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Aluminum alloy laser oscillation welding method

A welding process and aluminum alloy technology, which is applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve problems such as limiting the application of laser welding technology, and achieve the purpose of avoiding internal cracks in the weld, excellent comprehensive mechanical properties of the weld, and excellent welding performance. Sew over smooth effect

Inactive Publication Date: 2017-12-08
BEIJING HANGXING MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the increase of welding thickness during the welding process, the metallurgical pores formed by hydrogen and alloy element vapor and the process pores formed by the unstable collapse of laser pores seriously exceed the standard, which seriously limits the application of laser welding technology in the production of aluminum alloy structural parts. manufacturing applications

Method used

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  • Aluminum alloy laser oscillation welding method
  • Aluminum alloy laser oscillation welding method
  • Aluminum alloy laser oscillation welding method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Welding the 4mm thick LF6 aluminum alloy lock bottom butt joint structure.

[0051] Before laser welding, clean up impurities such as oxide scale and oil stains within the range of (20-50) mm from the center of the weld; when welding, the laser power P is 4400W, using figure 1 with figure 2 The welding method shown is for welding, the laser beam movement path is a sawtooth movement path, the swing amplitude H is 2mm, the swing frequency is 300Hz, the welding speed v is 1.8m / min, the spot diameter D is 0.3mm, and the defocusing amount is l It is 0mm. 99.99% high-purity argon gas is used for front protection, and the front gas flow rate is 16L / min.

[0052] Welding result surface: the weld surface is well formed, without pores, cracks and other defects. The average tensile strength of the weld at room temperature can reach 305MPa, and the average elongation after fracture is 5.5%. The quality of the joint welds meets the requirements of Class I welds in the Q / SB 535-2013 "T...

Embodiment 2

[0054] The 5mm thick LF6 aluminum alloy lock bottom butt joint structure is welded.

[0055] Before laser welding, clean the oxide scale, oil stains and other impurities within the range of (20-50) mm from the center of the weld; when welding, the laser power P is 5200W, using image 3 with Figure 4 The welding method shown for welding, the laser beam movement path is composed of a circular movement path unit, the swing amplitude H is 2mm, the swing frequency is 250Hz, the welding speed v is 1.8m / min, and the spot diameter D is 0.3mm. The focal amount l is 0mm. 99.99% high-purity argon gas is used for front protection, and the front gas flow rate is 16L / min.

[0056] Welding result surface: the weld surface is well formed, without pores, cracks and other defects. The average tensile strength of the weld at room temperature can reach 294MPa, and the average elongation after fracture is 6.7%. The quality of the joint welds meets the requirements of Class I welds in Q / SB 535-2013 "...

Embodiment 3

[0058] Welding the 4mm thick LF6 aluminum alloy lock bottom butt joint structure.

[0059] Before laser welding, clean the oxide scale, oil and other impurities within the range of (20-50) mm from the center of the weld; during welding, the laser power P is 6000W, and the Figure 5 with Image 6 The welding method shown for welding, the laser beam movement path is composed of "∞" type movement path unit, the swing amplitude H is 2.5mm, the swing frequency is 300Hz, the welding speed v is 3m / min, and the spot diameter D is 0.3mm , The defocus amount l is -3mm. Use 99.99% high-purity argon for front protection, and the front gas flow rate is 15L / min.

[0060] Welding result surface: the weld surface is well formed, without pores, cracks and other defects. The average tensile strength of the weld at room temperature can reach 307MPa, and the average elongation after fracture is 5.9%. The quality of the joint welds meets the requirements of Class I welds in Q / SB 535-2013 "Technical C...

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Abstract

The invention discloses an aluminum alloy laser swing welding process method, which belongs to the technical field of welding. The method includes welding with an oscillating laser beam, wherein during welding, the oscillating laser beam advances along an axis parallel to the welding direction, and while advancing, the oscillating laser beam is in the direction of the axis. Both sides oscillate back and forth to form a zigzag motion path, and the motion path has the same swing amplitude on both sides of the shaft, and the motion path is formed by repeatedly arranging a plurality of motion path units. The invention can effectively avoid the occurrence of internal cracks and porosity defects in the laser welding seam of the aluminum alloy, the welding seam formed by welding is excessively smooth, and the comprehensive mechanical properties of the welding seam are excellent.

Description

Technical field [0001] The invention belongs to the technical field of welding, and relates to a laser swing welding process method for aluminum alloys. Background technique [0002] Aluminum alloy has low material density, high strength, high thermal conductivity, strong corrosion resistance, and good physical and mechanical properties. Therefore, it is widely used in the welding structure of industrial products, especially aerospace products. [0003] The aluminum alloy welding process is prone to serious pore defects. Porosity is the most prone welding defect in aluminum alloy welding. The main reason for its formation is the sharp drop in the solubility of hydrogen during the solidification of the melt and the lack of time for some alloying element vapor to escape. The existence of pores reduces the compactness and corrosion resistance, and at the same time reduces the effective bearing area of ​​the weld when stressed, which is easy to form stress concentration, thereby reduc...

Claims

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Application Information

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IPC IPC(8): B23K26/21B23K26/12B23K103/10
CPCB23K26/21B23K26/123B23K2103/10
Inventor 曲宏韬步贤政王志敏胡洋韩铁韩维群
Owner BEIJING HANGXING MACHINERY MFG CO LTD
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