A kind of electron beam welding method of bti6431s high temperature titanium alloy material

A high-temperature titanium alloy, electron beam welding technology, applied in electron beam welding equipment, welding equipment, metal processing equipment and other directions, can solve the problems of large deformation of components, decreased mechanical properties of welds, and high melting point of titanium alloys, to prevent oxidation and The effect of element burning, reducing weld porosity, and modifying weld surface

Active Publication Date: 2020-12-08
BEIJING HANGXING MACHINERY MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Titanium alloy has the characteristics of high melting point, small heat capacity, and poor thermal conductivity. The heat input of argon arc welding is large, the deformation of the components during the welding process is large, and a large number of cracks are prone to occur. Severe coarsening leads to a decrease in the mechanical properties of the weld
Laser welding has the advantages of controllable welding heat input, small heat-affected zone, fast welding speed, high welding efficiency, and small welding deformation. The limitation of laser power makes it difficult to realize the welding of high-temperature titanium alloy materials with large thickness

Method used

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  • A kind of electron beam welding method of bti6431s high temperature titanium alloy material
  • A kind of electron beam welding method of bti6431s high temperature titanium alloy material
  • A kind of electron beam welding method of bti6431s high temperature titanium alloy material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] 2mm thick BTi6431S high temperature titanium alloy flat plate butt welding. as attached figure 2 As shown, the joint structure is in the form of butt joint. The specific welding process such as figure 1 shown.

[0054] 1) Cleaning before welding, degreasing, pickling, drying, grinding and scraping of BTi6431S high temperature titanium alloy plate;

[0055] 2) Assemble, fix the titanium alloy plate firmly, ensure that the maximum butt gap of the weld is not greater than 0.15mm, and the step difference is not greater than 10% of the base metal thickness;

[0056] 3) Put the assembled BTi6431S alloy plate into the vacuum chamber and vacuumize, the vacuum degree of the vacuum chamber is 2×10 - 2 Pa;

[0057] 4) When the vacuum degree meets the requirements, call the NC program and use a small electron beam current (2~4mA) to teach the welding seam trajectory. The teaching process ensures that the electron beam spot is always in the middle of the weld;

[0058] 5) P...

Embodiment 2

[0064] 3mm thick BTi6431S alloy flat plate butt welding. as attached figure 2 As shown, the joint structure is in the form of butt joint.

[0065] 1) Cleaning before welding, degreasing, pickling, drying, grinding and scraping of BTi6431S high temperature titanium alloy plate;

[0066] 2) Assemble, fix the titanium alloy plate firmly, ensure that the maximum butt gap of the weld is not greater than 0.15mm, and the step difference is not greater than 10% of the base metal thickness;

[0067] 3) Put the assembled BTi6431S alloy plate into the vacuum chamber and vacuumize, the vacuum degree of the vacuum chamber is 2×10 - 2 Pa;

[0068] 4) When the vacuum degree meets the requirements, call the NC program and use a small electron beam current (2~4mA) to teach the welding seam trajectory. The teaching process ensures that the electron beam spot is always in the middle of the weld;

[0069] 5) Perform uniform tack welding on the workpiece along the welding seam. The welding ...

Embodiment 3

[0075] 10mm thick BTi6431S high temperature titanium alloy flat plate butt welding. as attached figure 2 As shown, the joint structure is in the form of butt joint.

[0076] 1) Cleaning before welding, degreasing, pickling, drying, grinding and scraping of BTi6431S high temperature titanium alloy plate;

[0077] 2) Assemble, fix the titanium alloy plate firmly, ensure that the maximum butt gap of the weld is not greater than 0.15mm, and the step difference is not greater than 10% of the base metal thickness;

[0078] 3) Put the assembled BTi6431S alloy plate into the vacuum chamber and vacuumize, the vacuum degree of the vacuum chamber is 2×10 - 2 Pa;

[0079] 4) When the vacuum degree meets the requirements, call the NC program and use a small electron beam current (2~4mA) to teach the welding seam trajectory. The teaching process ensures that the electron beam spot is always in the middle of the weld;

[0080] 5) Perform uniform tack welding on the workpiece along the...

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Abstract

The invention discloses an electron beam welding method for a BTi6431S high temperature titanium alloy material, and belongs to the technical field of electron beam welding. According to the method disclosed by the invention, a butt joint of a workpiece to be welded is fixed and placed in a vacuum environment, and the positioning welding, formal welding and modified welding are sequentially performed. Due to the use of vacuum electron beam welding BTi6431S high temperature titanium alloy material, the energy is concentrated during welding, the heat input is small, the heat affected zone is small, the welding deformation is small, and meanwhile, the vacuum environment can effectively prevent weld oxidation and element burning, and the GJB1718A-2005 standard Class I weld requirements are met. The weld cross section is in a funnel shape. The average tensile strength of the BTi6431S high temperature titanium alloy joint is not less than 1225MPa, and is 90% or more higher than the strengthof a parent material, and the elongation after fracture is not less than 10%.

Description

technical field [0001] An electron beam welding method for BTi6431S high temperature titanium alloy material belongs to the technical field of electron beam welding. 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 puts forward higher requirements for the high temperature resistance of structural materials. High-temperature titanium alloys have become an important structural material in the aerospace field due to their high specific strength, excellent corrosion resistance, good thermal strength, workability and weldability. In recent years, the development of high-temperature titanium alloys above 600 ℃ has become the research focus of scholars from all over the world. BTi6431S titanium alloy is a Ti-Al-Sn-Zr-Mo-Nb-W-Si α+β type high temperature titanium alloy with high aluminum content, which is independently designed and developed by ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K15/00B23K15/06
CPCB23K15/0053B23K15/06
Inventor 孙少波任金欣王毅李保永李宏伟
Owner BEIJING HANGXING MACHINERY MFG CO LTD
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