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Titanium alloy friction stir welding stirring head and welding method thereof

A friction stir welding and titanium alloy technology, which is applied in welding equipment, welding/welding/cutting items, non-electric welding equipment, etc. It can solve the problem of unclear welding method of stirring head, and achieve excellent mechanical properties, controllable structure, and use. long life effect

Inactive Publication Date: 2018-02-02
BEIJING INSTITUTE OF TECHNOLOGYGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, titanium alloy friction stir welding is mainly aimed at titanium alloy plates with a thickness of 2-3mm. For the welding of thicker titanium alloy plates, the stirring head and its welding method are still unclear

Method used

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  • Titanium alloy friction stir welding stirring head and welding method thereof
  • Titanium alloy friction stir welding stirring head and welding method thereof
  • Titanium alloy friction stir welding stirring head and welding method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] In this embodiment, the titanium alloy plate 8 is Ti-6Al-4V with a thickness of 4.3 mm. The material of the stirring head 9 is W-Re alloy, the diameter of the shaft shoulder 2 is 25mm, the length of the stirring needle 3 is 4.2mm, the diameter of the root of the stirring needle 3 is 8.5mm, the diameter of the top is 5mm, and the depth of the annular groove 5 is 0.6mm. The width is 0.8 mm; the depth of the spiral groove 4 is 0.8 mm, and the width is 1.5 mm.

[0039] The welding process described in the present embodiment is as follows:

[0040] (1) Drilling a preset hole: before welding, punch a preset hole with a diameter of 7mm and a depth of 3mm on the titanium alloy plate 8, and the preset hole is located at the place where the stirring head 9 is screwed in.

[0041] (2) Fixing the titanium alloy plate: Clean the titanium alloy plate 8 with alcohol to ensure the cleanliness of the titanium alloy plate 8, fix the tungsten alloy backing plate 10 through the pad II12 o...

Embodiment 2

[0047] In this embodiment, the titanium alloy plate 8 is Ti-6Al-4V with a thickness of 5 mm. The material of the stirring head 9 is W-Re alloy, the diameter of the shaft shoulder 2 is 20mm, the length of the stirring needle 3 is 4.7mm, the diameter of the root of the stirring needle 3 is 8.5mm, the diameter of the top is 5mm, and the depth of the annular groove 5 is 0.8mm. The width is 1 mm; the depth of the spiral groove 4 is 1 mm, and the width is 1.5 mm.

[0048] The welding process described in the present embodiment is as follows:

[0049] (1) Drilling a preset hole: punch a preset hole with a diameter of 7 mm and a depth of 4.5 mm on the titanium alloy plate 8 before welding, and the preset hole is located at the place where the stirring head 9 is screwed in.

[0050] (2) Fixing the titanium alloy plate: Clean the titanium alloy plate 8 with alcohol to ensure the cleanliness of the titanium alloy plate 8, fix the tungsten alloy backing plate 10 through the pad II12 on t...

Embodiment 3

[0056] In this embodiment, the titanium alloy plate 8 is Ti-6Al-4V with a thickness of 5 mm. The material of the stirring head 9 is W-Re alloy, the diameter of the shaft shoulder 2 is 20mm, the length of the stirring needle 3 is 4.7mm, the diameter of the root of the stirring needle 3 is 8.5mm, the diameter of the top is 5mm, and the depth of the annular groove 5 is 0.8mm. The width is 1 mm; the depth of the spiral groove 4 is 1 mm, and the width is 1.5 mm.

[0057] The welding process described in the present embodiment is as follows:

[0058] (1) Drilling a preset hole: punch a preset hole with a diameter of 7 mm and a depth of 4.5 mm on the titanium alloy plate 8 before welding, and the preset hole is located at the place where the stirring head 9 is screwed in.

[0059] (2) Fix the plate to be welded: clean the titanium alloy plate 8 with alcohol to ensure the cleanliness of the titanium alloy plate 8, fix the tungsten alloy backing plate 10 through the pad II12 on the wo...

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Abstract

The invention relates to the field of welding of a titanium alloy, in particular to a titanium alloy friction stir welding stirring head and a welding method thereof. The stirring head comprises a clamping part, a shaft shoulder and a stirring needle and is characterized in that the stirring needle is located below the shaft shoulder, the stirring needle is of a conical structure with the large upper and the small lower, and an annular groove is formed in the outer wall of the stirring needle; the stirring head is used for welding of the titanium alloy board of 4 mm to 10 mm. The stirring headis made of a W-Re alloy and has the wear resistance. According to the welding head, the rotating speed and the welding speed are controlled, the microscopic structure of the welding seam can be controlled, the aim of being capable of controlling the structure is achieved, and after welding, the obtained welding seam has the excellent mechanical property.

Description

technical field [0001] The invention relates to the field of titanium alloy welding, in particular to a titanium alloy friction stir welding stirring head and a welding method thereof. Background technique [0002] Titanium alloy has the advantages of corrosion resistance, high specific stiffness, good high-temperature mechanical properties, good fatigue resistance and creep properties, and has excellent comprehensive mechanical properties. It has been widely used in aerospace, power generation, offshore oil and gas production and weapons. The application in biological field, sporting goods field and automobile field is also very broad. Therefore, its connection technology has received extensive attention. However, titanium alloy is easy to interact with oxygen, nitrogen, and hydrogen at high temperature, which seriously reduces its plasticity and toughness. During the fusion welding process, the weldment is deformed greatly, and the weld is prone to defects such as pores, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/233B23K20/24
CPCB23K20/1245B23K20/233B23K20/24B23K2103/14
Inventor 杨素媛鲍佳伟程兴旺王扬卫杨婷
Owner BEIJING INSTITUTE OF TECHNOLOGYGY
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