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Welding method for Ti2AlNb-based intermetallic compound and dissimilar titanium alloy

A compound and titanium alloy technology, applied in welding equipment, laser welding equipment, metal processing equipment, etc., can solve problems affecting the mechanical properties of the weld, affecting the performance of the weld, and asymmetry of the weld, so as to improve the welding heat cycle, The effect of reducing welding heat input and reducing high temperature brittleness

Inactive Publication Date: 2015-05-20
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Most aerospace components are complex components, and most of them need to be connected between the same or different materials. When it comes to Ti 2 When AlNb-based intermetallic compounds are laser-welded with other dissimilar titanium alloys, due to the inconsistency of the thermophysical parameters such as the melting point, thermal conductivity, and thermal expansion coefficient of the two base materials, the weld seam is asymmetrical and funnel-shaped, and defects such as pores are prone to occur. , which seriously affects the performance of the weld, such as figure 1 shown
Even if the laser beam is biased to a certain distance from the base metal on one side in order to solve the weld asymmetry caused by the different physical properties of different base materials, it is easy to produce defects such as misalignment, which seriously affects the mechanical properties of the weld, such as figure 2 shown
[0003] These disadvantages limit the Ti 2 Popularization and Application of Laser Welding of AlNb-based Alloys and Dissimilar Titanium Alloys in Aerospace

Method used

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  • Welding method for Ti2AlNb-based intermetallic compound and dissimilar titanium alloy
  • Welding method for Ti2AlNb-based intermetallic compound and dissimilar titanium alloy
  • Welding method for Ti2AlNb-based intermetallic compound and dissimilar titanium alloy

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specific Embodiment approach 1

[0020] Specific embodiment one: a kind of Ti of this embodiment 2 The method for AlNb-based intermetallic compound and dissimilar titanium alloy welding, it is to carry out according to the following steps:

[0021] Step 1: Before welding, grind or clean the surface of the workpiece to be welded, and fix the polished or cleaned workpiece to be welded on the welding fixture; wherein, the workpiece to be welded is Ti 2 AlNb-based intermetallic compounds and dissimilar titanium alloys;

[0022] Step 2: Apply laser and TIG welding together on the area to be welded, and set the geometric parameters: the defocus amount is -3~﹢3mm;

[0023] Step 3: Set the welding parameters of laser-TIG hybrid welding: the arc current is 50-500A, the angle between the welding torch and the vertical direction is 10°-45°, the welding speed is 50-500mm / min, and the shielding gas is an inert gas; The power is 500~10,000W;

[0024] Step 4: Start the control switch, first pass in the shielding gas, and...

specific Embodiment approach 2

[0030] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the welding method adopts the parallel placement mode of laser and TIG electric arc perpendicular to the weld seam direction for welding, and the welding conditions are: the welding torch and the laser head are in the The same plane, and the plane is perpendicular to the direction of the weld, the laser head is located on the side of the workpiece with a relatively high melting point among the workpieces to be welded, and the focus of the laser beam is focused on the edge of the side of the workpiece with a relatively high melting point among the butt welded workpieces to be welded, The angle between the laser beam and the vertical direction is 5-30°; the welding torch of the TIG arc is located on the side of the workpiece with a relatively low melting point among the workpieces to be welded, and the welding torch is placed at the center of the weld gap. Others are the same as...

specific Embodiment approach 3

[0032] Embodiment 3: This embodiment is different from Embodiment 1 in that: the dissimilar titanium alloy is α titanium alloy or β titanium alloy or other dissimilar titanium alloys. Others are the same as in the first embodiment.

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Abstract

The invention discloses a welding method for Ti2AlNb-based intermetallic compound and dissimilar titanium alloy, and relates to a composite welding method for a bias laser and TIG electric arc in a parallel arranging mode. The method comprises the steps that: firstly, cleaning and polishing are carried out on a to-be-welded workpiece, and a fixture is fixed; secondly, a geometrical parameter is set; thirdly, a welding parameter of laser-TIG composite welding is set; fourthly, the electric arc is activated, and welding is carried out. The laser acts on one side of high-melting point base metal, and the TIG electric arc acts on one side of low-melting point base metal. Compared with laser welding, the weld heat input is lowered, the retention time on a high-temperature peak value is shortened, the welding joint of the high-temperature intermetallic compound is reduced, and therefore the high-temperature brittleness is lowered. By adding the TIG electric arc, the weld heat cycle is improved, the inter-coupling effect of two heat sources, namely the laser and the TIG electric arc, is demonstrated, the two heat sources, namely the laser and the TIG electric arc, are arranged perpendicular to the direction of the welding, the locating accuracy of the welding joint during the laser welding is greatly lowered, and the adaptability of the welding process is improved.

Description

technical field [0001] The invention belongs to the field of material processing engineering, in particular to a Ti 2 Laser welding method of AlNb-based intermetallic compounds and dissimilar titanium alloys—a composite welding method of parallel arrangement of bias laser and TIG arc. Background technique [0002] Ti 2 As the second-generation O-phase alloy, AlNb-based alloy has good room temperature plasticity, fracture toughness and high-temperature oxidation resistance. It can be used for a long time at 600-800°C and short-term use above 1000°C. It is the most promising alternative to nickel-based alloys. One of the lightweight and high temperature resistant aero-engine materials. Most aerospace components are complex components, and most of them need to be connected between the same or different materials. When it comes to Ti 2 When AlNb-based intermetallic compounds are laser-welded with other dissimilar titanium alloys, due to the inconsistency of the thermophysical...

Claims

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Application Information

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IPC IPC(8): B23K26/348B23K26/323
CPCB23K9/167B23K26/20
Inventor 雷正龙王祥龙刘鸣李福泉陈彦宾张可召
Owner HARBIN INST OF TECH
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