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Method for welding titanium or titanium alloy with 2219 aluminum alloy

A welding method and aluminum alloy technology, applied in welding equipment, welding/welding/cutting articles, metal processing equipment, etc., can solve the problems that welded joints do not have practical value, reliable welding cannot be performed, and direct brazing is not feasible, etc. Achieve the effect of reducing the possibility of joint corrosion, avoiding welding defects, and reliable welding

Active Publication Date: 2015-11-11
AEROSPACE RES INST OF MATERIAL & PROCESSING TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The existing welding methods between titanium and titanium alloy and 2219 aluminum alloy, such as argon tungsten arc welding, electron beam welding and brazing, etc., cannot be reliably welded because titanium and aluminum have metallurgical incompatibility. If tungsten For welding methods such as argon arc welding or electron beam fusion welding, the welded joint will produce titanium-aluminum intermetallic compound, which is a brittle phase, so that the welded joint has no practical value at all; Aluminum alloy, which contains about 6% copper and some other alloying elements such as Ti, Zr, V, Mn, etc. The existence of these elements leads to a lower melting temperature of 2219 aluminum alloy, about 540 ° C, which is lower than that of the existing aluminum base Solder solidus temperature (BAl88Si, 580°C), so direct brazing is not feasible

Method used

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  • Method for welding titanium or titanium alloy with 2219 aluminum alloy
  • Method for welding titanium or titanium alloy with 2219 aluminum alloy

Examples

Experimental program
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Embodiment 1

[0052] Step one, press figure 1 Process the parts, clean and dry the parts to be welded;

[0053] The second step is to assemble the 3A21 aluminum alloy pipe fittings and TC4 titanium alloy pipe fittings as required;

[0054] The third step is to select aluminum-based solder AlSiCuMg, the main components are Si: 10.0-13%, Cu: 4.0-6.0%, Mg: 1.2-2.0 and the balance is Al, and the solder is made into a suitable shape and put into the solder tank middle;

[0055] The fourth step is to put the workpiece to be welded with assembled solder into the vacuum brazing furnace. 8 to 20 minutes, then turn off the heating power and cool down with the furnace, the temperature of the furnace is cooled to below 100°C, and the vacuum pressure during the heating process is not greater than 5×10 -2 Pa;

[0056] The fifth step is to carry out air tightness and ultrasonic testing and tensile tests on the brazed joints; the brazing seam is continuous and dense, and there is no leakage at 3MPa for...

Embodiment 2

[0061] Step one, press figure 1 Process the parts, clean and dry the parts to be welded;

[0062] The second step is to assemble the 3A21 aluminum alloy pipe fittings and TC4 titanium alloy pipe fittings as required;

[0063] The third step is to select aluminum-based solder BAl88Si, the main components are Si: 10.0-13%, Cu: 4.0-6.0%, Mg: 1.2-2.0 and the balance is Al, and the solder is made into a suitable shape and put into the solder tank middle;

[0064] The fourth step is to put the workpiece to be welded with assembled solder into the vacuum brazing furnace. 8 to 20 minutes, then turn off the heating power and cool down with the furnace, the temperature of the furnace is cooled to below 100°C, and the vacuum pressure during the heating process is not greater than 5×10 -2 Pa;

[0065] The fifth step is to conduct air tightness, ultrasonic and tensile testing on the brazed joint;

[0066] The sixth step is to assemble the brazing parts and 2219 aluminum alloy pipe fit...

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Abstract

The invention relates to a method for welding titanium or titanium alloy with 2219 aluminum alloy and belongs to the field of metal connection. In order to achieve the purpose of the invention, first, a proper transition material needs to be found. The material needs to have great weldability (fusion welding, or high-energy beam welding or brazing) with titanium, titanium alloy and 2219 aluminum alloy, and the material self needs to have high strength and tenacity. Comprehensive performance comparison shows that the material has great brazing weldability with 3A21 aluminum alloy, the titanium and the titanium alloy and has great electron beam welding weldability with 2219 aluminum alloy, and a reliable welding joint can be formed in any case. The connecting technology is successfully used into an XX-1 or XX-2 level PMD management device structure and has a great application effect.

Description

technical field [0001] The invention belongs to the field of metal connection and relates to a welding method for titanium or titanium alloy and 2219 aluminum alloy. Background technique [0002] Welding of dissimilar metal materials is an important problem in the field of welding technology. Due to the significant differences in physical and chemical properties of dissimilar metals, the welding process is much more complicated than that of the same metal, and the quality of welded joints is difficult to guarantee. Ti and Al are two widely used engineering materials. They have different excellent properties. In order to realize the lightweight of structural parts in industries such as aviation, aerospace and automobiles, a large number of aluminum alloys and titanium alloys are used as structural materials. Titanium The connection of alloys and aluminum alloys to form composite structures has broad application prospects. [0003] With the launch demand of a large number of ...

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K1/19B23K1/005
CPCB23K1/0056B23K1/008B23K1/19B23K2103/18
Inventor 宁立芹李海刚周炼刚康黎胡太文
Owner AEROSPACE RES INST OF MATERIAL & PROCESSING TECH
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