Metal bar fast-diffusion welding method based on pulse current treatment

A metal bar, pulse current technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., to avoid extrusion deformation, reduce service life, save time and cost

Inactive Publication Date: 2017-08-29
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But at present, there is no report about the rapid vacuum diffusion welding of dissimilar metals by the pulsed current generated by the spark plasma sintering system.

Method used

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  • Metal bar fast-diffusion welding method based on pulse current treatment
  • Metal bar fast-diffusion welding method based on pulse current treatment

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Rod preparation: Industrial pure titanium TA1 and red copper T1 were hot-rolled at 800°C and 750°C, respectively, so that the diameter of the two bars was 15mm. To release the stress, the rolled industrial pure titanium TA1 and red copper T1 were respectively Annealing is carried out in a vacuum environment at a temperature of 680°Ch and 550°C for 2 hours, so that the average grain sizes of industrially pure titanium TA1 and copper T1 are 20 μm and 50 μm, respectively, and are cut by wire cutting to make the two rods The length of the material is 15mm. Subsequently, the two ends of the bar are polished with 360#, 600#, 800#, 1000#, 1500#, 2000# sandpaper, polished with 1.5μm, 1.0μm, 0.5μm diamond polishing agent, and finally soaked in acetone for ultrasonic cleaning For 20 minutes, ensure that the surface of the bar is clean and has a metallic luster, and ensure that the roughness of the end surface of the bar is less than 0.5 μm.

[0030] (2) Assembly: such as fi...

Embodiment 2

[0034] (1) Rod preparation: Industrial pure titanium TA1 and red copper T1 were hot-rolled at 800°C and 750°C, respectively, so that the diameter of the two bars was 15mm. To release the stress, the rolled industrial pure titanium TA1 and red copper T1 were respectively Annealing is carried out in a vacuum environment at a temperature of 680°Ch and 550°C for 2 hours, so that the average grain sizes of industrially pure titanium TA1 and copper T1 are 20 μm and 50 μm, respectively, and are cut by wire cutting to make the two rods The length of the bar is 15mm; then, the two ends of the bar are polished with 360#, 600#, 800#, 1000#, 1500#, 2000# sandpaper, and polished with 1.5μm, 1.0μm, 0.5μm diamond polishing agent, Finally, soak in acetone and ultrasonically clean for 20 minutes to ensure that the surface of the bar is clean and has a metallic luster, and that the roughness of the end surface of the bar is less than 0.5 μm.

[0035] (2) Assembly: such as figure 1 shown. One ...

Embodiment 3

[0039] (1) Rod preparation: Industrial pure titanium TA1 and red copper T1 were hot-rolled at 800°C and 700°C, respectively, so that the diameters of the two bars were both 15mm. In order to release stress, the rolled industrial pure titanium TA1 and red copper T1 were respectively Annealing was carried out in a vacuum environment at a temperature of 650°C and 600°C for 1.8 hours, so that the average grain sizes of industrially pure titanium TA1 and copper T1 were 18 μm and 50 μm, respectively, and were cut by wire cutting to make the two rods The length is 15mm; then, the two ends of the bar are polished with 360#, 600#, 800#, 1000#, 1500#, 2000# sandpaper, and polished with 1.5μm, 1.0μm, 0.5μm diamond polishing agent, and finally Perform acetone immersion ultrasonic cleaning for 18 minutes to ensure that the surface of the bar is clean and has a metallic luster, and the roughness of the end surface of the bar is ensured to be less than 0.5 μm.

[0040] (2) Assembly: such as ...

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Abstract

The invention belongs to a connecting method of a dissimilar metal material and discloses a metal bar fast-diffusion welding method based on pulse current treatment. The welding method comprises the steps that end faces of metal bars of two different materials make contact and are arranged in a graphite die cavity, and the other end faces of the metal bars are connected with a graphite punch pin. An equipped die is arranged in a spark plasma sintering system, then pressure is exerted on the graphite punch pin, meanwhile, pulse currents flow through the two metal materials through the graphite punch pin from top to bottom, the contact end faces of the two metal bars will react, under the effect of vacuum conditions and pulse currents, a new diffusion layer is generated, the two metal bars form good metallurgical bonding, and reliable connection is obtained. Compared with conventional vacuum diffusion welding, time needed by pulse current diffusion welding is short, thus, the production efficiency is improved, and time cost is saved.

Description

technical field [0001] The invention belongs to a connection method of dissimilar metal materials, in particular to a method for rapid diffusion welding of metal rods based on pulse current treatment. Background technique [0002] Vacuum diffusion welding is a precise connection method that relies on the interdiffusion of interface atoms to achieve reliable bonding of the base materials on both sides in a vacuum environment after a certain period of heat preservation at a certain temperature and pressure. It is a solid-state connection. It is mainly used for the connection of dissimilar metal materials, ceramics, intermetallic compounds, and composite materials that are difficult to weld by traditional fusion welding methods. In recent years, diffusion bonding technology has been used in aerospace, instrumentation and electronics, nuclear industry, automobile manufacturing and other departments. However, conventional vacuum diffusion welding requires a long holding time, wh...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/00B23K20/14
CPCB23K20/001B23K20/002B23K20/14
Inventor 杨超莫达光屈盛官李小强张卫文
Owner SOUTH CHINA UNIV OF TECH
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