A laser welding method for 7-series aluminum alloy plates with a thickness greater than 40mm

An aluminum alloy sheet and laser welding technology, applied in the field of aluminum alloy materials, can solve the problems of workpiece deformation, affecting popularization and application, and difficult process.

Active Publication Date: 2021-06-04
福建祥鑫股份有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The main problems faced by traditional aluminum alloy welding methods (such as argon arc welding) are: the workpiece is seriously deformed under large heat input, and the joint strength is reduced
However, there are still many problems to be solved in laser welding aluminum alloys. Compared with laser welding ferrous metals such as iron, the process of laser welding aluminum alloys is more difficult, and it is quite difficult for the workpiece to absorb laser energy. reflective and photoplasmonic
Therefore, in actual production, it is necessary to use a high-energy-density laser beam to achieve laser welding of aluminum alloys. This brings about a new problem that the evaporation and burning of alloy elements with low boiling points is very serious, especially the strengthening alloy elements with low boiling points. After damage, the strength of welded joints is greatly reduced, which affects the popularization and application of this technology

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  • A laser welding method for 7-series aluminum alloy plates with a thickness greater than 40mm

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] A laser welding method for 7-series aluminum alloy plates with a thickness greater than 40 mm, the laser welding method comprising: the main laser is a YAG laser, the auxiliary laser is a CO2 laser, and the two are placed in sequence along the welding direction, with the main laser in front and the auxiliary laser In the end, the power of the auxiliary laser is 50% of the power of the main laser, and the beam width of the auxiliary laser is 1.6 times that of the main laser beam. Welding is performed at a certain welding speed, and the protective atmosphere is He gas and Ar gas, with a ratio of 3.5:1.

[0015] The mass percentages of the components of the 7-series aluminum alloy sheet are as follows: Si: 0.5%, Cu: 0.2%, Zn: 5.7%, Mg: 1.7%, Zr: 0.1%, Fe: 0.3%, Ti: 0.25%, Mn: 0.6 %, W: 0.2%, other elements individually ≤0.05%, the sum of other elements ≤0.15%, and the balance is Al.

[0016] The laser power of the main laser is 3kW, the welding speed is 1m / min, the focal l...

Embodiment 2

[0018] A laser welding method for 7-series aluminum alloy plates with a thickness greater than 40 mm, the laser welding method comprising: the main laser is a YAG laser, the auxiliary laser is a CO2 laser, and the two are placed in sequence along the welding direction, with the main laser in front and the auxiliary laser In the end, the power of the auxiliary laser is 40% of the power of the main laser, and the beam width of the auxiliary laser is 1.8 times the beam width of the main laser. Welding is performed at a certain welding speed. The protective atmosphere is He gas and Ar gas, and the ratio is 3:1.

[0019] The laser power of the main laser is 3kW, the welding speed is 1m / min, the focal length of the laser beam is 200mm, and the defocus is +3mm--2mm.

Embodiment 3

[0021] The laser welding method includes: the main laser is a YAG laser, the auxiliary laser is a CO2 laser, the two are placed in sequence along the welding direction, the main laser is in front, the auxiliary laser is behind, the power of the auxiliary laser is 60% of the main laser power, and the auxiliary laser beam The width is 1.3 times the beam width of the main laser, and welding is performed at a certain welding speed. The protective atmosphere is He gas and Ar gas, and the ratio is 4:1.

[0022] The laser power of the main laser is 3kW, the welding speed is 1m / min, the focal length of the laser beam is 200mm, and the defocus is +3mm--2mm.

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Abstract

The invention discloses a laser welding method for 7-series aluminum alloy plates with a thickness greater than 40mm, comprising: the laser welding method includes: a main laser is a YAG laser, an auxiliary laser is a CO2 laser, and the two are placed in sequence along the welding direction, the main The laser is in front, the auxiliary laser is behind, the power of the auxiliary laser is 40%-60% of the power of the main laser, the beam width of the auxiliary laser is 1.3-1.8 times the beam width of the main laser, welding is performed at a certain welding speed, and the protective atmosphere is He Gas and Ar gas, the ratio is 3‑4:1.

Description

technical field [0001] The invention belongs to the field of aluminum alloy materials, and in particular relates to a laser welding method for 7-series aluminum alloy plates with a thickness greater than 40mm. Background technique [0002] Aluminum alloy has low density, high specific strength, high specific stiffness, good fracture toughness and low crack growth rate, making it more and more widely used in the fields of automobiles, ships, tank manufacturing, pressure vessels and aerospace. The following mainly introduces the application of aluminum alloys in the three fields of aerospace, automobile manufacturing and shipbuilding. [0003] The main problems faced by the traditional aluminum alloy welding methods (such as argon arc welding) are: the deformation of the workpiece is serious under the large heat input, and the strength of the joint is reduced. The deformation of the workpiece requires a lot of time wasted in the subsequent correction work, which affects the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/21
CPCB23K26/21B23K2103/10
Inventor 冯永平黄铁兴池海涛刘金霞张建雷
Owner 福建祥鑫股份有限公司
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