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Hard alloy connecting piece and preparation technique thereof

A hard alloy and preparation technology, which is applied in the direction of manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problems that the tile alloy cannot meet the strength requirements and the hard alloy connectors cannot meet the requirements, and achieve smooth transition and good high temperature Red hardness, high wear resistance effect

Inactive Publication Date: 2008-09-03
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to overcome the deficiencies of the prior art and provide a cemented carbide connector and its preparation process to solve the problem that the existing cemented carbide connector cannot meet the requirements of high-end cemented carbide tools with high precision and high reliability and precision The requirements of instruments and the difficulty that Invar alloys cannot meet the strength requirements of special occasions and the requirements of high temperature red hardness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Select WC-Co cemented carbide with a thickness of 2mm (with a Co content of 18%) as the welded material 1, and select an Invar alloy with a thickness of 2mm (its composition and composition mass percentage are: 42% Ni and 58% Fe) For the material to be welded 2, choose a tungsten argon arc welding machine of the model NASTERTIG AC / DC 2500, and operate according to the conventional argon tungsten arc automatic welding process. The welding process parameters are: welding current 90A, welding voltage 11V, welding speed 4mm / sec, tungsten rod gun tip diameter 0.5~2mm, tungsten rod gun tip extension length 3~8mm, argon gas flow rate 10L / min, argon gas pressure 0.35Mpa at room temperature, welding process adopts direct current connection method.

[0017] After testing: the welded joint between the high-binder phase cemented carbide and the Invar alloy prepared in this example has no air holes, cracks, no η carbide formation at the interface, and the microhardness of the weld zo...

Embodiment 2

[0019] The WC-Co cemented carbide (wherein the Co content is 40%) with a thickness of 2mm is selected as the welded material 1, and the NiFeC-based rare earth Invar alloy with a thickness of 2mm is selected (its composition and composition mass percentage are: 30% Ni, 1 %C, 3.4% Mn, 5% Nb and 60.6% Fe) are the materials to be welded 2, and the argon tungsten arc welding machine model NASTERTIG AC / DC 2500 is selected, and the operation is performed according to the conventional argon tungsten arc automatic welding process. But no pre-weld preheating and post-weld heat treatment, no bevel opening and no filler material added, the welding process parameters are: welding current 180A, welding voltage 20V, welding speed 7mm / sec, tungsten rod tip diameter 0.5~2mm, tungsten The protruding length of the gun tip is 3-8mm, the flow rate of argon gas is 15L / min, the pressure of argon gas is 0.35Mpa at room temperature, and the welding process adopts the direct current connection method. ...

Embodiment 3

[0022] Select WC-Co cemented carbide with a thickness of 4mm (with a Co content of 30%) as the welded material 1, and select a NiFeC-based rare earth Invar alloy with a thickness of 2mm (its composition and composition mass percentage are: 35% Ni, 0.8 %C, 3.4% Mn, 4% Nb and 56.8% Fe) are the materials to be welded 2, and the argon tungsten arc welding machine model NASTERTIG AC / DC 2500 is selected, and the operation is performed according to the conventional argon tungsten arc automatic welding process. But no pre-weld preheating and post-weld heat treatment, no bevel opening and no filler material added, the welding process parameters are: welding current 130A, welding voltage 15V, welding speed 1mm / sec, tungsten rod tip diameter 0.5~2mm, tungsten The protruding length of the gun tip is 3-8mm, the flow rate of argon gas is 3L / min, the pressure of argon gas is 0.35Mpa at room temperature, and the welding process adopts the direct current connection method.

[0023] After testi...

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Abstract

The invention discloses a cemented carbide connector, which is formed by welding a high-cementing-phase cemented carbide with an invar alloy through argon tungsten-arc automatic welding process. The cemented carbide connector not only has high-strength structure by making use of the high strength, high wearing resistance and good red hardness of cemented carbide; but also has low-expansion function by making use of the constant thermal expansion property having invar effect in a specific temperature scope of the invar alloy, therefore the connector meets the special requirements of high-end cemented carbide tool and invar alloy precise instrument for materials, namely the connector has the characteristics of high wearing resistance, good high-temperature red hardness and high-temperature resistance, as well as keeps constant or deforms slightly in a specific temperature scope with the temperature changes. According to welding process of the invention, the interface of the welded sample has no pores, crackles or crisp eta carbide, the microscopic constitution and microhardness which is greater than 400HV0.2 transit smoothly.

Description

technical field [0001] The invention relates to a cemented carbide connector and a preparation process thereof, in particular to a connector of a high-binder phase cemented carbide and Invar alloy and a tungsten argon arc welding process thereof. Background technique [0002] Because WC-Co cemented carbide has high strength, good wear resistance, low thermal expansion coefficient and good high temperature red hardness, it is required that the material has wear resistance, high temperature resistance, and deformation changes with temperature within a certain temperature range. It plays a very important role in the research and development of high-end carbide tools or precision instruments that remain constant or do not change much. However, the tool materials or precision small deformation materials currently used for connection are usually high-speed steel or stainless steel, such as high-speed steel tools, Invar alloy and stainless steel connectors, etc. Most of these cemen...

Claims

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Application Information

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IPC IPC(8): C22C29/02B32B15/01B32B7/00B23K9/167B23K9/23B23K103/18
Inventor 徐培全赵秀娟何建萍
Owner SHANGHAI UNIV OF ENG SCI
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