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Molybdenum copper and stainless steel argon tungsten argon arc welding process

A technology of argon tungsten arc welding and molybdenum-copper alloy, applied in the field of molybdenum-copper alloy welding and tungsten argon arc welding, it can solve the problems of low joint strength, unsuitable connection and other problems, achieve convenient operation, improve welding process performance, Good corrosion resistance

Inactive Publication Date: 2008-10-15
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength of joints obtained by connecting molybdenum-copper alloys by spark plasma sintering and molybdenum-manganese activation brazing methods is low, and it is not suitable for the connection of structural parts that require high mechanical properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: Alloy composition is the argon tungsten arc welding of molybdenum-copper alloy plate of Mo60%-Cu40% (mass fraction) and 18-8 austenitic stainless steel plate butt joint, molybdenum-copper alloy plate size is 10cm * 10cm, and thickness is 2.5mm; 18-8 stainless steel plate size is 10cm×8cm, thickness is 2.5mm.

[0023] Firstly, the butt joint between molybdenum-copper alloy and 18-8 austenitic stainless steel is polished with sandpaper, so that the surface to be welded is exposed to metallic luster, and the surface roughness reaches Ra1.6-3.2. Cr25-Ni13 alloy wire with a diameter of 2.0 mm is used as the filler metal. Before welding, polish the surface of the welding wire with sandpaper. Tungsten argon arc welding (TIG) is used for welding, and the process parameters are: welding voltage 12V, welding current 105-110A, welding speed 60mm / min, argon gas flow rate 8-10L / min.

[0024] The protective gas is argon with a purity greater than 99.9%. After the arg...

Embodiment 2

[0028] Embodiment 2: the alloy composition is the argon tungsten arc welding of the molybdenum-copper alloy plate of Mo60%-Cu40% (mass fraction) and the fillet weld of 18-8 austenitic stainless steel plate, the size of the molybdenum-copper alloy plate is 10cm×10cm, The thickness is 2.5mm; the size of the 18-8 stainless steel plate is 10cm×8cm, and the thickness is 2.5mm.

[0029] First, the surface to be welded of the molybdenum-copper alloy and 18-8 stainless steel corner joint is polished with sandpaper to expose the metallic luster, so that the roughness of the surface to be welded reaches Ra1.6-3.2. The molybdenum-copper alloy and 18-8 stainless steel are assembled and welded at the corner joint. The assembly angle of the two plates is 90°right angle, and the welding is performed in an inverted boat-shaped position. Cr25-Ni13 alloy welding wire with a diameter of 2.5mm is used as the filling material, and the welding wire is polished with sandpaper before welding to revea...

Embodiment 3

[0035] Tungsten argon arc welding process between molybdenum copper alloy and stainless steel dissimilar materials, the steps are as follows:

[0036] (1) Before welding, the surface of the molybdenum-copper alloy and stainless steel to be welded is sandblasted, and then polished with sandpaper, so that the roughness of the surface to be welded reaches Ra 1.6 to 3.2;

[0037] (2) Use a Cr-Ni alloy welding wire with a diameter of 2.0mm as the filler metal, and use an acid solution (5% HF aqueous solution and 35% HNO 3 The mixture of aqueous solution) is pickled, and after the surface of the welding wire reveals a metallic luster, it is rinsed with water to neutrality, dried, and set aside;

[0038] (3) the surface-treated molybdenum-copper alloy described in step (1) is horizontally docked with the stainless steel joint to be welded;

[0039] (4) After the welding arc is started, the arc is stretched to 4mm, and the argon gas with a purity greater than 99.9% is used for protec...

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Abstract

The invention discloses an argon tungsten arc process of molybdenum copper and a dissimilar stainless steel material. The method comprises the steps of cleaning the surface of the molybdenum copper and the surface of the stainless steel, which are to be connected, and the surface the Cr-Ni alloy system welding wire used for filling before welding; preheating by using a tungsten electrode argon arc inclining to the molybdenum copper first after arc starting; adopting pure argon protection; keeping down the argon arc to control heat distribution and to conduct filler rod argon tungsten-arc welding. The method has the advantages of convenient operation and strong applicability. Furthermore, the obtained welding joint of the molybdenum copper and the stainless steel has higher strength and stable property, and can be widely used for welding the molybdenum copper and the stainless steel and other dissimilar materials, thus being worth popularization and application.

Description

technical field [0001] The invention relates to a welding method of a molybdenum-copper alloy, in particular to a tungsten argon arc welding method between a molybdenum-copper alloy and stainless steel dissimilar materials, and belongs to the field of welding technology. Background technique [0002] Molybdenum-copper alloy is an alloy formed by pressing molybdenum with high melting point and low linear expansion coefficient and copper with high electrical conductivity and low thermal conductivity by powder metallurgy. The mutual insolubility between molybdenum and copper makes them present a combination of the intrinsic physical properties of the two elements after compounding, which has the respective characteristics of molybdenum and copper, and has good comprehensive performance. These characteristics make molybdenum-copper alloys have broad application prospects when used as electrical contact materials, heat dissipation materials, and electronic packaging materials for...

Claims

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Application Information

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IPC IPC(8): B23K9/16B23K9/235B23K9/095B23K103/18
Inventor 李亚江王娟蒋庆磊
Owner SHANDONG UNIV
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