Welding method and system for reducing laser welding heat affected zone and refining structure

A laser welding and heat-affected zone technology, applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problem that the uniformity and performance consistency of large-thickness welded joints cannot be guaranteed, and the oscillating laser tuning energy field is not used. Unable to meet the problems of one-time forming of medium and thick plates, to achieve the effect of optimizing and regulating laser welding forming and quality, improving the uniformity of structure and properties, and improving welding stability

Pending Publication Date: 2022-06-07
哈尔滨工大焊接科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method uses a low-temperature protective gas to protect and cool the molten pool and its vicinity. The atmosphere environment requires high requirements and is difficult to control. At the same time, it still needs to bevel the base metal and cannot meet the one-time forming of the medium-thick plate connection. complex
Patent document CN201210002191.6 discloses a vacuum laser welding equipment and method. The description of the process means of this method is too simple, and the swing laser is not used to tune the energy field, which cannot ensure the uniformity and performance of the large-thickness welded joint in the thickness direction. sex

Method used

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  • Welding method and system for reducing laser welding heat affected zone and refining structure
  • Welding method and system for reducing laser welding heat affected zone and refining structure
  • Welding method and system for reducing laser welding heat affected zone and refining structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0072] Step 1: During welding, CO2 gas lasers, YAG solid-state lasers, semiconductor lasers, and fiber lasers can be used as lasers.

[0073]Step 2: Fix the polished or cleaned workpiece 5 on the welding fixture 6, and place it on the workbench in the vacuum chamber 2, and the workbench is equipped with a conformal condenser plate 7.

[0074] Step 3: Fix the ultrasonic generating device 4 on the laser head 1 with a special fixture 3, so that after the laser welding is completed, it can realize the ultrasonic vibration impact after welding by controlling the laser head without light output.

[0075] Step 4: Evacuate the vacuum chamber 2, and the vacuum pressure is 100-10000Pa.

[0076] Step 5: Vacuum laser welding, specifically:

[0077] S51: According to the thickness of the workpiece 5 to be welded, the laser power is 3500-5500 W, the welding speed is 0.3-1.8 m / min, and the defocusing amount is -10-10 mm.

[0078] S52: the temperature range of the conformal condensing plate...

Embodiment 2

[0083] In this example, the 20mm thick aluminum alloy joint is welded by vacuum swing laser welding method. The laser adopts TRUMPF high-power laser with a maximum power of 10000W. The laser head is an IPG swing laser welding head. Other equipment includes a KUKA robot, pumping Vacuum system and vacuum chamber.

[0084] Step 1: Remove the oxide film on the surface of the workpiece to be welded by laser cleaning;

[0085] Step 2: Place the polished, pickled or laser-cleaned workpiece to be welded on the welding workbench in the vacuum chamber, and set the accompanying condensing plate on the workbench. The area of ​​the traveling condensing plate covers at least the aluminum alloy joint. Then fix it with a fixture suitable for the structure and size of the weldment.

[0086] Step 3: Adjust the shape of the oscillating laser spot to a circular spot, align the center of the spot with the center of the starting spot, and adjust the traveling mechanism of the welding platform in ...

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Abstract

The invention belongs to the technical field of laser welding, and particularly discloses a welding method and system for reducing a laser welding heat affected zone and refining a structure. The method comprises the steps that the surface of a to-be-welded workpiece is pretreated; s2, welding process parameters and working parameters of the conformal condensation plate are set; s3, integrating an ultrasonic generating device, wherein the laser head and the ultrasonic generating device are arranged at an interval; s4, according to the set welding process parameters, the workpiece is welded in the vacuum environment, the laser head moves according to the preset path and speed, the conformal condensation plate works, meanwhile, the ultrasonic generation device is started, and ultrasonic vibration is conducted on a welding seam of the workpiece; and S5, the workpiece is subjected to recrystallization annealing at the specified temperature. According to the method, welding energy distribution is accurately regulated and controlled, meanwhile, the follow-up condensation plate with the self-adaptive temperature adjustment is assisted, follow-up ultrasonic treatment is carried out on a welding seam, then laser welding forming and quality are optimized and regulated, the structure property uniformity is improved, a laser welding heat affected zone is reduced, and the structure is refined.

Description

technical field [0001] The invention belongs to the field of laser welding, and more particularly, relates to a welding method and system for reducing the heat-affected zone of laser welding and refining the structure. Background technique [0002] In the process of fusion welding, the metal material is melted under the action of the heat source to form a weld. Between the weld metal and the base metal, there is a certain range of areas affected by the heat of the welding process, which is called the heat-affected zone. Due to the effect of welding thermal cycle, the microstructure of the weld zone and the heat-affected zone is different from that of the base metal, and often shows a coarse group, which in turn affects the service performance of the welded joint. In many practical engineering applications, there are often certain requirements for the width of the heat-affected zone and the microstructure of the weld. Therefore, reducing the width of the heat-affected zone a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K26/21B23K26/122B23K26/70
CPCB23K26/21B23K26/1224B23K26/123B23K26/702
Inventor 陈曦姜梦姜楠何崇文李方志陈源陈彦宾
Owner 哈尔滨工大焊接科技有限公司
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