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Active agent for laser welding and method for laser welding by utilizing same

A technology of laser welding and active agent, which is applied in laser welding equipment, welding medium, welding equipment, etc., and can solve the problems of reduced laser energy utilization rate and low laser absorption rate, etc.

Inactive Publication Date: 2011-09-14
TIANJIN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The high reflectivity of the material means the low absorption rate of laser light, the ratio of light energy into heat energy will be small, and the utilization rate of laser energy will be greatly reduced

Method used

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  • Active agent for laser welding and method for laser welding by utilizing same
  • Active agent for laser welding and method for laser welding by utilizing same
  • Active agent for laser welding and method for laser welding by utilizing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] Weigh 8g of lithium chloride powder (80 mesh) and 2g of potassium fluoride powder (50 mesh) and mix evenly, then add 8g of water and mix to make a paste coating agent, and use No. 400 sandpaper to polish the surface of the welding test piece deal with. Apply the adjusted paste coating agent on the surface of the welded test piece, and dry it. The thickness of the coating layer is 0.6mm. Use the above welding equipment for laser welding, and the shielding gas is argon.

Embodiment 2

[0033] Take by weighing lithium chloride powder (50 mesh) 5g, sodium chloride powder (80 mesh) 2g, potassium chloride powder (80 mesh) 3g, potassium fluoride powder (50 mesh) 5g mix uniformly, then add 9g water to mix and adjust Make a paste coating agent, and use No. 400 sandpaper to polish the surface of the welded test piece. Apply the adjusted paste coating agent on the surface of the welded test piece, and dry it. The thickness of the coating layer is 0.6mm. Use the above welding equipment for laser welding, and the shielding gas is argon.

Embodiment 3

[0035]Weigh 10g of sodium chloride powder (100 mesh) and 5g of sodium fluoride powder (100 mesh) and mix evenly, then add 12g of water and mix to make a paste coating agent, and use No. 80 sandpaper to polish the surface of the welding test piece deal with. Apply the adjusted paste coating agent on the surface of the welded test piece, and dry it. The thickness of the coating layer is 0.5mm. Laser welding is carried out by using the above-mentioned welding equipment, the shielding gas is a mixed gas of argon and oxygen, and the volume percentage of oxygen is 25%.

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Abstract

The invention discloses an active agent and a method for carrying out surface treatment on materials to be welded of aluminium and aluminium alloys so as to improve the energy utilization rate of the aluminium and the aluminium alloys, deepen the fusion depth of welding seams and further obtain higher welding quality. The active agent for laser welding consists of a chloride and a fluoride, wherein the mass ratio of the chloride to the fluoride is (1-2): (1-4); the chloride is at least one of lithium chloride, sodium chloride, potassium chloride, zinc chloride, magnesium chloride, aluminium chloride, calcium chloride or tin chloride; and the fluoride is at least one of lithium fluoride, sodium fluoride, magnesium fluoride or calcium fluoride. When the surface treatment is carried out, firstly the fluoride and the chloride are mixed fully and uniformly, water is added to form a supersaturated solution, then the supersaturated solution is coated on the surface of a welded test piece as a coating agent, then drying is carried out, and finally laser welding is carried out under the condition of gas protection.

Description

technical field [0001] The present invention relates to an activating agent, and more particularly, relates to an activating agent for laser welding and its application method. Background technique [0002] Laser welding uses laser as the welding heat source, which is a heat source with high energy density. During welding, the laser can focus the laser beam with high energy density on a small area. Therefore, when the thickness of the test plate is the same, laser welding has higher welding efficiency than other welding methods, and the heat input is relatively small. The heat-affected zone Very small, good quality weld formation. According to the power density of the laser actually acting on the workpiece or the characteristics of the weld seam formed after laser welding, laser welding can be divided into two types: heat conduction welding and deep penetration welding, which are often distinguished according to the difference in laser power density during welding. The pow...

Claims

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Application Information

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IPC IPC(8): B23K35/365B23K26/12B23K26/42B23K26/60
Inventor 杨立军张晓枫胡云龙任成龙黄怡
Owner TIANJIN UNIV
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