Method for decreasing laser welding pores

A laser welding and porosity technology, which is applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of porosity and zero porosity, and achieve the effect of reducing porosity, reducing heat input, and smooth surface

Inactive Publication Date: 2017-09-22
CHENDU NEW KELI CHEM SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Aiming at the defects of porosity in the welding part in the existing laser welding metal technology, the object of the present invention is to provide a method for reducing the porosity in laser welding, which can reduce the porosity of metal welding to zero and obtain zero porosity metal weldment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A method for reducing pores in laser welding, comprising the steps of:

[0035] Aluminum alloy with a thickness of 2mm and martensitic stainless steel with a thickness of 2mm are respectively selected;

[0036] Grinding the surrounding area of ​​the selected aluminum alloy plate and steel plate to remove the surface oxide layer and pollutants. The grinding range is within 40-60mm around the weld, the grinding depth does not exceed 0.2mm, and the grinding lines are parallel to the direction of the weld;

[0037] Put the polished aluminum alloy plate and steel plate into ethanol for 15 minutes, and the ultrasonic power is 300W, and then put them into acetone for ultrasonic cleaning twice, the ultrasonic time is 15 minutes, and the ultrasonic power is 400W;

[0038] Align the processed plates in order and install them on the welding fixture, adjust the position of the plates so that the welding gap between the plates is 0.1mm;

[0039] Start the control switch, pass in th...

Embodiment 2

[0044] A method for reducing pores in laser welding, comprising the steps of:

[0045] Select stainless steel with a thickness of 1mm and martensitic stainless steel with a thickness of 3mm;

[0046] Grinding the surrounding area of ​​the selected aluminum alloy plate and steel plate to remove the surface oxide layer and pollutants. The grinding range is within 40-60mm around the weld, the grinding depth does not exceed 0.2mm, and the grinding lines are parallel to the direction of the weld;

[0047] Put the polished aluminum alloy plate and steel plate into ethanol for 15 minutes, and the ultrasonic power is 300W, and then put them into acetone for ultrasonic cleaning twice, the ultrasonic time is 15 minutes, and the ultrasonic power is 400W;

[0048] Align the processed plates in order and install them on the welding fixture, adjust the position of the plates so that the welding gap between the plates is 0.1mm;

[0049] Start the control switch, pass in the shielding gas, a...

Embodiment 3

[0054] A method for reducing pores in laser welding, comprising the steps of:

[0055] Select manganese steel with a thickness of 3mm and martensitic stainless steel with a thickness of 3mm;

[0056] Grinding the surrounding area of ​​the selected aluminum alloy plate and steel plate to remove the surface oxide layer and pollutants. The grinding range is within 40-60mm around the weld, the grinding depth does not exceed 0.2mm, and the grinding lines are parallel to the direction of the weld;

[0057] Put the polished aluminum alloy plate and steel plate into ethanol for 15 minutes, and the ultrasonic power is 300W, and then put them into acetone for ultrasonic cleaning twice, the ultrasonic time is 15 minutes, and the ultrasonic power is 400W;

[0058] Align the processed plates in order and install them on the welding fixture, adjust the position of the plates so that the welding gap between the plates is 0.1mm;

[0059] Start the control switch, pass in the shielding gas, a...

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Abstract

The invention provides a method for decreasing laser welding pores, and relates to the technical field of laser welding. The method for decreasing the laser welding pores comprises the steps of (1) placing two metal to-be-welded parts in a horizontal butt joint manner to form a to-be-welded workpiece; (2) clamping and fixing the two ends of the metal to-be-welded workpiece; (3) preheating the metal to-be-welded workpiece through laser beams; and (4) starting a control switch, introducing a protective gas, igniting electric arcs for 1 s to 2 s, emitting laser, combining laser emitted by a laser A and a laser B into one laser beam, and moving a high pressure air rifle which injects acetone together with the laser A and the laser B. According to the method, a device utilized in the method comprises the two lasers, firstly, the material surface is subjected to preheating treatment, an oxide film generated on the surface is scrubbed through acetone, and then, the two lasers emit the two laser beams to melt the material for welding, so that metal weld joint porosity is obviously decreased, and porosity of 8% to 10% during laser welding is decreased to zero.

Description

technical field [0001] The invention relates to the technical field of laser welding, in particular to a method for reducing pores in laser welding. 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. When the power density is small (ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/14B23K26/21B23K26/60
CPCB23K26/14B23K26/21B23K26/60
Inventor 陈庆曾军堂陈兵
Owner CHENDU NEW KELI CHEM SCI CO LTD
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