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Friction stir welding method of cold-sprayed Ti coating assisted aluminium-steel dissimilar metal lap joint

A technology of friction stir welding and dissimilar metals, applied in the direction of metal processing equipment, welding/welding/cutting items, welding equipment, etc., can solve the problems of IMCs, thermal cracks, etc., achieve simple spraying and welding process, prevent direct contact reaction, Easy to automate effects

Inactive Publication Date: 2019-06-28
SICHUAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the current FMB aluminum-steel lap welding problems such as IMCs and thermal cracks, the present invention proposes to use cold-sprayed Ti as the intermediate layer of the aluminum-steel friction stir welding lap to solve the IMCs and thermal cracks at the aluminum-steel joint interface And other issues

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  • Friction stir welding method of cold-sprayed Ti coating assisted aluminium-steel dissimilar metal lap joint
  • Friction stir welding method of cold-sprayed Ti coating assisted aluminium-steel dissimilar metal lap joint
  • Friction stir welding method of cold-sprayed Ti coating assisted aluminium-steel dissimilar metal lap joint

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Embodiment Construction

[0025] The present invention will be further described below in conjunction with the above-mentioned optimized process parameters, but the present invention is not limited thereby.

[0026] Such as Figure 1a with Figure 1b , using the cold spraying process, select Ti powder with an average particle size of 20 μm, the pressure and temperature of nitrogen are 2.8MPa and 500°C, respectively, and the spraying distance is 30mm, and a layer of Ti coating is deposited on the Al2024 substrate. The steel substrate was fixed above the middle of the Ti coating, and the friction stir welding lap process was carried out. The pressing force of the stirring head was 100 μm, and the rotation speed was 2000 rpm.

[0027] The cold-sprayed Ti-assisted friction stir welding lap joint process of aluminum-steel dissimilar metals adopted in the present invention has no obvious IMCs and thermal cracks at the joint interface, such as Figure 2a with Figure 2b , indicating that Ti coating can be u...

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Abstract

The invention relates to the technical field of friction stir welding, in particular to a friction stir welding method of cold-sprayed Ti coating assisted aluminium-steel dissimilar metal lap joint. The friction stir welding method comprises the following steps of removing oil stain and impurities on the surface of an Al2O24 substrate to be sprayed and the surface of a low-carbon steel to be welded; cleaning and coarsening oxides on the surface of the Al2O24 substrate; depositing a Ti coating on the Al2O24 substrate; milling the Ti coating to obtain a Ti coating which has a certain thickness and a smooth surface; forming a lap joint connector that a steel substrate is at the upper part, the Ti coating is in the middle, and an aluminium substrate is at the lower part; and performing friction stir welding lap joint. The Ti middle layer is cold-sprayed on the surface of the aluminium substrate, solid-phase connection is generated in the friction stir process of a needle-free stirring headon the surface of steel so as to prevent direct contact and reaction of aluminium and steel and completely inhibit generation of IMCs and hot cracks, the spraying and welding process is simple, the wire welding or spot welding of aluminium-steel plates of different sizes is realized, and the automation is easily realized.

Description

technical field [0001] The invention relates to the technical field of friction stir welding, in particular to a friction stir welding method for lapping aluminum-steel dissimilar metals assisted by a cold-sprayed Ti coating. Background technique [0002] The integrated design of advanced multi-metal materials is of great significance to support the low carbonization and light weight of the key development direction of the future automobile industry. In particular, the aluminum-steel dissimilar metal integrated body connection has become a key technology for the modern automobile industry to manufacture green, lightweight, and high-performance composite component materials. 2 It plays an important role in gas emission, energy saving and maintaining high strength and light weight of the car body. [0003] However, the application of a lightweight aluminum-steel integrated body structure puts forward huge requirements on the existing welding process while realizing the weight...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K103/20
Inventor 黄春杰赵吕张磊刘剑
Owner SICHUAN UNIV
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