A Diffusion Welding Method for Improving the Strength of gh4099 Welded Joints

A technology of GH4099 and welded joints, which is applied in the field of diffusion welding, can solve the problems that the performance of welded joints cannot meet the needs of engineering applications and the deterioration of base metals, etc., and achieve the effects of small axial deformation rate, high welding rate, and mutual diffusion

Active Publication Date: 2018-02-16
江苏博联硕焊接技术有限公司
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0005] Therefore, on the basis of existing research, the performance of welded joints of GH4099 cannot meet the needs of practical engineering applications, and the performance of the joints is significantly worse than that of the base metal.

Method used

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  • A Diffusion Welding Method for Improving the Strength of gh4099 Welded Joints
  • A Diffusion Welding Method for Improving the Strength of gh4099 Welded Joints

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Vacuum diffusion welding of GH4099 welded joints, the steps are as follows:

[0026] Such as figure 1 The workpiece to be welded is a rod-shaped GH4099 of φ38mm×35.5mm.

[0027] Select 4μm thick nickel-chromium alloy foil (Cr 25wt.% and Ni 75wt.%) as the intermediate layer, use sandpaper to polish the surface of nickel-chromium alloy foil 2 and GH4099 workpiece to be welded, so that the surface roughness is less than 1μm, after alcohol solution After ultrasonic cleaning for 5 minutes, dry with cold air for later use.

[0028] The above-mentioned materials are clamped, and the nickel-chromium alloy foil 2 is placed between the GH4099 welding joint 4 substrates, and the components to be welded are placed between the upper pressure head 3 and the lower pressure head 5 of the diffusion welding furnace, Solder resist layer 1 is respectively set between the upper indenter 3, the lower indenter 4 and the workpiece to be welded, and a pre-pressure of 0.5MPa is applied to clos...

Embodiment 2

[0037] Different from Example 1, the thickness of the middle layer of the nickel-chromium alloy foil is reduced from 4 μm to 1 μm, and the welding pressure is reduced from 30Mpa to 27Mpa. The test results of the joint after butt welding show that the tensile sample is broken from the base material, and the joint is at room temperature The tensile strength is 1046MPa.

Embodiment 3

[0039] Different from Example 1, during the welding process, the ultrasonic vibration amplitude changed from 20 μm to 10 μm. The test results of the joint after butt welding showed that the tensile sample was broken from the base metal, and the tensile strength of the joint at room temperature was 1052 MPa.

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Abstract

The invention provides a diffusion welding method for improving the strength of GH4099 welding joints. The diffusion welding method comprises the steps that a nichrome foil and the to-be-welded surfaces of the GH4099 welding joints are firstly polished and cleaned and are blow-dried with cold air for standby application, the treated nichrome foil is put between the two GH4099 welding joints, and a welded workpiece is formed; then the welded workpiece is put between an upper press head and a lower press head of a diffusion welding furnace, solder mask layers are arranged between the upper press head and the welded workpiece and between the lower press head and the welded workpiece, then pre-pressure is applied, and a furnace door is closed; and finally, the diffusion welding furnace is vacuumized, supersonic vibration is adopted, axial welding pressure is applied, heat preservation is carried out, then the pressure and vibration are unloaded, furnace cooling is carried out, and welding is completed. According to the diffusion welding method, the time needed for diffusion connection can be greatly shortened, the production efficiency can be improved, and the influence of the too long time on performance degradation of a base material can be reduced; and mutual diffusion between the base material and an interlayer element is facilitated, and the structural constituents of the base material and the interlayer element are similar after welding.

Description

technical field [0001] The invention relates to a diffusion welding method for improving the strength of GH4099 welded joints. Background technique [0002] GH4099 alloy is a Ni-Cr-based precipitation-strengthened superalloy. The addition of alloying elements makes the material have high thermal strength, and the maximum service temperature can reach 1000°C. It is widely used in the manufacture of high-temperature structural parts such as aero-engine combustors and afterburners. Due to the limitations of the diffusion of heterogeneous elements, realizing the high-strength diffusion connection of GH4099 has become a key indicator to measure the quality of structural parts. [0003] The document "Effect of Joining Temperature on TLP Joint Interface Structure and Properties of GH4169 Alloy" discloses a method for instantaneous liquid phase diffusion welding of GH4169 superalloy. The 50μm thick Ni82CrSiB amorphous foil is used as the middle layer, the welding temperature range...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/14B23K20/10B23K20/24
CPCB23K20/106B23K20/14B23K20/24B23K2103/18B23K2103/26
Inventor 孙福张昊王莉敏邵长斌王蒙蒙
Owner 江苏博联硕焊接技术有限公司
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