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Nonconventional low-temperature gas shielded laser welding method

A low-temperature gas, laser welding technology, used in laser welding equipment, welding equipment, metal processing equipment and other directions, can solve the problems of discontinuous forming, welding pores, unstable welding process, etc. The effect of increasing the cooling rate and reducing welding defects

Inactive Publication Date: 2017-01-04
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem that the existing conventional laser welding process is easy to generate laser plasma, resulting in unstable welding process, easy to produce discontinuous forming, welding pores and other defects, and provides a laser welding method with low temperature gas protection

Method used

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specific Embodiment approach 1

[0026] Specific embodiment one: a kind of unconventional low temperature gas shielded laser welding method of this embodiment, it is carried out according to the following steps:

[0027] Step 1: Before welding, process the parts to be welded into V-shaped grooves, U-shaped grooves or Y-shaped grooves, and grind and clean the processed grooves and the surfaces on both sides. After cleaning, the workpiece to be welded is fixed on the welding fixture;

[0028] Step 2: Use the fixture to rigidly fix the laser head and the wire feeding mechanism;

[0029] Step 3: Set welding process parameters:

[0030] The welding speed is 0.5~5m / min, the laser power is 2000~6000W, the defocus is -3~+3, if the welding wire is filled, the wire feeding speed is 0.2~1.0m / min; the shielding gas adopts Ar gas and He gas Or the mixed gas of the two, the protective gas flow rate is 5-20L / min, and the protective gas temperature is -30℃~-160℃;

[0031] Step 4: In the actual welding process, the robot i...

specific Embodiment approach 2

[0033] Embodiment 2: This embodiment is different from Embodiment 1 in that: the workpiece to be welded is steel, aluminum or titanium alloy. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0034] Embodiment 3: This embodiment is different from Embodiment 1 in that: the temperature of the shielding gas is -50°C to -160°C. Others are the same as in the first embodiment.

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Abstract

The invention provides a nonconventional low-temperature gas shielded laser welding method, and relates to the field of material processing engineering, which aims at solving the defects and problems of easiness in generation of forming discontinuity, welding air holes and the like due to instability of a welding process caused by easiness in production of laser plasma in the existing conventional laser welding process. The nonconventional low-temperature gas shielded laser welding method is characterized in that on the basis of conventional laser welding, a welding shielded gas delivery device is improved. The nonconventional low-temperature gas shielded laser welding method has the advantages that the welding seam structure is refined, and the hardness is improved; the air holes and heat cracks are inhibited, and the welding defects are reduced; the stability of the welding process is improved, the laser absorbing rate is improved, and the welding cost is reduced.

Description

technical field [0001] The invention relates to the field of material processing engineering, in particular to an unconventional low-temperature gas-protected laser welding method. Background technique [0002] With the rapid development of the manufacturing industry and the continuous improvement of welding technology, welded structures have been widely used. In modern welding technology, quality, efficiency, and low cost are important indicators in welding industrial production, and with the rapid development of aerospace, aviation, transportation, ocean engineering, etc., a large amount of welding workload is required every year. Higher requirements are put forward for high-quality, high-efficiency and low-cost welding methods. [0003] As one of the "welding technologies with the most development potential in the 21st century", laser has high energy density, good weld quality, large aspect ratio, small heat-affected zone, small welding deformation, fast welding speed an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/14B23K26/70
CPCB23K26/14B23K26/703
Inventor 雷正龙黎炳蔚倪隆昌吴世博卢楠楠陈彦宾
Owner HARBIN INST OF TECH
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