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High temperature brazing process of super nickel laminated material and Cr18-Ni8 stainless steel

A technology of cr18-ni8 and laminated materials, which is applied in the field of material welding, can solve problems such as welding difficulties, over-burning of super nickel clad layers, welding deformation, etc., and achieve good fluidity and seam filling ability, beautiful brazing seam shape, high temperature The effect of small intervals

Inactive Publication Date: 2011-01-12
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Due to the different thermophysical properties of the super nickel clad layer and the Ni-Cr base layer, welding cracks are likely to occur when this material is welded by fusion welding, especially when it is welded with stainless steel, the chemical composition and thermal expansion coefficient of the two are very different. make welding more difficult
Chinese invention patent ZL 200810016502.8, publication number: CN101284329, discloses a wire-filled tungsten argon arc welding method, through strict control of welding parameters, the fusion welding of super nickel laminate materials and Cr18-Ni8 stainless steel is realized, but for thinner The super nickel laminated material plate is easy to produce welding deformation by the wire tungsten argon arc welding method, and the quality of the joint is greatly affected by the welding parameters. If the parameters or improper operation are easy to cause overburning of the super nickel cladding, Ni- Defects such as lack of fusion in the Cr base layer

Method used

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  • High temperature brazing process of super nickel laminated material and Cr18-Ni8 stainless steel
  • High temperature brazing process of super nickel laminated material and Cr18-Ni8 stainless steel

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The super nickel laminated material with a thickness of 2.6mm is butt-brazed with a Cr18-Ni8 stainless steel plate with a thickness of 2.6mm. The length of the connected piece is 30mm and the width is 10mm. The thickness of the cladding layer of the super nickel laminate material is 0.3 mm, and the thickness of the Ni-Cr base layer is 2.0 mm.

[0028] The specific high temperature vacuum brazing process steps are as follows:

[0029] (1) Before welding, place the connected parts in carbon tetrachloride solution for ultrasonic cleaning for 3 minutes, take them out, rinse them with cold water and dry them. Use No. 600 sandpaper to remove the oxide film on the surface of the super nickel laminate material and the stainless steel parts to be connected, rinse with alcohol and blow dry.

[0030] (2) Place the connected parts on the graphite plate of the vacuum chamber covered with mica foil. The function of the mica foil is to prevent the solder and the graphite plate from ...

Embodiment 2

[0035] The super nickel laminate material with a thickness of 3mm is connected at right angles to the Cr18-Ni8 stainless steel with a thickness of 3mm. The length of the connected part is 30mm, the width is 20mm, and the super nickel laminate material is the same size as Cr18-Ni8 stainless steel. The thickness of the cladding layer of the super nickel laminated material is 0.3m, and the thickness of the Ni-Cr alloy base layer is 2.4mm.

[0036] The specific vacuum high temperature brazing process steps are as follows:

[0037] (1) Now grind the laminated composite material and the stainless steel joint to a 45° bevel; place the connected parts in a carbon tetrachloride solution for ultrasonic cleaning for 5 minutes, take them out, rinse them with cold water, and dry them. Use No. 600 sandpaper to remove the super nickel laminate material and the oxide film on the surface of the stainless steel to be brazed, rinse with alcohol and blow dry.

[0038](2) Place the connected par...

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Abstract

The invention discloses a high temperature brazing process of a super nickel laminated material and Cr18-Ni8 stainless steel. The high temperature brazing process comprises the following steps of: (1) cleaning the to-be-brazed surfaces of the super nickel laminated material and the Cr18-Ni8 stainless steel before brazing, removing oil stain and oxide film on the surfaces to be brazed, and drying; (2) filling Ni-Cr-Si-B series paste nickel-based high temperature filler metal between the super nickel laminated material and the Cr18-Ni8 stainless steel; (3) putting the assembled weldment in a vacuum heating furnace for vacuum brazing at a temperature of 1050-1230 DEG C; and (4) controlling the cooling rate, cooling the temperature of a vacuum chamber to be lower than 100 DEG C, and taking the weldment out. By using the vacuum brazing process, a joint with reliable connection, beautiful brazing seam and stable interface bonding can be obtained. The high temperature brazing process meets the requirements for high temperature structural materials in the fields of aerospace, chemical equipment, and the like.

Description

technical field [0001] The invention relates to a brazing process for nickel-based laminated materials, in particular to a high-temperature brazing process for super nickel laminated materials and stainless steel dissimilar materials, and belongs to the technical field of material welding. Background technique [0002] The super nickel laminated material is a new type of composite material formed by isostatic vacuum rolling of the super nickel clad layer and the Ni-Cr alloy base layer. The thickness of the super nickel clad layer of the laminated material is 0.3~0.6mm, The thickness of the -Cr alloy base layer is about 2.0mm. This laminated material combines the respective advantages of super nickel and Ni-Cr superalloy, and can obtain physical and chemical properties that a single material does not have. It is an ideal material for manufacturing engines and power components with high thrust-to-weight ratio. Features of light weight and long service life. [0003] Due to t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K1/19B23K1/20
Inventor 李亚江张永兰吴娜
Owner SHANDONG UNIV
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