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Magnetic control TIG (Tungsten Inert Gas) welding process for narrow gap of thick plate titanium alloy

A welding process, titanium alloy technology, applied in the direction of welding medium, welding equipment, welding equipment, etc., can solve the problems of TIG welding application, large residual stress and deformation, low welding efficiency and other problems that limit the application range of thick plate titanium alloy, and achieve excellent The effect of mechanical properties, large welding current and stable welding process

Inactive Publication Date: 2012-07-25
HARBIN INST OF TECH AT WEIHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, the biggest problem of narrow gap welding is the problem of side wall fusion, and the number of welding passes is affected by the current carrying capacity of the tungsten electrode, the welding heat affected zone is wide, and the welding efficiency is low.
In conventional welding of thick plate titanium alloy, the groove area is large, the filler metal is large, the residual stress and deformation after welding are large, and the welding efficiency is low
It greatly limits the scope of application of thick plate titanium alloys and the application of TIG welding

Method used

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  • Magnetic control TIG (Tungsten Inert Gas) welding process for narrow gap of thick plate titanium alloy
  • Magnetic control TIG (Tungsten Inert Gas) welding process for narrow gap of thick plate titanium alloy
  • Magnetic control TIG (Tungsten Inert Gas) welding process for narrow gap of thick plate titanium alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Example 1: Perform butt welding of a pair of TC4 plates with a thickness of 60mm, a length of 325mm and a width of 130mm. See the groove form Image 6 Because of the mesh strengthening effect of the titanium alloy itself, TA2, which is far inferior to the base material, is used as the welding wire, and the diameter of the welding wire is 3.5mm.

[0035] In the groove design, in order to ensure that the bottom welding can be penetrated without penetration, the assembly gap is 1mm, and the thickness of the blunt edge is 2mm. In accordance with the continuous occurrence of welding deformation during the welding process, the opening angle of the welding groove is 20° to ensure that the welding gun can extend into the lower end of the groove during the welding process. Single-pass multi-layer welding is realized in the welding process.

[0036] The welding parameters used in the welding process are as follows:

[0037] position Current Voltage Wire feeding speed Welding speed...

Embodiment 2

[0041] Example 2: Perform butt welding of a pair of TA15 plates with a thickness of 60mm, a length of 325mm and a width of 130mm. See the groove form Figure 7 Because of the mesh strengthening effect of the titanium alloy itself, TA2, which is slightly worse than the base material, is used as the welding wire, and the diameter of the welding wire is 3.5mm.

[0042] With I-shaped groove, the backing plate and the bottom must be welded before welding. In accordance with the continuous occurrence of welding deformation during the welding process, the opening angle of the welding groove is 10° to ensure that the welding gun can extend into the lower end of the groove during the welding process. Single-pass multi-layer welding is realized in the welding process.

[0043] The welding parameters used in the welding process are as follows:

[0044] position Current Voltage Wire feeding speed Welding speed Magnetic field frequency Magnetic field strength Bottom welding90-4509.5-15.54...

Embodiment 3

[0048] Example 3: Perform butt welding of a pair of TA4 plates with a thickness of 60mm, a length of 325mm and a width of 130mm. See the groove form Figure 8 Because of the mesh strengthening effect of the titanium alloy itself, TA2, which is far inferior to the base material, is used as the welding wire, and the diameter of the welding wire is 3.5mm.

[0049] In the groove design, in order to ensure the penetration of the bottom welding without welding penetration, the assembly gap is 2mm and the thickness of the blunt edge is 2.5mm. In accordance with the continuous occurrence of welding deformation during the welding process, the opening angle of the welding groove is 10° to ensure that the welding gun can extend into the lower end of the groove during the welding process. Single-pass multi-layer welding is realized in the welding process.

[0050] The welding parameters used in the welding process are as follows:

[0051] position Current Voltage Wire feeding speed Welding ...

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Abstract

The invention discloses a TIG (Tungsten Inert Gas) welding process for a narrow gap of a thick plate titanium alloy, which comprises six items adopted in the welding process, namely form of a welding gun, welding line spreading form, form of a welding groove, locking form before welding, selection of welding engineering parameters and selection of protective atmosphere in the welding process. The welding process solves the technical problem of the automatic TIG welding process for the narrow gap of the thick plate titanium alloy, realizes automatic TIG welding of the narrow gap of the thick plate titanium alloy, and has the characteristics of less time of weld beads, narrow heat affected zone and high welding efficiency. The residual stress and residual deformation of the welding joint are small, the weld structure is fine, and the welding performance is high.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a narrow-gap magnetron TIG welding process of thick-plate titanium alloy. Background technique [0002] As the third metal, titanium and its alloys are becoming ideal metal structural materials due to their advantages of high specific strength, good thermal strength, corrosion resistance and good biocompatibility, and have been widely used in aviation, aerospace, automobiles, etc. , Shipbuilding, biomedicine and other fields, its connection technology has also become an important topic in the engineering field. In view of the problems encountered in the connection process of thick plate titanium alloys, researchers have proposed many solutions, but the core problem is still the quality of side wall fusion. At present, its welding methods include tungsten electrode argon arc welding (TIG), gas metal arc welding, electron beam welding, plasma arc welding and laser wel...

Claims

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Application Information

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IPC IPC(8): B23K9/167B23K9/08B23K35/04B23K33/00B23K103/14
Inventor 孙清洁袁新蔡春伟冯吉才胡海峰姜云禄黄海艇
Owner HARBIN INST OF TECH AT WEIHAI
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