Method for performing diffusion welding of aluminum base alloy and titanium alloy after laser melting
A laser fusion and diffusion welding technology, applied in welding equipment, welding/welding/cutting items, non-electric welding equipment, etc. The effect of grain refinement and reduction of plastic deformation
Inactive Publication Date: 2014-05-07
NORTH CHINA ELECTRIC POWER UNIV (BAODING) +2
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Problems solved by technology
Different from the solid-state connection of the same alloy, due to the performance difference between dissimilar alloys, especially the difference in high temperature performance, it increases the difficulty in the selection of connection process parameters and process implementation
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Embodiment 1
[0032] The method for carrying out diffusion welding of titanium-aluminum base alloy and titanium alloy (TC4) after laser melting, the steps are as follows:
[0033] (1) Clean the surface of titanium-aluminum-based alloy and titanium alloy (TC4): first use 200#, 400#, 600#, 800#, 1000# metallographic sandpaper to polish step by step, and then put the base metal into acetone solution Clean with ultrasound.
[0034] (2) Coating the surface of titanium-aluminum-based alloy and titanium alloy (TC4).
[0035] (3) Place the test piece to be welded in a heat treatment furnace and preheat it to 300°C.
[0036] (4) The titanium-aluminum-based alloy to be welded is subjected to laser melting treatment, and the process parameters are: power 1.2KW, scanning speed 2mm / s.
[0037] (5) The titanium alloy to be welded (TC4) is subjected to laser melting treatment, the process parameters are power 1.2KW, and scanning speed 3mm / s.
[0038] (6) Put the specimen to be welded after laser meltin...
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Abstract
The invention discloses a method for performing diffusion welding of aluminum base alloy and titanium alloy after laser melting, which belongs to the field of welding technology. The method comprises the following steps: clearing the surface of welding parent metal; performing laser melting on cleared aluminum base alloy and titanium alloy to be welded; putting the aluminum base alloy and the titanium alloy to be welded in a protective sleeve after the laser melting; and performing the diffusion welding for the aluminum base alloy and the titanium alloy at a temperature range of 900-930 DEG C and a pressure range of 60-90MPa. According to the invention, the tensile strength of an obtained joint is at a range of 320-380MPa under normal temperature, up to 70-87% of the tensile strength of titanium alloy parent metal; and under the temperature of 400 degree, the tensile strength is at the range of 330-400MPa, up to 70-83% of the tensile strength of titanium alloy parent metal.
Description
technical field [0001] The invention belongs to the field of welding technology, and relates to a method for diffusion welding of a titanium-aluminum base alloy and a titanium alloy (TC4) after laser melting. Background technique [0002] With the rapid development of the aerospace industry, the requirements for structural materials, especially for high temperature strength and thermal stability, are getting higher and higher. In order to develop high-efficiency aero-engines, improve the engine thrust-to-weight ratio and the service temperature of key engine components, it is obviously of great significance to vigorously develop structural materials with excellent specific strength, specific stiffness, and high-temperature performance, as well as corresponding manufacturing technologies. Titanium aluminum alloy is known for its low density (3.8g / cm 3 ), high strength, good heat resistance and oxidation resistance, and the limit service temperature can reach above 980 °C, wh...
Claims
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IPC IPC(8): B23K20/233B23K20/24C21D1/09B23K103/18
Inventor 薛志勇黄源珣王永田张小燕陈雨峰徐刚
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)