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A welding method of yg8 cemented carbide and 40cr structural steel

A cemented carbide, welding method technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of low quality stability, large differences in chemical properties, hardened structure and cracks, etc., to improve the joint. Effects of structure and properties, short welding time, and narrow heat-affected zone

Active Publication Date: 2021-07-16
重庆英杰贝尔机械制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the large difference in physical and chemical properties of these two materials, the weldability is very poor, and hardened structures and cracks are easily produced.
The traditional welding method generally adopts brazing, which will generate a lot of stress in the cooling process after brazing, which is easy to cause cracks in the cemented carbide, high energy consumption, large pollution, low efficiency, and low quality stability

Method used

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Examples

Experimental program
Comparison scheme
Effect test

specific Embodiment approach

[0025] A welding method of YG8 cemented carbide and 40Cr structural steel, characterized in that said welding method comprises the following steps:

[0026] Preparation stage: install the flywheel, rotating fixture and moving fixture, pre-treat the 40Cr structural steel and intermediate transition layer metal to be welded, so that the welding surface of the 40Cr structural steel forms a stepped hole, and wait for the oil temperature in the hydraulic system of the inertial friction welding equipment to rise to 25-45°C; place the 40Cr structural steel in a heating furnace to preheat to 300°C, and keep it warm for 30-50 minutes;

[0027] Welding stage: place the metal material of the intermediate transition layer in the step hole of the welding surface of the 40Cr structural steel, fix the YG8 hard alloy and the 40Cr structural steel with a rotating fixture or a moving fixture respectively, and move the slide table to make the YG8 hard alloy and 40Cr The welding surface of the st...

Embodiment 1

[0044] A welding method of YG8 hard alloy and 40Cr structural steel comprises the following steps: the welding part is selected as YG8 hard alloy with a diameter of 24mm and matching 40Cr structural steel,

[0045]Preparatory stage: install the flywheel, rotating fixture and moving fixture, select YG8 hard alloy with a diameter of 24mm, and process the 40Cr structural steel and intermediate transition layer metal that need to be welded, so that the welding surfaces of YG8 hard alloy and 40Cr structural steel are parallel to each other , so that the welding surface of the 40Cr structural steel forms a step hole, and the area of ​​the metal material of the intermediate transition layer is equal to the area of ​​the step hole, and then carries out surface flaw detection on the YG8 cemented carbide. Wait for the oil temperature in the hydraulic system of the inertial friction welding equipment to rise to 30°C; place the 40Cr structural steel in a heating furnace to preheat to 300°C...

Embodiment 2

[0049] A welding method of YG8 hard alloy and 40Cr structural steel comprises the following steps: the welding part is selected as YG8 hard alloy with a diameter of 24mm and matching 40Cr structural steel,

[0050] Preparation stage: install flywheel, rotating fixture and moving fixture, process the 40Cr structural steel and intermediate transition layer metal that need to be welded, make the welding surfaces of YG8 cemented carbide and 40Cr structural steel parallel to each other, and make the welding surface of 40Cr structural steel form a step The area of ​​the metal material of the middle transition layer is equal to the area of ​​the step hole, and then the surface flaw detection is carried out on the YG8 cemented carbide. Wait for the oil temperature in the hydraulic system of the inertial friction welding equipment to rise to 30°C; place the 40Cr structural steel in a heating furnace to preheat to 300°C, keep it warm for 40 minutes, and prepare for welding.

[0051] Wel...

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PUM

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Abstract

Aiming at the problems of YG8 cemented carbide and 40Cr structural steel, which have great differences in physical and chemical properties, poor weldability, and easy to produce hardened structures and cracks, the invention provides a combination of YG8 cemented carbide and 40Cr structural steel. The welding method, the welding method uses the inertia friction welding technology, comprising the following steps: in the preparation stage, the 40Cr structural steel and the transition layer metal to be welded are pretreated; in the welding stage, the transition layer metal material is placed on the welding surface. In the above-mentioned step hole, move the slide table to make the welding surface of YG8 cemented carbide and 40Cr structural steel contact, and start the welding procedure; in the stress-removing stage, put the welded product into the heating furnace, heat up to 500°C with the furnace and Keep it warm for 3-6 hours, then cool down with the furnace to ≤150°C, and then take it out of the furnace and air-cool it. The present invention uses the inertial friction welding technology, the welding instant temperature rises quickly, the welding time is short, the heat-affected zone is narrow and the structure is not obviously coarsened, and the deterioration of the joint structure and the generation of brittle phase are largely avoided.

Description

technical field [0001] The invention relates to the technical field of inertial friction welding, in particular to a welding method of YG8 hard alloy and 40Cr structural steel. Background technique [0002] YG8 cemented carbide materials are often welded to 40Cr structural steel. The main component of YG8 cemented carbide is tungsten carbide particles, 8% cobalt is added as a binder, and its density is 14.5g / cm 3 , the hardness is HRC79, and the linear expansion coefficient is 1 / 3 of 40Cr structural steel. Due to the large difference in physical and chemical properties of these two materials, the weldability is very poor, and hardened structures and cracks are easily produced. The traditional welding method generally uses brazing, which will generate a lot of stress during the cooling process after brazing, which will easily cause cracks in the cemented carbide, high energy consumption, large pollution, low efficiency, and low quality stability. Now cemented carbide is use...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/24B23K20/12B23K20/26
CPCB23K20/12B23K20/129B23K20/24B23K20/26
Inventor 周跃宏
Owner 重庆英杰贝尔机械制造有限公司