Titanium alloy and steel dissimilar metal tungsten electrode argon arc fusion welding process based on copper-nickel composite middle layer

A technology for compounding intermediate layers and dissimilar metals, applied in metal processing equipment, arc welding equipment, manufacturing tools, etc., can solve the problem of reducing the mechanical strength and service reliability of titanium/steel joints, differences in thermophysical properties, and low metallurgical solid solubility and other problems, to achieve the effect of no defects in weld formation, wide welding process window and simple process

Inactive Publication Date: 2020-11-17
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, the metallurgical solid solubility between iron and titanium is extremely low at room temperature, and it is easy to form intermetallic compounds TiFe and TiFe with high brittleness and high hardness. 2 , leading to cracking of titanium / steel joints after welding, and the mechanical strength is almost 0; the difference in thermophysical properties between titanium alloy and steel is significant, and the difference in melting point is less than 200 ° C, while the thermal conductivity and linear expansion coefficient of titanium alloy are only 1 of steel / 3~1 / 2, the stress of the joint after welding is large, and the weld is easy to crack
However, the linear expansion coefficient of copper is 1.5 times that of steel and 2.5 times that of titanium alloys. The internal tensile stress of the weld is large and easy to crack, which reduces the mechanical strength and service reliability of titanium / steel joints.

Method used

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  • Titanium alloy and steel dissimilar metal tungsten electrode argon arc fusion welding process based on copper-nickel composite middle layer
  • Titanium alloy and steel dissimilar metal tungsten electrode argon arc fusion welding process based on copper-nickel composite middle layer
  • Titanium alloy and steel dissimilar metal tungsten electrode argon arc fusion welding process based on copper-nickel composite middle layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033]Step 1: Take TC4 titanium alloy and 304 stainless steel plates with a thickness of 1mm, length and width of 200mm and 80mm respectively, use a wire angle grinder to remove the oxide film on the surface of the base metal to be welded, and use 400# sandpaper to polish the edge of the titanium alloy to be welded and the butt end surface , use alcohol to wipe the base metal to be welded and dry it for later use.

[0034] Step 2: Use cold spray technology to spray high-purity copper powder (99.99% purity) on the part of the titanium alloy to be welded. The particle size of the copper powder is 20 μm. The cold spraying process parameters are: acceleration air pressure 2.5MPa, powder feeding air pressure 3MPa, powder feeding volume 25g / min, helium heating temperature 400-450°C, spraying distance 15mm. According to the test, the thickness of the copper coating under this process is about 0.5mm.

[0035] Step 3: Assembly positioning. Put the cold sprayed titanium alloy and stai...

Embodiment 2

[0040] Step 1: Clean up the base metal to be welded in the same manner as in Example 1.

[0041] Step 2: Use cold spray technology to spray high-purity copper powder (99.99% purity) on the part of the titanium alloy to be welded. The particle size of the copper powder is 20 μm. The cold spraying process parameters are: acceleration gas pressure 2.5MPa, powder feeding gas pressure 3MPa, powder feeding volume 15g / mi, helium heating temperature 400-450°C, spraying distance 15mm. According to the test, the thickness of the copper coating under this process is about 0.1 mm.

[0042] Step 3: The assembly and positioning method is the same as that in Embodiment 1.

[0043] Step 4: Welding. The welding power source adopts variable polarity tungsten argon arc welding (VPTIG), the welding current is 30A, the welding speed is 120mm / min, the wire feeding speed is 360mm / min, and the shielding gas flow rate is 15L / min.

[0044] Step 5: After the welding is completed, delay the air supply...

Embodiment 3

[0047] Step 1: Clean up the base metal to be welded in the same manner as in Example 1.

[0048] Step 2: Use cold spray technology to spray high-purity copper powder (99.99% purity) on the part of the titanium alloy to be welded. The particle size of the copper powder is 20 μm. The cold spraying process parameters are: acceleration gas pressure 3.5MPa, powder feeding gas pressure 4MPa, powder feeding volume 35g / min, helium heating temperature 400-450°C, spraying distance 15mm. According to the test, the thickness of the copper coating under this process is about 0.3mm.

[0049] Step 3: The assembly and positioning method is the same as that in Embodiment 1.

[0050] Step 4: Welding. The welding power source adopts variable polarity tungsten argon arc welding (VPTIG), the welding current is 50A, the welding speed is 120mm / min, the wire feeding speed is 480mm / min, and the shielding gas flow rate is 15L / min.

[0051] Step 5: After the welding is completed, delay the air supply...

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Abstract

The invention provides a titanium alloy and steel dissimilar metal tungsten electrode argon arc fusion welding process based on a copper-nickel composite middle layer, and belongs to the field of dissimilar metal composite structure manufacturing. The welding process can effectively solve the problems that a titanium/steel dissimilar metal fusion welding joint is low in strength, prone to cracking, narrow in process window and the like due to brittle phase generation and thermal expansion coefficient mismatch. A titanium alloy, a copper coating, a nickel-based welding wire and stainless steelare sequentially arranged on a middle layer of a joint. By adopting the copper-nickel composite middle layer, the generation of brittle intermetallic compounds in the titanium/steel fusion welding joint can be effectively regulated and controlled, the welding stress of the titanium/steel fusion welding joint is reduced, and the generation of welding cracks is reduced. By the adoption of the welding process, the high-quality titanium/steel dissimilar metal fusion welding joint which is high in strength, attractive in appearance and free of cracks and has certain ductility and toughness can be obtained.

Description

technical field [0001] The invention relates to a titanium alloy and steel dissimilar metal tungsten argon arc (TIG) welding process, belonging to the field of dissimilar metal composite structure manufacturing. Background technique [0002] The rapid development of advanced equipment manufacturing industry has put forward higher requirements for the comprehensive performance of structural materials. Features such as light weight, high strength, easy processing, corrosion resistance, environmental protection, and low cost have gradually become important indicators for material selection. Titanium alloy has the characteristics of high specific strength, good corrosion resistance and easy processing, and is widely used in aerospace, chemical industry, nuclear industry and medical equipment and other fields; however, its high price restricts the large-scale and civilian application of titanium alloy . The use of titanium alloy / steel composite structure can combine the performa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/235B23K103/24
CPCB23K9/167B23K9/235B23K2103/24
Inventor 董红刚郝晓虎李鹏
Owner DALIAN UNIV OF TECH
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