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Ultrasonic-assisted laser spot welding device and method

A laser spot welding and ultrasonic assisted technology, applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems that it is difficult to achieve the expected effect, the temperature and mechanical conditions of the workpiece preheating are difficult to control, etc., and achieve continuous ultrasonic assistance. Laser spot welding, the effect of eliminating residual stress and increasing connection strength

Active Publication Date: 2020-02-07
CHANGCHUN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, whether the preheating temperature of the workpiece, the electromagnetic field, and the ultrasonic field can achieve real coupling is still to be discussed, and it is difficult to control the complex mechanical conditions of multi-physics fields in the molten pool, and it is difficult to achieve the expected effect.

Method used

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  • Ultrasonic-assisted laser spot welding device and method
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  • Ultrasonic-assisted laser spot welding device and method

Examples

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Embodiment 1

[0039] Such as Figure 1-3 As shown, the ultrasonic-assisted laser spot welding device of the present invention includes: a laser welding head 1, a C-shaped frame 3, a six-axis linkage robot 19, a laser 20, an ultrasonic vibration device and a pneumatic transmission system. The laser welding head 1 is installed on the six-axis linkage robot 19 and connected with the laser 20; the C-shaped frame 3 is installed under the laser welding head 1, and the upper end of the C-shaped frame 3 is provided with an opening 4, and the laser 2 emitted by the laser welding head 1 can Pass through the opening 4 and irradiate onto the metal material 5 to be welded below the opening 4; the pneumatic transmission system is fixed on the lower end of the C-shaped frame 3, and the ultrasonic vibration device is installed on the pneumatic transmission system. The laser 20 is also connected to a laser control system 21 , and the six-axis linkage robot 19 is also connected to a robot control system 22 ....

Embodiment 2

[0046] Example 2 Ultrasonic-assisted laser spot welding of dissimilar metals between high-strength steel and 5083 aluminum alloy

[0047] The device of Example 1 was used to weld high-strength steel and 5083 aluminum alloy.

[0048] (1) The welding materials are high-strength steel with a thickness of 3mm and 5083 aluminum alloy with a thickness of 5mm. First, use acetone to remove the surface oil of the two metal materials to be welded, and then put the aluminum alloy into sodium hydroxide and nitric acid respectively for alkali Washing and pickling to remove the oxide film.

[0049] (2) Use a short-pulse laser beam to perform laser surface texturing on one surface of the high-strength steel, and ablate a circular array of micro-pits on the surface of the metal material ( Figure 5 ), the average power of the laser beam is 20W, the pulse frequency is 20kHz, the scanning speed is 140mm / s, the average diameter of micro pits is 220-250μm, the depth is 150-180μm, and the surface...

Embodiment 3

[0056] Example 3 Ultrasonic-assisted laser spot welding of 304 stainless steel and magnesium alloy dissimilar metals

[0057] The device of Example 1 is used to weld 304 stainless steel and magnesium alloy.

[0058] (1) The welding metal materials are 304 stainless steel with a thickness of 2mm and magnesium alloy with a thickness of 5mm. First, use acetone to remove the surface oil stains of the two metal materials to be welded, and then put the magnesium alloy into dilute hydrochloric acid and sodium hydroxide for acidification. Washing and alkaline washing to remove the oxide film.

[0059] (2) Laser surface texturing is performed on one surface of 304 stainless steel with an ultrashort pulse laser beam, and groove-shaped micro-pits are ablated on the surface of the metal material ( Figure 6 ), the average power of the laser beam is 100W, the pulse frequency is 200kHz, the scanning speed is 150mm / s, the micro pit width is 200-230μm, the depth is 160-200μm, and the surface...

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Abstract

The invention discloses an ultrasonic-assisted laser spot welding device and method. The device comprises: a laser welding head, a C-shaped frame, a six-axis linkage robot, a laser, an ultrasonic vibration device and a pneumatic transmission system; the laser welding head is installed on a six-axis On the linkage robot, it is connected with the laser; the C-shaped frame is installed under the laser welding head, and the upper end of the C-shaped frame is provided with an opening. The laser emitted by the laser welding head can pass through the opening and irradiate the metal material to be welded below the opening; The pneumatic transmission system is fixed on the lower end of the C-shaped frame, and the ultrasonic vibration device is installed on the pneumatic transmission system. The invention introduces high-frequency ultrasonic energy into welding, effectively controls interface reaction and strengthens melt flow, improves interface wettability, refines weld grains, and subsequent ultrasonic vibration is more helpful to reduce or eliminate weld and The residual stress of the connection surface improves the connection strength.

Description

technical field [0001] The invention relates to the field of welding technology, in particular to an ultrasonic-assisted laser spot welding device and method. Background technique [0002] According to relevant data from the Environmental Protection Agency, except for the power industry, the transportation industry has the highest greenhouse gas emissions, and the weight reduction of the body is one of the key methods to solve this problem. In order to achieve light weight while ensuring the safety factor of the car, high-strength steel is used for the body structure and load-bearing parts, and light alloy materials such as aluminum alloy are used for the rest to give full play to the advantages of various materials. Therefore, the joining technology of dissimilar materials has become a research hotspot. [0003] In the welding of single-material steel body, the automation and mechanization of resistance spot welding has irreplaceable advantages, and has been used in large-s...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K26/346B23K26/22B23K26/70
CPCB23K26/22B23K26/346B23K26/70
Inventor 刘佳李忠石岩白陈明张宏刘双宇刘凤德徐春鹰
Owner CHANGCHUN UNIV OF SCI & TECH
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