Combined welding technology of high-strength aluminium alloy laser-MIG

A composite welding and aluminum alloy technology, which is applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of large welding penetration and achieve the effects of large welding penetration, avoiding weld porosity defects, and low assembly requirements

Inactive Publication Date: 2011-01-19
NO 52 INST OF CHINA NORTH IND GRP CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies in existing welding methods such as MIG welding, TIG welding and single laser welding in welding high-strength aluminum alloys, and provide a welding method with large weldi...

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  • Combined welding technology of high-strength aluminium alloy laser-MIG
  • Combined welding technology of high-strength aluminium alloy laser-MIG

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Effect test

Embodiment 1

[0046] In this embodiment, laser-MIG composite welding technology is adopted for 7A05 high-strength aluminum alloy with a thickness of 3 mm. The welding method is single-sided welding and double-sided forming without groove opening. It includes the following steps: The combined welding method is laser welding in front and MIG argon arc welding in the back; (2) set MIG welding gas, and obtain a mixed gas with a volume ratio of He and Ar of 1:4 through the gas mixing valve; (3) set laser welding The power is 2000W, the welding speed is 2000mm / s, and the defocus is -2mm~-1mm; (4) Set the MIG welding current to 140A~160A, and the welding voltage: 20.5V~21.5V; (5) Set it according to the welding speed Set the MIG welding gas flow rate at 35L / min to 45L / min, and the distance between heat sources at 1mm to 2mm.

Embodiment 2

[0048]In this embodiment, laser-MIG composite welding technology is adopted for 7A05 high-strength aluminum alloy with a thickness of 6mm. The welding method is single-sided welding and double-sided forming, without groove opening. The combined welding method is laser welding in front and MIG argon arc welding in the back; (2) set MIG welding gas, and obtain a mixed gas with a volume ratio of He and Ar of 1:4 through the gas mixing valve; (3) set laser welding Power is 3000W, welding speed is 1400mm / s, defocus is -3mm~-2mm; (4) Set MIG welding current to 160A~180A, welding voltage: 20.5V~22.5V; (5) Set according to welding speed Set the MIG welding gas flow rate at 26L / min to 35L / min, and the distance between heat sources at 1mm to 2mm.

Embodiment 3

[0050] This embodiment is aimed at the 7A52 high-strength aluminum alloy with a thickness of 10 mm, using laser-MIG composite welding technology. The welding method is single-sided welding and double-sided forming, without opening the bevel. It includes the following steps: The combined welding method is laser welding in front and MIG argon arc welding in the back; (2) set MIG welding gas, and obtain a mixed gas with a volume ratio of He and Ar of 1:4 through the gas mixing valve; (3) set laser welding The power is 5000W, the welding speed is 1000mm / s, and the defocus is -3mm~-2mm; (4) Set the MIG welding current to 200A~220A, and the welding voltage: 23.5V~24.5V; (5) Set the welding speed according to Set the MIG welding gas flow rate at 26L / min to 35L / min, and the distance between heat sources at 2mm to 3mm.

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Abstract

The invention discloses a combined welding technology of high-strength aluminium alloy laser-MIG, comprising the following steps: a. setting a combined mode and a welding gun angle; b. setting defocusing amount according to the thickness of a welding plate; c. setting combined welding protective gas as a mixed gas of helium and argon with a volume ratio of helium to argon of 1:4; d. according to welding speed, setting MIG welding air flow quantity; e. according to laser power and MIG current, setting MIG welding voltage value; f. according to the MIG welding voltage value and current value, setting the heat source interval between laser welding and MIG welding; and g. synchronously carrying out laser-MIG compound welding. The technology of the invention can obtain a welding line with clean and smooth welding surface, and the welding line has good shaping and does not have sag. The technology has the characteristics of big welding depth of fusion, high speed, small workpiece deformation, low assembly requirement, strong weld pool bridging ability and the like, is easy to integrate and can effectively control the problems of overlarge welding lines and base metal crystalline grain and the like caused by overheating in the aluminium alloy welding process.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a high-strength aluminum alloy laser-MIG composite welding technology. Background technique [0002] Welding technology is an indispensable key manufacturing technology in the modern manufacturing industry, and has penetrated into various production fields of the modern machinery manufacturing industry. High quality and high efficiency have become a sign to measure whether a welding method and welding process are excellent. [0003] At present, the aluminum alloys used for vehicles in my country are mainly high-strength aluminum alloys such as aluminum-zinc-magnesium series 7A52, 7A05 and 7A09, which have high yield strength and tensile strength. At present, welding methods such as MIG welding, TIG welding and laser welding are mainly used for such materials. However, due to factors such as high thermal expansion coefficient and thermal conductivity of aluminum all...

Claims

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Application Information

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IPC IPC(8): B23K28/02
Inventor 谭兵马冰王有祁陈东高齐果王法科张立君甄立玲刘红伟明珠
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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