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A kind of gradient material method brazing method for stainless steel and hard alloy

A technology of cemented carbide and gradient materials, applied in the direction of welding medium, welding/cutting medium/material, welding equipment, etc., can solve the problems of large residual stress in welded joints, etc., to ensure welding quality, improve mechanical properties, and eliminate welding defects Effect

Active Publication Date: 2019-05-24
哈尔滨工大华策科技有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem that a large number of welding defects are formed in the welding joint and the residual stress of the welding joint is relatively large in the existing brazing connection technology of cemented carbide and stainless steel, the present invention proposes a gradient material method for brazing stainless steel and Carbide method;

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  • A kind of gradient material method brazing method for stainless steel and hard alloy

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specific Embodiment approach 1

[0026]Specific implementation mode one: combine figure 1 Describe this embodiment, this embodiment is a method for brazing stainless steel and cemented carbide by gradient material method. The method is specifically carried out according to the following steps:

[0027] 1. Add 10-30wt% reinforcement particles to the solder powder to obtain composite solder powder with high reinforcement content, and add 1-10 wt% reinforcement particles to the solder powder to obtain composite solder powder with low reinforcement content powder;

[0028] 2. Put the composite solder powder with high reinforcement content and the composite solder powder with low reinforcement content into the stainless steel mixing tank respectively, and stir for 1 to 3 hours at a speed of 250 to 300 rpm;

[0029] 3. Put the composite solder powder with high reinforcement content and the composite solder powder with low reinforcement content obtained in step 2 respectively into a mortar, and add 1 to 10 wt% liqu...

specific Embodiment approach 2

[0039] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the solder powder in step 1 is Ni-Cr-B-Si alloy powder, Ni-Cr-B-Si-Mo alloy powder or Ni-Cr - B-Si-Mo-Cu alloy powder. Other steps and parameters are the same as those in the first embodiment.

specific Embodiment approach 3

[0040] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that the reinforcement particles in Step 1 are SiC particles, WC particles or Cr particles. 3 C 2 particles. Other steps and parameters are the same as those in Embodiment 1 or 2.

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Abstract

The invention provides a method for brazing stainless steel and cemented carbide through a gradient material method and relates to the method for brazing the stainless steel and cemented carbide. The method aims at solving the problems that by means of an existing cemented carbide and stainless steel brazing connecting technology, a lot of welding defects are formed and residual stress of welding joints is large in the welding process of the welding joints. The method comprises the steps of firstly, preparing composite solder powder; secondly, performing stirring; thirdly, preparing composite solder foil; fourthly, cleaning and stacking the stainless steel, the cemented carbide, interlayer metal and the composite solder powder into a graphite clamp and obtaining a part to be welded; and fifthly, performing brazing. According to the method, by the adoption of the gradient material method, auxiliary brazing is conducted on the cemented carbide and the stainless steel, through the gradient material method, the influence brought by the difference of the linear expansion coefficients is relieved greatly, the residual stress is reduced, and the welding defects are eliminated. The method is suitable for brazing of the stainless steel and the cemented carbide.

Description

technical field [0001] The invention relates to a method for brazing stainless steel and hard alloy by gradient material method. Background technique [0002] Cemented carbide is an alloy obtained by powder metallurgy from high-hardness and high-strength metal carbides and metals such as Fe, Co, and Ni. The carbide in this alloy makes the alloy have high hardness and wear resistance, and the metal matrix in this alloy gives the alloy good red hardness and thermal conductivity; due to its superior properties, it is used to make cutting tools, Knives and wear-resistant parts are known as "industrial teeth". This alloy is also widely used in various industries such as military industry, aerospace, machining, oil drilling, construction, and mining tools. Although cemented carbide has the above outstanding excellent properties, but its impact toughness is poor and expensive, it is difficult to apply it to machinery as a whole. Therefore, in the prior art, it is mostly used to co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/20B23K35/40B23K103/18
CPCB23K1/008B23K1/20B23K1/206B23K35/40B23K2103/18
Inventor 岳立林
Owner 哈尔滨工大华策科技有限公司
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