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Welding method for heterogeneous titanium alloy T-shaped joint

A welding method and titanium alloy technology, applied in welding equipment, welding/welding/cutting items, arc welding equipment, etc., can solve problems such as increasing the difficulty of welding beta titanium alloys, reduce root cleaning and grinding and other processes, reduce Temperature gradient, effect of promoting metallurgical reactions

Active Publication Date: 2021-12-21
JIANGSU UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the welding process of dissimilar titanium alloys, the welding parameters vary widely. For example, compared with α and α+β titanium alloys, β titanium alloys are more sensitive to gas impurities and cooling speed during welding. Increased the difficulty of welding β titanium alloys with other types of titanium alloys

Method used

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  • Welding method for heterogeneous titanium alloy T-shaped joint
  • Welding method for heterogeneous titanium alloy T-shaped joint
  • Welding method for heterogeneous titanium alloy T-shaped joint

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] A method for welding a heterogeneous titanium alloy T-joint with a plate thickness of 5mm, comprising the following steps:

[0030] (1) Before welding, process the part to be welded of the titanium alloy rib plate 4 into a K-shaped groove as required, with a blunt edge of 2mm and a groove angle of 30°, and grind or clean the surfaces on both sides of the processed workpiece, Fixed on the welding fixture;

[0031](2) Coaxial powder-feeding laser cladding is adopted, and the laser is applied to the area to be welded on both sides of the T-shaped joint. The periodically swinging MIG welding torch is placed behind the laser beam in a side-axis connection. Adjust the MIG welding torch, The angle between the laser beam and the rib plate 4 is guaranteed to be in the same plane, the angle between the MIG welding torch and the laser beam is 25°, the angle between the laser beam and the rib plate 4 is 40°, and the distance between the powder feeding nozzle and the laser beam The...

Embodiment 2

[0036] A method for welding a heterogeneous titanium alloy T-joint with a plate thickness of 7 mm, comprising the following steps:

[0037] (1) Before welding, process the part to be welded of the titanium alloy rib plate 4 into a K-shaped groove as required, with a blunt edge of 2mm and a groove angle of 30°, and grind or clean the surfaces on both sides of the processed workpiece, Fixed on the welding fixture;

[0038] (2) Coaxial powder-feeding laser cladding is adopted, and the laser is applied to the area to be welded on both sides of the T-shaped joint. The periodically swinging MIG welding torch is placed behind the laser beam in a side-axis connection. Adjust the MIG welding torch, The angle between the laser beam and the rib plate 4 is guaranteed to be in the same plane, the angle between the MIG welding torch and the laser beam is 25°, the angle between the laser beam and the rib plate 4 is 40°, and the distance between the powder feeding nozzle and the laser beam T...

Embodiment 3

[0043] A method for welding a heterogeneous titanium alloy T-joint with a plate thickness of 12mm, comprising the following steps:

[0044] (1) Before welding, process the part to be welded of the titanium alloy rib plate 4 into a K-shaped bevel as required, with a blunt edge of 4mm and a bevel angle of 40°, and grind or clean the surfaces on both sides of the processed workpiece, Fixed on the welding fixture;

[0045] (2) Coaxial powder-feeding laser cladding is adopted, and the laser is applied to the area to be welded on both sides of the T-shaped joint. The periodically swinging MIG welding torch is placed behind the laser beam in a side-axis connection. Adjust the MIG welding torch, The angle between the laser beam and the rib plate 4 is guaranteed to be in the same plane, the angle between the MIG welding torch and the laser beam is 45°, the angle between the laser beam and the rib plate 4 is 75°, and the distance between the powder feeding nozzle and the laser beam The...

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Abstract

The invention discloses a welding method of a heterogeneous titanium alloy T-shaped joint, which comprises the following steps of: 1, processing a to-be-welded part of a rib plate into a K-shaped groove, and fixing the K-shaped groove on a welding tool clamp; 2, adopting coaxial powder feeding type laser cladding, wherein lasers act on the to-be-welded area on the two sides of the T-shaped connector correspondingly, an MIG welding gun swinging periodically is arranged on the rear side of a laser beam, and the included angle between the MIG welding gun and the rib plate and the included angle between the laser beam and the rib plate are adjusted to be located on the same plane; 3, setting welding process parameters; and 4, introducing shielding gas in advance, conducting double-face laser cladding composite electric arc welding of the T-shaped connector, conducting synchronous different-direction welding on welding heat sources on the two sides, wherein electric arcs swing periodically, single-pass welding forming of the workpiece is achieved, and the shielding gas is continuously introduced for cooling after welding. The laser cladding powder is used for regulating and controlling configuration, the internal consistency of the welding seam is enhanced, the welding seam strength is improved, and cracks are restrained through components of the welding wire before solidification of a molten pool.

Description

technical field [0001] The invention relates to a welding method, in particular to a welding method for T-shaped joints of heterogeneous titanium alloys. Background technique [0002] Due to its high specific strength, titanium alloys have been widely used in the aerospace field. When manufacturing titanium alloy parts for aerospace, according to the service environment, temperature and required mechanical properties of different parts of the same part, heterogeneous titanium Alloys are increasingly being welded together, which reduces tooling costs without compromising the overall performance of the component. Due to the different components and contents of dissimilar titanium alloys, the corresponding physical performance parameters are different, and defects such as cold cracks are prone to occur during welding, making welding difficult. Using conventional welding methods such as argon arc welding, laser welding, and electron beam welding, the amount of welding deformati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/173B23K9/235C23C24/10C22C14/00B23K103/14
CPCB23K9/173B23K9/235C23C24/106C22C14/00B23K2103/14Y02P10/25
Inventor 赵勇蔡佰豪付娟陈夫刚崔卫杰饶志朋谷家扬
Owner JIANGSU UNIV OF SCI & TECH
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