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Method for laser-stirring friction composite welding of large-thickness plate

A friction stir and hybrid welding technology, used in laser welding equipment, welding equipment, non-electric welding equipment and other directions, can solve the problems of poor weld formability, easy formation of collapse and root leakage, etc., to improve surface tension and promote force balance , the effect of inhibiting collapse and root leakage

Active Publication Date: 2019-03-19
CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that defects such as collapse and root leakage are easily formed in the current high-power laser welding process, and the weld formability is poor

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  • Method for laser-stirring friction composite welding of large-thickness plate
  • Method for laser-stirring friction composite welding of large-thickness plate

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Embodiment Construction

[0025] The following will be combined with the attached figure 1 and figure 2 Specific embodiments of the present invention will be described in detail.

[0026] In this embodiment, a method for laser-friction stir hybrid welding of large-thickness plates includes the following steps.

[0027] Step 1: Provide the workpiece 1 plate to be welded, which is made of aluminum alloy and has a thickness of 15 mm to 25 mm. Before welding, use an organic solvent to remove surface oil, impurities, etc.

[0028] Step 2: Arrange the friction stir processing head 2 on the back of the plate to be welded 1 .

[0029] Step 3: arrange the laser welding head 3 on the front surface of the workpiece 1 to be welded.

[0030] Step 4: The high-energy laser beam 4 focused by the laser welding head 3 irradiates the upper surface of the workpiece 1 to be welded and moves along the welding direction.

[0031] The power of the high-energy laser beam 4 is greater than 15 kW; the moving speed of the la...

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Abstract

A method for laser-stirring friction composite welding of a large-thickness plate is characterized by comprising the steps that 1, the to-be-welded workpiece plate is provided; 2, a stirring frictionmachining head is arranged on the back of the to-be-welded workpiece plate; 3, a laser welding head is arranged on the front face of the to-be-welded workpiece plate; 4, the upper surface of the to-be-welded workpiece is irradiated by high-energy laser beams focused by the laser welding head, and the high-energy laser beams move in the welding direction; 5, the stirring friction machining head isstarted, rotates at high speed, enters to-be-welded workpiece material and moves in the welding direction; and 6, the welding destination is reached, the stirring friction machining head moves out ofthe to-be-welded workpiece material, and the high-energy laser beams are stopped. In the method, a semi-solid stirring pool is obtained through stirring friction welding, forming of collapse, root leakage and other defects in the laser welding process of the large-thickness plate is restrained, and quality of a weld joint is improved greatly.

Description

technical field [0001] The invention relates to a welding method, in particular to a laser-friction-stir composite welding method for large-thickness plates. Background technique [0002] Laser welding is one of the most widely used advanced processes in laser processing technology. It has the advantages of small welding heat input, large weld depth-to-width ratio, fast speed, small weld deformation and low residual stress, high welding precision and strength, large penetration depth, It has outstanding advantages such as easy realization of automation, and has been applied in important industries of the national economy such as automobiles, shipbuilding, nuclear power, and pipelines. [0003] In recent years, with the continuous commercialization of high-power fiber lasers, laser welding of medium and thick plates has attracted more and more attention from the industry. However, the flat welded joints of pure laser welded medium and thick plates are prone to defects such a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K28/02B23K20/12B23K26/20
CPCB23K20/12B23K26/20B23K28/02
Inventor 张明军张远康刘子奇戴家辉
Owner CHANGSHA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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