A method for joining dissimilar materials by laser deep penetration-brazing

A technology of dissimilar materials and laser welding joints, applied in laser welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of poor mechanical properties of joints, uneven spread of solder, and reduce radiation and absorption. Improved uniformity and reduced weld spatter

CN106964899BActive Publication Date: 2018-08-07CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2018-08-07

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Abstract

The invention relates to a method for laser deep penetration-brazing connection of a dissimilar material. The method comprises the steps that a laser welding head, a high-pressure gas column nozzle and a protective gas spray pipe can move relative to a base material, when the backside temperature of the base material reaches or exceeds the gasification temperature value of the base material, the laser welding head and the high-pressure gas column nozzle are rotated, the laser welding head is made to incline relative to the upper surface of a workpiece, the high-pressure gas column nozzle is vertically aligned with the upper surface of the workpiece, a high-pressure gas column nozzle gas supply valve is controlled, and an inert gas column sprayed by the high-pressure gas column nozzle penetrates a small welding hole. According to the method for laser deep penetration-brazing connection of the dissimilar material, the high-pressure tiny gas column is used for assisting in maintaining the small hole, uniform distribution of laser energy in the depth direction of the small welding hole is optimized, it is avoided that the laser energy overflows and is lost, and groove-free laser deep penetration-brazing connection of the dissimilar material is achieved.
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Description

technical field

[0001] The invention provides a laser deep penetration-brazing method for connecting dissimilar materials, which belongs to the technical field of dissimilar material connection. It is especially suitable for the connection of dissimilar materials with large difference in melting point, such as the connection of steel and aluminum alloy, titanium alloy and aluminum alloy, etc., and high-performance connection joints can be obtained. Background technique

[0002] With the promulgation of energy saving and emission reduction policies around the world, lightweight design concepts and low-carbon and environmentally friendly products are increasingly favored by consumers. At the same time, with the development of new materials and new processes, the composite structure of dissimilar materials has shown great application prospects in the fields of aerospace, automobiles, locomotives and other vehicles. However, in the face of such a great application prospect, the...

Examples

Embodiment Construction

[0034] Such as figure 1 As shown, the laser welding system used in the embodiment of the present invention includes a laser generator 19, a transmission fiber 18, a welding manipulator 8, a laser welding head 6 that is connected to the laser generator 19 through the transmission fiber 18 and installed on the welding manipulator 8, a high-pressure gas Column nozzle 5 , protective gas nozzle 3 , temperature sensor 10 .

[0035] Both the high-pressure gas column nozzle and the shielding gas nozzle are connected with the laser welding head through the fixed bracket 4, so that the laser welding head, the high-pressure gas column nozzle and the shielding gas nozzle can move synchronously relative to the base metal, and the laser welding head, the high-pressure gas column nozzle and the The shielding gas nozzles are set to be aligned with the welding position.

[0036] The temperature sensor 10 is placed below the starting point of welding for real-time acquisition of the backside t...