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Electric resistance welding method for filling holes of laminated structure of molybdenum filter screen with titanium powder

A layer structure, filter screen stacking technology, applied in resistance welding equipment, welding equipment, metal processing equipment and other directions, can solve the problems of low welding joint strength, reducing the strength of wire mesh welding joints, and difficulty in welding molybdenum filter screen, etc. The effect of high joint strength

Active Publication Date: 2019-08-16
XI AN JIAOTONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the particularity of the layered structure and periodic distribution of the wire mesh, the original structure of the wire mesh will be destroyed by traditional fusion welding, but high-strength connections cannot be formed, which greatly reduces the strength of the wire mesh welded joints; continuous welding cannot be formed by traditional resistance welding. Seam, welded joint strength is low
[0007] However, the welding problem of molybdenum filter screen, a material with a high melting point, is more difficult, and no scholars have carried out research work.

Method used

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  • Electric resistance welding method for filling holes of laminated structure of molybdenum filter screen with titanium powder
  • Electric resistance welding method for filling holes of laminated structure of molybdenum filter screen with titanium powder
  • Electric resistance welding method for filling holes of laminated structure of molybdenum filter screen with titanium powder

Examples

Experimental program
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Effect test

Embodiment 1

[0051] Take the lap resistance welding of pure molybdenum mesh with a mesh number of 125 as an example, such as Figure 2aThe welding process is as follows: 1) Polish the cooling plate 2 with 80# sandpaper, 600# sandpaper and 1000# sandpaper in sequence, then wipe it with acetone, and dry it for later use; 2) Spread Ti powder 4 on the cooling plate 2 On the bottom plate, the laying area is larger than the electrode diameter 6mm, the area to be welded of the two layers of molybdenum wire mesh is placed on the Ti powder 4, and then the Ti powder 4 is laid on the welding area of ​​the molybdenum wire; 3) the radiator plate The cover plate of 2 is stacked on the molybdenum wire mesh to ensure that the bottom plate of the heat sink 2, the molybdenum wire mesh to be welded, the Ti powder 4 and the cover plate of the heat sink 2 are tightly bonded, and the resistance welding is carried out. The welding pressure is 600kg, and the power-on time is 0.2s, the electrode voltage is 7.3V, a...

Embodiment 2

[0055] Take the lap resistance welding of pure molybdenum mesh with a mesh number of 125 as an example, such as Figure 2a As shown; the welding process is: 1) Polish the copper radiator plate 2 with 80# sandpaper, 600# sandpaper and 1000# sandpaper in sequence, then wipe it with acetone, and dry it for later use; 2) Spread Ti powder 4 on the radiator plate 2, the laying area is larger than the electrode diameter 6mm, the area to be welded of the three-layer molybdenum wire mesh is placed on the Ti powder 4, and then the Ti powder 4 is laid on the area to be welded of the molybdenum wire; 3) the The cover plate of the heat sink 2 is stacked on the molybdenum wire mesh to ensure that the bottom plate of the heat sink 2, the molybdenum wire mesh to be welded, the Ti powder 4 and the cover plate of the heat sink 2 are tightly bonded, and resistance welding is performed. The welding pressure is 600kg, and the power-on time 0.2s, the electrode voltage is 7.3V, and the actual passin...

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Abstract

The invention discloses an electric resistance welding method for filling holes of a laminated structure of a molybdenum filter screen with titanium powder. The electric resistance welding method includes the following steps: 1) cleaning the multilayer molybdenum filter screen to be welded; 2) placing the multilayer molybdenum filter screen on a base plate of a heat dissipating plate, and spreading the titanium powder on a to-be-welded area of the multilayer molybdenum filter screen to be welded; 3) overlaying a cover plate of the heat dissipating plate on the multilayer molybdenum filter screen to be welded; 4) blowing argon to the to-be-welded area, connecting a welding electrode to welding current to allow the titanium powder to generate electrical resistance heat, and under the combined action of the electrical resistance heat and the upsetting pressure of the welding electrode, achieving the metallurgical bonding between the titanium powder and between the titanium powder and metal wires in the multilayer molybdenum filter screen, so as to achieve the lap joint between the layers of the multilayer molybdenum filter screen to obtain a sample; and 5) removing the titanium powdernot fused in the welded area on the sample. The electric resistance welding method can achieve the lap joint welding of the molybdenum filter screen, with high lap joint strength.

Description

technical field [0001] The invention belongs to the field of welding technology, and relates to a molybdenum filter net lamination structure hole embedded titanium powder resistance welding method. Background technique [0002] Molybdenum is a refractory metal with a high melting point. Because of its excellent properties such as high temperature resistance, high specific strength, high specific modulus, and low thermal expansion coefficient, the molybdenum wire manufactured by it is processed by weaving process. Metal mesh is very suitable for making high-performance antenna reflectors, heat-treated molybdenum mesh grids for new vacuum furnaces, heat-treated mesh, and strong magnetic sintering and other heat-bearing components. However, because molybdenum is a hard and brittle material in nature, its weldability is extremely poor. Moreover, the layered structure and periodic distribution of the wire mesh make the welding process more difficult: there are many wire mesh stru...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K11/20B23K11/16B23K11/00
CPCB23K11/002B23K11/163B23K11/20
Inventor 张林杰马茹原张亮亮郭潜王梣鸿张延斌孙旭尚香涛杨白钰
Owner XI AN JIAOTONG UNIV