High temperature resistance and oxidation resistance low expansion alloy gas shielded welding wire

A low-expansion alloy and gas shielded welding technology, which is applied in welding medium, welding equipment, metal processing equipment, etc., can solve the problems of incomplete fusion and incomplete penetration, achieve good weldability, reduce thermal stress, and prevent welding thermal cracks Effect

Active Publication Date: 2015-12-02
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the viscosity of the molten pool of this type of alloy, it is prone to incomplete fusion and incomplete penetration defects during welding

Method used

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  • High temperature resistance and oxidation resistance low expansion alloy gas shielded welding wire
  • High temperature resistance and oxidation resistance low expansion alloy gas shielded welding wire

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0017] The preparation method of welding wire is:

[0018] (1) Vacuum induction furnace is used to smelt welding wire alloy. The process conditions are: vacuum degree 0.1~1.0Pa, refining temperature 1560~1580℃, refining time 20~25 minutes, stop heating, freeze until the melt is dark red, add Al, V , and then refined for 5 minutes, and finally poured at a pouring temperature of 1420-1430°C;

[0019] (2) The welding wire alloy is remelted in a vacuum consumable electric arc furnace, and its process conditions are: vacuum degree 0.1-1.0Pa, voltage 20-35V, current density 150-200A / cm 2 , Melting speed 5.0~10.0cm / min;

[0020] (3) Homogenize the remelted ingot after removing shrinkage cavities and car skin. The homogenization treatment specification is: 1060°C×1hr→1120°C×1.5hr→1180°C×2hr, air cooling;

[0021] (4) Forge the homogenized ingot into a round bar. The forging specification is: heating temperature 1170°C±10°C, heat preservation 20-60min, heat preservation time shortens...

Embodiment

[0030] Three welding wires were prepared respectively, and the components in Table 1 were used for the welding wire composition.

[0031] Table 1 Welding wire composition (wt.%)

[0032]

[0033] (1) Ratio of charge

[0034] According to the target content of each element and the smelting loss coefficient, determine the ratio of each raw material.

[0035] (2) Vacuum induction furnace is used to smelt welding wire alloy. The process conditions are: vacuum degree 0.1~1.0Pa, refining temperature 1560~1580℃, refining time 20~25 minutes, stop heating, freeze until the melt is dark red, add Al and Ti And rare earth Y, then refining for 5 minutes, and finally pouring, the pouring temperature is 1410-1420°C;

[0036] (3) Vacuum consumable electric arc furnace is used to remelt welding wire alloy, and its process conditions are: vacuum degree 0.1~1.0Pa, voltage 20~35V, current density 150~200A / cm 2 , Melting speed 5.0~10.0cm / min;

[0037] (4) Homogenize the remelted ingot after...

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PUM

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Abstract

The invention relates to a welding wire for gas shielded welding of a high-temperature-resistant antioxidant low-expansion alloy. The welding wire comprises the following chemical components in percentage by weight: 0.01 to 0.10 percent of C, 4.5 to 9.0 percent of Cr, 1.0 to 2.0 percent of Co, 24.5 to 27.0 percent of Mo, 1.0 to 6.0 percent of Fe, less than or equal to 0.60 percent of Si, less than or equal to 0.60 percent of Mn, less than or equal to 0.025 percent of P, less than or equal to 0.020 percent of S, 0.10 to 0.50 percent of Cu, less than or equal to 0.60 percent of V, less than or equal to 0.50 percent of Al, 0.002 to 0.006 percent of B and the balance of Ni. When the welding wire disclosed by the invention is used for welding the antioxidant high-temperature-resistant low-expansion alloy of a Ni-Mo-Cr system, the welding seam hot crack resistance is improved, the plasticity of a connector is improved, the equivalent tensile and lasting performance as those of a base material at room temperature or a high temperature are obtained after post-weld heat treatment. The welding wire is suitable for the gas shielded welding of the high-temperature-resistant antioxidant low-expansion alloy in aviation industry and other industrial fields.

Description

technical field [0001] The invention belongs to a welding wire used for gas-shielded welding of Ni-Mo-Cr series high-temperature-resistant, oxidation-resistant and low-expansion alloys. Background technique [0002] Aeroengines and ground gas turbines use low-expansion superalloy components to achieve active clearance control, reduce gas loss, reduce fuel consumption, and improve performance such as thrust-to-weight ratio. High-performance engines put forward higher requirements for low-expansion superalloys, not only to achieve gap control in structure, reduce gas loss and improve thermal efficiency, but also to have better temperature and oxidation resistance. The equipment also requires the engine material to have good corrosion resistance. At present, there are low-expansion superalloys GH907 and GH909 for 550-600°C and GH783 for 700°C and above. Since GH907 and GH909 do not contain chromium, and GH783 only contains 3% chromium, their oxidation resistance and corrosion...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/304B23K35/40
Inventor 郭绍庆孙兵兵熊华平唐思熠李能张学军杜博睿
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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