failure of the entire welded structural parts, it is not easy to ensure the overall strength of the product, and it will have a negative impact on driving safety

Method used

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  • Welding method for longitudinal butt joint of thin-wall aluminum alloy non-profile long pipes
  • Welding method for longitudinal butt joint of thin-wall aluminum alloy non-profile long pipes
  • Welding method for longitudinal butt joint of thin-wall aluminum alloy non-profile long pipes

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specific Embodiment approach

[0019] The welding method of the longitudinal butt joint of thin-walled aluminum alloy non-profile long pipe fittings of the present invention, its preferred specific implementation mode is:

[0020] Including groove preparation process, cleaning process, welding process;

[0021] In the groove preparation process, a groove is made on the part to be welded;

[0022] In the cleaning process, first use a stainless steel wire brush to clean up oxides and other impurities within 25mm on both sides of the part to be welded, and then perform chemical cleaning;

[0023] Described chemical cleaning comprises steps:

[0024] Prepare HNO with a mass concentration of 40-50% respectively 3 solution and 50-60°C mass concentration of 8-10% NaOH solution;

[0025] First, immerse the parts to be welded in NaOH solution, take out the parts and rinse with cold water to remove NaOH residues on the surface of the workpiece;

[0026] Then, put the cleaned parts into HNO 3 Soak in the solution...

specific Embodiment

[0042] 1. Make a bevel on the part to be welded. The bevel type is a single-sided chamfer of 15° and a blunt edge of 1.5mm.

[0043] 2. Use a stainless steel wire brush to clean the oxides and other impurities within 25mm on both sides of the part to be welded until the metallic luster is exposed.

[0044] 3. Prepare 50-60°C containing 8-10% NaOH (caustic soda) solution and HNO respectively 3 (nitric acid) 40-50% solution; soak the parts to be welded in NaOH (caustic soda) for 6-8 minutes. Between -14, when the PH value is less than the specified value, an appropriate amount of NaOH can be added at any time to make the PH value reach the specified value; after taking out the parts from the alkaline solution, rinse them with cold water. Remove NaOH (fire alkali) residues on the surface of the workpiece, and soak the cleaned parts in nitric acid solution for 30 seconds - 1 minute, but not more than 1 minute. Use pH test paper to test the concentration of nitric acid before eac...

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Abstract

The invention discloses a welding method for longitudinal butt joint of thin-wall aluminum alloy non-profile long pipes. Firstly, grooves are formed in to-be-welded portions of parts, cleaned mechanically and then subjected to chemical cleaning through a solution of sodium hydroxide (NaOH) and a solution of hydrogen nitrate (HNO3); and then a gas metal arc welding (GMAW) process is carried out, and welding parameters include current, voltage, current polarity, protective gas, the flow rate of the protective gas, backing gas, and the flow rate of the backing gas, wherein the current is 65-95 amperes, the voltage is 18+ / -3 volts, the current polarity is alternating current, the protective gas is argon gas with purity more than or equal to 99.99%, the flow rate of the protective gas is 16+ / -3 liters per minute, the backing gas is argon gas with purity more than or equal to 99.99%, and the flow rate of the backing gas is 16+ / -3 liters per minute. Through the welding method for the longitudinal butt joint of the thin-wall aluminum alloy non-profile long pipes, the surface forming quality and the inside quality of a double-sided welded joint can be guaranteed, welding defects such as bad shape, lack of penetration, porosity, incomplete fusion, burning-through, collapse and inclusions are avoided, production efficiency is improved, the repair rate is lowered, and quality of products is guaranteed.

Description

technical field [0001] The invention relates to an aluminum alloy welding process, in particular to a welding method for longitudinally butt jointing of thin-walled aluminum alloy non-profile long pipe fittings. Background technique [0002] At present, on locomotives such as railway main line EMUs and AC high-power electric locomotives, the welding of aluminum alloy 5083 materials with a plate thickness of 2.5mm, and the longitudinal butt welding of aluminum alloy non-profile long pipe fittings with butt joints, can be performed without the use of welding robots. In most cases, single-side welding and single-side forming are used. The quality of the joints after welding is not high, and it is easy to cause welding defects such as incomplete penetration, pores, lack of fusion, inclusions, slumping, and poor back forming. Not only are the welded joints prone to failure , and it is easy to cause the failure of the entire welded structural parts, it is difficult to ensure the o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K9/173B23K9/02B23K9/235
Inventor 翟立飒马君苏安社
Owner BEIJING CED RAILWAY ELECTRIC TECH
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