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WC particle in-situ reinforced hard alloy and steel ultrasonic soldering method

A technology of cemented carbide and brazing method, which is applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc., and can solve the problems of complex preparation of special brazing material, poor impact load resistance, and complex brazing process. , to achieve the effect of high quality brazing, low cost and improved mechanical properties

Active Publication Date: 2015-07-15
SOUTHWEST JIAOTONG UNIV
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  • Abstract
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Problems solved by technology

[0007] The invention aims to solve the problems of low strength of welded joints of cemented carbide tamping tools, poor impact load resistance, poor wettability, complicated preparation of special brazing filler metals, complicated brazing process, etc., and provides a cemented carbide tamping tool. Novel ultrasonic brazing method for in-situ reinforcement of tool-welded WC particles

Method used

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  • WC particle in-situ reinforced hard alloy and steel ultrasonic soldering method
  • WC particle in-situ reinforced hard alloy and steel ultrasonic soldering method
  • WC particle in-situ reinforced hard alloy and steel ultrasonic soldering method

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Embodiment Construction

[0017] Such as figure 1 As shown, the embodiment of the present invention is carried out according to the following steps: a, before brazing, grind the surfaces of cemented carbide 1 and steel 2 to be connected respectively, and clean the polished surface with acetone; b, before brazing Place the Ag-based solder foil 3 between the cemented carbide 1 and the steel 2; c, place the ultrasonic head 4 on the surface of the cemented carbide 1 and apply ultrasonic vibration to the cemented carbide and steel to be welded at a temperature of 380°C 5min; d, the brazing process adopts high-frequency induction heating; e, the ultrasonic vibration ends the natural cooling, and the weld seam reinforced by WC ceramic particles is obtained.

[0018] The microstructure (SEM morphology) of the brazed joint obtained in this embodiment is shown in figure 2 , the double-sided interface structure see image 3 , it can be seen that the interface is well bonded, and white WC particles migrating fr...

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Abstract

The utility model discloses a WC particle in-situ reinforced hard alloy and steel ultrasonic soldering method, which is used for the high-quality soldering of a sheet hard alloy and steel. The method comprises the following steps: a, polishing a surface to be connected before soldering, and cleaning the polished surface with acetone; b, placing an Ag-based solder foil piece between the hard alloy and the steel before soldering; c, applying ultrasonic vibration to the hard alloy to be soldered and the steel to be soldered; d, implementing a soldering process by adopting a common heat source manner common in furnace soldering or high-frequency induction heating soldering and the like, wherein soldering temperature is 730 to 850 DEG C; e, after ultrasonic vibration, WC particle reinforced soldering seams are obtained by naturally cooling. According to the method, Co substrate adhesion-free WC particles are migrated into the soldering seams to form WC particle reinforced soldering seams by virtue of disturbance action of ultrasonic waves after a Co substrate in the hard alloy is dissolved by a solder, so that the mechanical performance of a joint is greatly improved; oxide films on the surfaces of the hard alloy and the steel are removed by virtue of action of ultrasonic cavitation, and soldering can be implemented in the atmosphere without a soldering flux, so that the process is simple, and the method is environment-friendly, high in welding efficiency and suitable for engineering application.

Description

technical field [0001] The invention relates to a brazing process of cemented carbide and steel, in particular to an ultrasonic brazing method of cemented carbide and steel reinforced in situ by WC particles. Background technique [0002] In recent years, with the rapid development of my country's transportation industry, the application of large-scale tamping construction machinery has become increasingly widespread. Cemented carbide is one of the most important components of tamping tool products. The overall level of cemented carbide tools in my country is far behind that of foreign countries, and the welding technology of cemented carbide tools has become a key technology that limits its development. [0003] The most important problems in the welding of cemented carbide tools are as follows. First, the wettability of the solder to the WC ceramic particles in the cemented carbide is poor, resulting in low interface connection strength. The second is that Ag-based solde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/06B23K1/20
CPCB23K1/06B23K1/206B23K2103/18
Inventor 李远星朱宗涛陈辉赵旭何永攀李俊甫
Owner SOUTHWEST JIAOTONG UNIV
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