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Method for diffusion spot welding with solid phase assistance by efficient liquid phase of Al/Mg dissimilar metal

A dissimilar metal, high-efficiency liquid phase technology, applied in metal processing equipment, welding/welding/cutting items, welding equipment, etc., can solve problems such as low strength and difficulty in meeting actual needs

Pending Publication Date: 2019-12-20
NANCHANG HANGKONG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, there is no metallurgical reaction between the chemical glue and the metal substrate, and the combination between them is carried out by physical adsorption. Therefore, the strength is low and it is difficult to meet the actual needs.

Method used

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  • Method for diffusion spot welding with solid phase assistance by efficient liquid phase of Al/Mg dissimilar metal

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Schematic diagram of the diffusion spot welding process as figure 1 As shown, including the first friction head 1 and the second friction head 2 made of H13 steel, an aluminum plate 3 with a thickness of 2mm, a magnesium plate 4 with a thickness of 2mm, and a pure aluminum plate with a thickness of 0.1mm placed between the aluminum plate 3 and the magnesium plate 4 Sn metal foil 5; the first friction head 1 is in contact with the aluminum plate 3 and rotates at high speed, the second friction head 2 is in contact with the magnesium plate 4 and rotates at high speed, the rotation speed is 375r / min, the friction time is 9s, the metal foil 5 Melted into liquid metal; the first friction head 1 and the second friction head 2 squeeze and clamp each other to squeeze out the liquid metal, the relative extrusion amount is 0.8mm, and the holding time of extrusion and clamping is 18s; aluminum plate 3 and magnesium plate 4 Under the action of the clamping force of the first fricti...

Embodiment 2

[0039] Schematic diagram of the diffusion spot welding process as figure 1 As shown, it includes the first friction head 1 and the second friction head 2 made of nickel-based alloy, an aluminum plate 3 with a thickness of 2.5 mm, a magnesium plate 4 with a thickness of 2.5 mm, and a thickness of 0.15 mm between the aluminum plate 3 and the magnesium plate 4. mm Sn90-Zn10 metal foil 5; the first friction head 1 is in contact with the aluminum plate 3 and rotates at a high speed, the second friction head 2 is in contact with the magnesium plate 4 and rotates at a high speed, the rotation speed is 800r / min, and the friction time is 5s. The metal foil 5 is melted into liquid metal; the first friction head 1 and the second friction head 2 squeeze and clamp each other to squeeze out the liquid metal, the relative extrusion amount is 0.6mm, and the holding time of extrusion and clamping is 15s; the aluminum plate 3 The magnesium plate 4 is pressed together under the clamping force of...

Embodiment 3

[0041] Schematic diagram of the diffusion spot welding process as figure 1 As shown, it includes the first friction head 1 and the second friction head 2 made of H13 steel, an aluminum plate 3 with a thickness of 3.5mm, a magnesium plate 4 with a thickness of 3.5mm, and a thickness of 0.05mm placed between the aluminum plate 3 and the magnesium plate 4 Sn85-Zn15 metal foil 5; the first friction head 1 is in contact with the aluminum plate 3 and rotates at a high speed, the second friction head 2 is in contact with the magnesium plate 4 and rotates at a high speed, the rotation speed is 800r / min, and the friction time is 8s. The foil 5 is melted into liquid metal; the first friction head 1 and the second friction head 2 squeeze and clamp each other to squeeze out the liquid metal, the relative extrusion amount is 0.4mm, and the holding time of extrusion and clamping is 10s; the aluminum plate 3 and the The magnesium plate 4 is pressed together under the action of the clamping f...

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Abstract

The invention relates to the technical field of welding of Al / Mg dissimilar materials and specifically relates to a method for diffusion spot welding with solid phase assistance by an efficient liquidphase of Al / Mg dissimilar metal. The method provided by the invention comprises the steps that an Al plate and an Mg plate are rubbed by a friction head to generate heat, a metal foil between the plates is melted by the heat, and an oxidation film on a contact face is cleaned by the molten metal obtained after melting; the liquid metal is then extruded out through extrusion of the friction head;and during maintenance of close adhesion between the Al plate and the Mg plate, atomic diffusion takes place on the cleaned contact face, so diffusion spot welding connection is formed. A welding connector obtained through utilization of the method provided by the invention is a solid diffusion welding head, and a key hole in a welding spot surface is eliminated, so an effective bearing area of the connector is significantly increased; resistance of the spot welding connector to tensile and shear is enhanced; and complicated mechanical equipment and subsequent processes of repair welding are omitted.

Description

technical field [0001] The invention relates to the technical field of aluminum / magnesium dissimilar material welding, in particular to a method for high-efficiency liquid-phase assisted solid-phase diffusion spot welding of aluminum / magnesium dissimilar metals. Background technique [0002] Diffusion welding is to press two workpieces to be welded together, and heat them in a vacuum or protective atmosphere furnace, so that the microscopic unevenness of the two welding surfaces produces microscopic plastic deformation to achieve close contact. During the subsequent heating and heat preservation process, A welding method in which atoms interdiffuse to form a metallurgical connection. The workpiece to be welded is not melted during the welding process, which has great advantages for the welding of dissimilar metals that easily form intermetallic compounds. However, this technology requires high quality of the surface to be welded, the welding time is long, and the quality of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/02B23K20/12
CPCB23K20/026B23K20/122B23K2103/18
Inventor 谢吉林陈玉华张体明黄永德王善林胡锦扬毛育青陈宜
Owner NANCHANG HANGKONG UNIVERSITY
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