Self-nano-structure diffusion welding technique for titanium alloy and stainless steel surface

A diffusion welding and self-nanometer technology, which is applied in welding equipment, metal processing equipment, surface polishing machine tools, etc., can solve the problems of inability to obtain tight welding, no intermediate layer metal, and low performance of welded joints, so as to shorten the welding time , reduce the pressure and temperature requirements, improve the effect of mechanical properties

Inactive Publication Date: 2008-08-20
CHONGQING UNIV
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  • Abstract
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Problems solved by technology

[0008] However, the application of surface self-nanometer treatment to the diffusion welding of titanium alloy and stainless steel has not been reported so far. The shortcomings of titanium alloy and stainless steel diffusion welding can be improved after surface self-nanometer treatment, such as: direct diffusion welding cannot obtain tightly welded joints , the crystal grains are coarse, the joint deformation is large, and a large internal stress is generated, resulting in low performance of the welded joint; indirect welding is not easy to find a suitable intermediate layer metal and there is no suitable process for the shortcomings of the diffusion welding process.

Method used

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  • Self-nano-structure diffusion welding technique for titanium alloy and stainless steel surface
  • Self-nano-structure diffusion welding technique for titanium alloy and stainless steel surface
  • Self-nano-structure diffusion welding technique for titanium alloy and stainless steel surface

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Effect test

Embodiment 1

[0041] Diffusion welding process of titanium alloy and stainless steel surface self-nanoization

[0042] Step 1, preparation of raw materials, select Φ12.5mm×20mm TA1 titanium alloy and 00Cr18Ni10 stainless steel rods as the diffusion welding raw materials, use metallographic sandpaper to smooth the end faces of the raw materials and then polish them to obtain smooth end faces;

[0043] Step 2, surface self-nanometer treatment, put the raw material in step 1 into the shot blasting machine, use high-energy shot peening method to carry out surface self-nanometer treatment on the welding end face of the raw material, and suck the projectile with a diameter of 0.5mm into high pressure under the action of negative pressure The nozzle accelerates the projectile with a high-pressure airflow of 1MPa, impacts the end surface of the raw material to be welded, and the impact time is 1min. Finally, a 40μm deep nanocrystalline grain layer is obtained on the end surface of the raw material t...

Embodiment 2

[0047] Diffusion welding process of titanium alloy and stainless steel surface self-nanoization

[0048] Step 1, preparation of raw materials, select Φ20mm×25mm near α-phase TA17 titanium alloy and 0Cr18Ni9Ti austenitic stainless steel rods as diffusion welding raw materials, use metallographic sandpaper to grind the end faces of raw materials to 1200# and perform mechanical polishing to obtain a smooth finish end face;

[0049] Step 2, surface self-nanometer treatment, put the raw material in step 1 into the shot blasting machine, use high-energy shot peening method to carry out surface self-nanometer treatment on the welding end face of the raw material, titanium alloy or stainless steel use cylindrical fixture in the shot peening process Clip the end to be treated. Inhale a projectile with a diameter of 5mm into a high-pressure nozzle under the action of negative pressure, accelerate the projectile with a high-pressure airflow of 1MPa, and impact the end surface of the raw...

Embodiment 3

[0053] Diffusion welding process of titanium alloy and stainless steel surface self-nanoization

[0054] Step 1, preparation of raw materials, select Φ12.5mm×30mm near α-phase TA17 titanium alloy and 0Cr18Ni9Ti austenitic stainless steel rods as diffusion welding raw materials, use metallographic sandpaper to smooth the end faces of raw materials and then polish them to obtain smooth end face;

[0055] Step 2, surface self-nanometerization treatment, put the raw materials in step 1 into the shot blasting machine, use high-energy shot peening method to carry out surface self-nanometerization treatment on the welding end face of the raw material, and suck the projectile with a diameter of 2.5mm into high pressure under the action of negative pressure The nozzle accelerates the projectile with a high-pressure airflow of 0.7MPa, impacts the end surface of the raw material to be welded, and the impact time is 15 minutes. Finally, a 70 μm deep nanocrystalline grain layer is obtained...

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Abstract

The invention discloses a titanium alloy and stainless steel surface self-nanocrystallization diffusion welding craft; wherein, the same diameter titanium alloy and stainless steel rod are selected; the surface self-nanocrystallization of the end face of the welding terminal is processed; the constant temperature and constant pressure diffusion welding or the impact pressurizing diffusion welding are processed. The titanium alloy and stainless steel surface self-nanocrystallization diffusion welding craft has the advantages of raising the diffusion coefficient of the titanium alloy and stainless steel in the process of diffusion welding, shortening the welding time, raising the welding efficiency, reducing the thickness of intermetallic compounds layer, refining the joint crystalline grain, and raising the mechanical property of the diffusion welding joint of titanium alloy and stainless steel.

Description

technical field [0001] The invention belongs to welding technology, in particular, relates to a technology of diffusion welding of titanium alloy and stainless steel after surface self-nanometerization. Background technique [0002] Titanium alloy has the advantages of low density, high specific strength, excellent corrosion resistance, high temperature strength and low temperature toughness, etc. It has been widely used in aerospace, petrochemical, nuclear power and other fields. However, titanium has low elastic modulus, poor high-temperature creep performance, and is expensive, while stainless steel is cheap and has good thermoelectric and mechanical properties. Therefore, titanium alloys are often used in combination with stainless steel to give full play to both. The complementary advantages of two metal materials in performance and economy. However, there are great differences in physical and chemical properties between titanium alloy and stainless steel. If the weldi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/02B23K20/24B23K20/14B24B29/00B24C1/00
Inventor 盛光敏韩靖胡国雄周小玲颜婧
Owner CHONGQING UNIV
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