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Argon arc welding method suitable for TiAl-based alloy material and titanium alloy

A titanium alloy and base alloy technology, applied in arc welding equipment, welding equipment, metal processing equipment, etc., can solve the problems of easy cracks in TiAl, limited joint forms, and inapplicability, so as to avoid welding cracks and joint crack sensitivity Reduced, easy-to-operate effects

Active Publication Date: 2011-11-02
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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Problems solved by technology

The friction welding method can solve the welding problems of some special structures, but it has great restrictions on the joint form, which is not applicable in many practical applications
[0007] Harbin Institute of Technology has studied the electron beam welding of TiAl-based alloys and TC4 alloy dissimilar materials. The research results show that the electron beam welded joints of Ti-43Al-9V-0.3Y / TC4 dissimilar materials are well formed and have no undercut defects, but the TiAl joints after welding prone to cracks on one side

Method used

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  • Argon arc welding method suitable for TiAl-based alloy material and titanium alloy
  • Argon arc welding method suitable for TiAl-based alloy material and titanium alloy

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Embodiment

[0024] The filling material that each embodiment of table 1 uses

[0025]

[0026]

[0027] The welding of TiAl base alloy and titanium alloy, the steps of this method are:

[0028] (1) base material to be welded and filler material in the embodiment are listed in table 1 respectively, and welding wire is prepared, and clean welding wire surface;

[0029] (2) The size of the TiAl and titanium alloy welding test plate is 90×50×2.5 mm, and the TiAl-based material is subjected to pre-weld heat treatment, and the heat treatment system is shown in Table 1;

[0030](3) Process the welding groove, blunt edge 0.5mm, unilateral angle 35°, remove the oxide film within 10mm on both sides of the groove to make it bright, and scrub with acetone before welding;

[0031] (4) The welding between the TiAl-based alloy and the titanium alloy adopts the argon tungsten arc welding method, and the welding wire described in Table 1 is used for the welding between the TiAl-based alloy and the ...

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Abstract

The invention belongs to the technical field of welding, and relates to an argon arc welding method suitable for a TiAl-based alloy and a titanium alloy material. The method comprises the following steps of: (1) selecting a titanium alloy welding wire of TA0-1 or TC4 or the same brand as a welded titanium alloy base material as a welding filling material; (2) performing pre-welding thermal treatment on the TiAl-based alloy to be welded, wherein the thermal treatment temperature is 1,310 to 1,350 DEG C; (3) preheating a test piece to be welded or a part to be welded in an argon filled box by adopting an induction coil, and measuring the temperature of the welded TiAl-based alloy at the position within 20 millimeters far from a seam, wherein the preheating temperature is between 500 and 800 DEG C; (4) performing argon tungsten-arc welding in the argon filled box; and (5) performing annealing thermal treatment on the welded piece after welding, wherein the full stress removal annealing temperature of the welded titanium alloy is selected as the thermal treatment temperature. The room temperature tensile strength of an obtained joint is 400 to 490MPa, and achieves 80 to 95 percent of that of the TiAl base material.

Description

technical field [0001] The invention belongs to the field of welding technology and relates to an argon arc welding method suitable for TiAl-based alloys, titanium alloy materials and titanium alloys. Background technique [0002] TiAl intermetallic compounds have a light specific gravity (about 3.8g / cm 3 ), high specific strength, good rigidity, good high-temperature mechanical properties and oxidation resistance, etc., is considered to be an ideal new type of high-temperature structural material for aviation, aerospace, military and civilian use with research and development application prospects. It is used to replace some titanium alloy materials to meet the needs of high temperature work. However, TiAl-based alloys have low room temperature plasticity, and the room temperature elongation is only 1% to 2%, so they cannot be used in structures or parts that require plasticity. According to the characteristics of the materials and the different conditions of use, it is m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K9/23B23K9/235
Inventor 熊华平刘文慧郭绍庆张学军周标李能
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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