TIG automatic welding technique for titanium alloy thick plate narrow interstice

An automatic welding and welding process technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve the problems of large welding residual stress, wide welding heat affected zone, low welding efficiency, etc., to achieve stable welding process and solve the key problems. Effects of technical issues

Inactive Publication Date: 2008-10-29
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently used in TIG welding of titanium alloy thick plates, large grooves need to be opened when welding large and thick titanium alloy plates, many welding passes, wide welding heat-affected zone, large welding residual stress, large welding deformation, and low welding efficiency etc. These limit the application of TIG welding in the welding of medium and thick plates to a certain extent

Method used

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  • TIG automatic welding technique for titanium alloy thick plate narrow interstice
  • TIG automatic welding technique for titanium alloy thick plate narrow interstice
  • TIG automatic welding technique for titanium alloy thick plate narrow interstice

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1: Butt welding a pair of TA2 plates with a thickness of 20mm, a length of 300mm and a width of 150mm is carried out, the groove form is shown in Figure 5 , the grade of welding wire used is TA2, and the diameter of welding wire is 1.2mm.

[0040] Due to the small thickness of the test plate, only ordinary welding guns are used in the welding process; the thickness of the plate is considered to be small in the design of the groove, and the groove angle is not reserved to ensure that the width of the weld surface is 6-12mm, and the welding process realizes single-layer single-layer Road welding.

[0041] The welding parameters used in the welding process are as follows:

[0042] Position Peak current Pulse time Base current Pulse time Peak voltage Wire feed speed Welding speed

[0043] Primer 160~200 0.1~0.4 30~60 0.1~0.4 10~13 No wire feeding 140~160

[0044] Transition layer 180~240 0.1~0.4 30~60 0.1~0.4 10~13 300~600 70~120

[0045] Middle layer 240~280 0...

Embodiment 2

[0051] Example 2: Carry out butt welding of a pair of Ti75 test plates of 300mm×150mm×100mm, see the groove form Image 6 . The grade of the welding wire used is Ti70, and the diameter of the welding wire is 1.0mm~1.2mm. During the welding process, according to the change of the groove parameters, certain rigid fixing measures are appropriately added to make the welding groove width always meet the requirements of single-layer single-pass welding. It is required that the width of the finally obtained weld surface is less than 12mm.

[0052]Due to the large thickness of the test plate, the groove angle selected in the welding process is small, and the upper and lower groove angles are used. According to the different shrinkage and deformation conditions in different stages of the welding process, the adjustment of the groove angle offsets the shrinkage of the welding process, ensuring The surface width of the weld seam is 6mm to 12mm, realizing single-layer single-pass welding...

Embodiment 3

[0065] Example 3: Carry out butt welding of (φ2289mm~φ2093mm)×400mm two Ti75 alloy rings, the thickness of the weld seam is 98mm, and the form of the welding groove is shown in Figure 7 , The grade of welding wire used is Ti70, and the diameter of welding wire is 1.0mm~1.2mm.

[0066] Due to the double-sided welding groove, the depth of the groove is less than 50mm, and the thickness is small, and only ordinary welding torches are used in the welding process; the groove design takes into account the symmetrical shrinkage of both sides during the welding process, the shrinkage is small, and the welding is performed at different stages. The shrinkage is different, so a small groove angle is reserved, and the upper and lower groove angles are used at the same time to ensure that the weld surface width is 6-12mm, and the welding process realizes single-layer single-pass welding.

[0067] The welding parameters used in the welding process are as follows:

[0068] Position Peak cu...

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Abstract

The invention discloses a narrow clearance TIC automatic welding technique for a thick plate of titanium alloy. The welding technique comprises six items of a welding torch form, a welding line spreading form, a bevel for welding form, selecting the parameters of the welding process, selecting the protection atmosphere of the welding process and eliminating a welding stress adopted by welding process. The welding technique of the invention realizes the narrow clearance welding for the large thick plate of the titanium alloy, has stable welding process, can obtain the welding lines which have no defects, qualified properties and 10mm to 16mm of widths of the welding lines on a cover surface layer, thus solving the key technical problems of the narrow clearance TIC automatic welding for the large thick plate of the titanium alloy, realizing the narrow clearance TIC automatic welding for the thick plate of the titanium alloy and having the advantages of high manufacture efficiency, low manufacture cost, small residual stress and residual deformation of joints, relatively thin and small welding line tissues and good mechanical property of the joints.

Description

technical field [0001] The invention belongs to the field of welding technology, and in particular relates to a narrow-gap TIG automatic welding process for titanium alloy thick plates. Background technique [0002] With the increasingly large-scale and high-parameterization of modern industry and national defense equipment, the application of thick plate and ultra-thick plate welded metal structures is becoming more and more extensive. Narrow gap welding technology has become the preferred technology for welding medium and thick plate structures in modern industrial production. [0003] According to relevant literature, the narrow gap welding of titanium alloys can use low-strength grade welding wire to weld high-strength grade base metals, and through the meshing strengthening effect under narrow gap conditions, a strengthened weld with the same strength as the base metal can be obtained. According to the analysis of materials retrieved from the Internet, there are many ar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/16B23K9/28B23K33/00B23K9/095
Inventor 张建欣刘希林
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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