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Tungsten electrode argon arc welding process of dissimilar materials of titanium alloy and nickel alloy

A technology of argon tungsten arc welding and dissimilar materials, applied in the connection between titanium alloy components and nickel alloy components, in the field of argon tungsten arc welding, to reduce hot cracking tendency, improve melting and solidification conditions, and increase welding efficiency Effect

Inactive Publication Date: 2014-06-25
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to propose a welding method between titanium alloy and nickel alloy dissimilar metals with simple welding process control and stable welding quality, to overcome defects such as welding cracks and pores, and improve the crack resistance of the weld and the stability of the joint High efficiency, efficient production of qualified welded joints

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Filled tungsten argon arc welding of TA15 titanium alloy plate and GH4169 nickel alloy plate. The size of the TA15 titanium alloy plate is 200mm×150mm and the thickness is 3mm; the size of the GH4169 nickel alloy test plate is 200mm×150mm and the thickness is 3mm, and the two plates are butt welded.

[0034] The specific process steps of titanium alloy and nickel alloy filled wire tungsten argon arc welding are as follows:

[0035] (1) Process the V-shaped groove on the butt joint between the welded titanium alloy and the nickel alloy plate, with a groove angle of 75°, and then use a stainless steel wire brush to clean the grease, oxide film and dirt on the surface of both sides of the groove of the workpiece joint within 20mm , to reveal obvious metallic luster;

[0036] (2) Ni-Cu alloy welding wire with a diameter of 2.0mm is used as the filler material, and the chemical composition (mass fraction, %) of the welding wire used is: C0.08, Mn3.0, Fe1.0, Si1.25, Cu21. 5...

Embodiment 2

[0045] Filled wire tungsten argon arc welding of TA3 titanium alloy pipe and N8 nickel alloy pipe joint, the diameter of TA3 titanium alloy pipe and N8 nickel alloy pipe is Φ6mm, and the wall thickness is 2mm.

[0046] The specific process steps of tungsten argon arc welding of titanium alloy and nickel alloy pipe joints are as follows:

[0047] (1) Clean the grease, oxide film and dirt within 20mm on both sides of the TA3 titanium alloy pipe and N8 nickel alloy pipe joint to be welded with a stainless steel wire brush, so that the surface to be welded reveals a metallic luster; then the titanium alloy and The nickel alloy pipe joints are all chamfered with a fine grinding wheel to 1mm;

[0048] (2) Use Ni-Cu alloy welding wire with a diameter of 1.5mm as the filler material, and the chemical composition (mass fraction, %) of the welding wire used is: C0.15, Mn4.5, Fe2.5, Si0.9, Cu25, Ti10.5, S=0.015%, P=0.02%, the rest is Ni;

[0049] (3) Preheat the titanium alloy and nickel...

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Abstract

The invention discloses a tungsten electrode argon arc welding process of dissimilar materials of titanium alloy and nickel alloy. Ni-Cu alloy welding wires are selected to serve as filling materials, a cerium-tungsten electrode is adopted for argon arc welding, the end of the electrode is abraded to be a cone of 30-45 degrees, argon is adopted as the protective gas, the melting and solidification conditions of a welding molten pool of the titanium alloy and the nickel alloy are controlled through preparation before welding, preheating, welding, cooling after welding and adjustment on welding process parameters, and a welding connector which is attractive in appearance of a weld and does not have the defects of cracks or air holes can be obtained. According to the method, the welding efficiency is high, cost is low, operation is convenient and flexible, and the use requirement of the welding connector of the dissimilar materials of the titanium alloy and the nickel alloy can be met.

Description

technical field [0001] The invention belongs to the field of welding technology, and relates to a tungsten argon arc welding method suitable for dissimilar materials of titanium alloy and nickel alloy, which can be used for the connection between titanium alloy components and nickel alloy components. Background technique [0002] Titanium and its alloys have the advantages of light weight, high specific strength, and good corrosion resistance, so their applications in aerospace, petrochemical and other fields continue to expand. With the rise of titanium and titanium alloys as an important metal material, its welding technology has achieved great development. Titanium is very active, and when heated to 400-500 ° C, it absorbs oxygen, hydrogen, nitrogen and other gases and hardens; titanium easily forms brittle intermetallic compounds with most metals. Nickel is a non-carbide forming element, and the compound formed with titanium has certain plasticity, and nickel has good p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/167B23K9/23B23K9/235B23K35/30
CPCB23K9/022B23K9/167B23K9/232B23K9/235B23K35/3033B23K2103/18
Inventor 王娟李亚江
Owner SHANDONG UNIV
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