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Middle-thickness magnesium alloy CO2 laser-MIG composite welding process

A composite welding and magnesium alloy technology, which is applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of large welding penetration, low efficiency, and low assembly requirements, and achieve large welding penetration and weld surface Clean, low-assembly-required effect

Inactive Publication Date: 2009-05-20
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 TIG welding, laser-TIG welding, FSW welding, single laser welding or electron beam welding, etc. in the welding of medium-thickness magnesium alloy plates, and to provide a welding with large welding penetration and high welding speed. Medium-thickness magnesium alloy CO with the characteristics of high speed, low efficiency, small workpiece deformation, low assembly requirements, strong molten pool bridging ability, and easy integration 2 Laser-MIG hybrid welding process

Method used

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  • Middle-thickness magnesium alloy CO2 laser-MIG composite welding process
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  • Middle-thickness magnesium alloy CO2 laser-MIG composite welding process

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Embodiment 1

[0033] The medium-thickness magnesium alloy CO of the present embodiment 2 The laser-MIG composite welding process is a single-sided welding and double-sided forming process. The thickness of the welded magnesium alloy plate is t=10mm. It includes the following steps: (1) Design the joint form and welding method, single-sided welding without groove, two The plate butt joint gap is 0~1mm; (2) Set the laser-MIG composite welding composite method as laser welding in front and MIG argon arc welding in the back, and the distance between the two composite heat sources is a=1mm~2mm; (3) Set MIG Welding gas, through the gas mixing valve to obtain a mixed gas with a volume ratio of He and Ar of 1:2, and set the welding gas flow rate of the MIG welding machine to 20L / min~25L / min; (4) Set the MIG welding process specification, The welding current range is 80A-100A, and the dry elongation is 10mm-14mm; (5) The laser welding power is set to 3500W, the welding speed is 1000mm / s, and the def...

Embodiment 2

[0035] The medium-thickness magnesium alloy CO of the present embodiment 2 The laser-MIG composite welding process is a double-sided welding process, and the thickness of the welded magnesium alloy plate is t=20mm. It includes the following steps: (1) Design the joint form and welding method, double-sided welding without opening the groove, and the butt gap between the panels is 0~1mm; (2) Set laser-MIG hybrid welding composite mode as laser welding in front, MIG argon arc welding in the back, the distance between the two composite heat sources is a=1mm~2mm; (3) Set MIG welding gas, pass The gas mixing valve obtains a mixed gas with a volume ratio of He and Ar of 1:2, and sets the welding gas flow rate of the MIG welding machine to 20L / min~25L / min; (4) Set the MIG welding process specification, and the welding current range is 160A~180A, dry elongation 10mm~14mm; (5) Set laser welding power to 4500W, welding speed to 1500mm / s, defocus to 0.

Embodiment 3

[0037] The medium-thickness magnesium alloy CO of the present embodiment 2 The laser-MIG composite welding process is a double-sided welding process, and the thickness of the welded magnesium alloy plate is t=25mm. It includes the following steps: (1) Design the joint form and welding method, according to the attached image 3 Design the groove of the joint, and adopt double-sided welding, and the butt gap is 0~1mm; (2) Set the laser-MIG hybrid welding composite method as laser welding in front and MIG argon arc welding in the rear, and the distance between the two composite heat sources is a= 1mm~2mm; (3) Set the MIG welding gas, obtain a mixed gas with a volume ratio of He and Ar of 1:2 through the gas mixing valve, and set the welding gas flow rate of the MIG welding machine to 20L / min~25L / min; (4) Set the MIG welding process specification, the welding current range is 190A-210A, and the dry elongation is 10mm-14mm; (5) Set the laser welding power to 4500W, the welding spee...

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Abstract

The invention relates to a CO2 laser-MIG composite welding technology for moderately thick magnesium alloy. The technology comprises the following steps: welded joints and welding methods are designed; the composite method and the heat-source interval are designed; the ratio of mixed gas of He and Ar is adjusted; the laser power and the welding speed of CO2 laser welding are selected according to the fusion depth and the thickness of a magnesium alloy plate; the gas feed rate and the welding current of MIG welding are selected; and the composite welding technology is completely finally. The technology solves the problem that general TIG and laser-TIG composite welding are difficult to complete welding of the moderately thick magnesium alloy with high quality and high efficiency, overcomes the defects of the moderately thick magnesium alloy in the process of single-heat source welding, has the characteristics of large welding fusion depth, quick welding speed, small deformation of workpieces, low assembly requirement, strong bridging capacity of a melting bath, easy integration, and so on and can effectively control the problems of overlarge welded seams and parent metal crystal grains, and so on caused by overheating in the process of welding the magnesium alloy.

Description

technical field [0001] The invention belongs to the field of welding, specifically medium-thickness magnesium alloy CO 2 Laser-MIG composite welding process, which is suitable for welding magnesium alloy materials with a thickness of 4mm to 25mm. Background technique [0002] Welding technology is an indispensable and important part of modern manufacturing industry, and has penetrated into various production fields of 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] Magnesium alloys have the characteristics of low melting point, high linear expansion coefficient and thermal conductivity, which lead to problems such as oxidative combustion, cracks and excessively wide heat-affected zone of magnesium alloys during the welding process. Through years of research, great progress has been made in magnesium alloy welding at home and abroad, mainly including ...

Claims

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Application Information

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IPC IPC(8): B23K28/02B23K26/348
Inventor 谭兵陈东高王有祁马冰冯杰才王冬生王法科程朝丰
Owner NO 52 INST OF CHINA NORTH IND GRP CORP
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