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Electron beam welding method for TA15 and Ti60 dissimilar titanium alloy materials

A technology of electron beam welding and titanium alloy, which is applied in the direction of electron beam welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of reducing material toughness, difficulty in welding large thickness titanium alloy materials, and prone to oxidation on the alloy surface. Achieve the effects of reducing deformation during welding, avoiding alloy oxidation and element burning, and excellent mechanical properties

Pending Publication Date: 2021-04-20
BEIJING HANGXING MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when laser welding titanium alloy, the surface of the alloy is prone to oxidation, which leads to the formation of defects such as pores and oxides, and reduces the toughness of the material.
At the same time, due to the limitation of laser power, it is difficult to realize the welding of large thickness titanium alloy materials

Method used

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  • Electron beam welding method for TA15 and Ti60 dissimilar titanium alloy materials
  • Electron beam welding method for TA15 and Ti60 dissimilar titanium alloy materials
  • Electron beam welding method for TA15 and Ti60 dissimilar titanium alloy materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Butt welding of 2mm thick TA15 and Ti60 dissimilar titanium alloy plates. Such as figure 2 As shown, the structural form of the joint is a butt joint form, wherein, the number 1-welding base metal, 2-weld to be welded, 3-weld pool, 4-electron beam current. Specific welding process such as figure 1 shown.

[0048] Step (1), cleaning before welding, degreasing, pickling, drying, grinding and scraping the TA15 and Ti60 dissimilar titanium alloy plates;

[0049] Step (2), assembling, fixing the titanium alloy plate firmly, ensuring that the maximum butt joint gap of the weld is not greater than 0.15mm, and the step difference is not greater than 10% of the base metal thickness;

[0050] Step (3), put the assembled TA15 and Ti60 titanium alloy plates into the vacuum chamber and vacuumize, the vacuum degree of the vacuum chamber is 2×10 -2 Pa;

[0051] Step (4), when the vacuum degree meets the requirements, call the NC program and use a small electron beam current (2-4...

Embodiment 2

[0058] Butt welding of 3mm thick TA15 and Ti60 dissimilar titanium alloy plates. Such as figure 2 As shown, the structural form of the joint is a butt joint form.

[0059] Step (1), cleaning before welding, degreasing, pickling, drying, grinding and scraping of TA15 and Ti60 dissimilar titanium alloy plates

[0060] Step (2), assembling, fixing the titanium alloy plate firmly, ensuring that the maximum butt joint gap of the weld is not greater than 0.15mm, and the step difference is not greater than 10% of the base metal thickness;

[0061] Step (3), put the assembled TA15 and Ti60 alloy plates into the vacuum chamber and vacuumize, the vacuum degree of the vacuum chamber is 2×10 -2 Pa;

[0062] In step (4), when the degree of vacuum meets the requirements, the NC program is invoked, and a small electron beam current (2-4mA) is used to teach the weld trajectory. The teaching process ensures that the electron beam spot is always in the middle of the weld;

[0063] In step...

Embodiment 3

[0069] Butt welding of 10mm thick TA15 and Ti60 dissimilar titanium alloy plates. Such as figure 2 As shown, the structural form of the joint is a butt joint form.

[0070] Step (1), cleaning before welding, degreasing, pickling, drying, grinding and scraping the TA15 and Ti60 dissimilar titanium alloy plates;

[0071] Step (2), assembling, fixing the titanium alloy plate firmly, ensuring that the maximum butt joint gap of the weld is not greater than 0.15mm, and the step difference is not greater than 10% of the base metal thickness;

[0072] Step (3), put the assembled TA15 and Ti60 alloy plates into the vacuum chamber and vacuumize, the vacuum degree of the vacuum chamber is 2×10 -2 Pa;

[0073] In step (4), when the degree of vacuum meets the requirements, the NC program is invoked, and a small electron beam current (2-4mA) is used to teach the weld trajectory. The teaching process ensures that the electron beam spot is always in the middle of the weld;

[0074] In ste...

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Abstract

The invention provides an electron beam welding method for TA15 and Ti60 dissimilar titanium alloy materials. The electron beam welding method for the TA15 and Ti60 dissimilar titanium alloy materials comprises the following steps: a butt joint of a workpiece to be welded is fixed, and placed in a vacuum environment; positioned welding is carried out, wherein the parameters of the positioned welding are as follows: the length of each section of a weld joint is 20-25mm, the working distance is 400mm, the acceleration voltage is 50-60kV, the focusing current surface focus is +(0.01-0.03)A, the welding beam current is 10-25mA, and the welding speed is 600-800mm / min; formal welding is carried out, wherein the parameters of the formal welding are as follows: the working distance is 400 mm, the acceleration voltage is 50-60 kV, the focusing current surface focus is (-0.01 to +0.02) A, the electron beam current is 40-85 mA, and the welding speed is 600-800 mm / min; modified welding is carried out, wherein the parameters of the modified welding are as follows: the working distance is 400mm, the acceleration voltage is 50-60kV, the focusing current surface focus is +(0.02-0.04) A, the electron beam current is 30-50mA, and the welding speed is 600-800mm / min; and vacuum cooling and postwelding cleaning are carried out. According to the invention, the weld joint formed by welding is continuous, uniform and good in forming, defects such as air holes and cracks are avoided, and excellent mechanical property of the weld joint is achieved.

Description

technical field [0001] The invention belongs to the technical field of electron beam welding, in particular to an electron beam welding method for TA15 and Ti60 dissimilar titanium alloy materials. Background technique [0002] With the rapid development of my country's aerospace industry, the requirements for the technical indicators of aircraft are getting higher and higher, which requires higher and higher comprehensive performance of structural materials. Titanium alloy has become an important structural material in the aerospace field because of its high specific strength, excellent corrosion resistance, good heat strength and weldability. Among them, Ti60 is a new 600°C high-temperature titanium alloy developed by Beijing Institute of Aeronautical Materials, which belongs to the Ti-Al-Sn-Zr-Mo-Si near-α system. The alloy has excellent creep resistance, fatigue strength and damage tolerance performance at a temperature of 600°C, and is suitable for manufacturing hot en...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K15/06B23K15/00
Inventor 任金欣王志敏孙少波王毅李宏伟武俊飞陈久友陈浩
Owner BEIJING HANGXING MACHINERY MFG CO LTD
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