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Method for soldering and welding hard alloy/steel compound tappet of engine by high-frequency induction

A high-frequency induction brazing and hard alloy technology, which is applied in the direction of welding/welding/cutting items, welding equipment, metal processing equipment, etc., can solve the problems of low bending strength of joint parts, high requirements for production equipment, and high production costs , to achieve the effect of improving welding quality, reducing production cost, and shortening the liquefaction process

Inactive Publication Date: 2011-09-14
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the existing welding cemented carbide / steel composite tappet method has high requirements for required production equipment, high production cost, and the interface is easy to form harmful η phase, resulting in low bending strength of the joint, providing A method for high-frequency induction brazing welding engine cemented carbide / steel composite tappet

Method used

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  • Method for soldering and welding hard alloy/steel compound tappet of engine by high-frequency induction
  • Method for soldering and welding hard alloy/steel compound tappet of engine by high-frequency induction
  • Method for soldering and welding hard alloy/steel compound tappet of engine by high-frequency induction

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specific Embodiment approach 1

[0009] Specific embodiment one: the method for middle and high frequency induction brazing welding engine cemented carbide / steel composite tappet of this embodiment is to be finished by the following steps: : after the mass ratio of 1 is mixed, solder paste is obtained; Step 2, removes the oxide film on steel and hard alloy connection surface, then wipes with acetone (removes the greasy dirt on steel and hard alloy strip welding surface); Step 3, puts The solder paste prepared by step 1 is scraped and coated between the cemented carbide after step 2 processing and the connecting surface of steel to obtain the workpiece to be welded composed of cemented carbide-brazing paste-steel; step 4, the step 3. Put the parts to be welded into the quartz glass vacuum tube, seal the two ends with graphite columns and fix the parts to be welded, and then use high-frequency induction heating equipment to heat the parts to be welded under argon atmosphere for brazing: first use 7 The heating ...

specific Embodiment approach 2

[0010] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the Ni-Cr-Si-B brazing filler metal described in step one is made of 7.0% Cr, 4.5% Si, 3.1% B, 3.0% Fe by weight percentage , 0.01% to 0.1% C and the rest of Ni. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0011] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is that the binder described in step one consists of 0.8% to 1.2% glycerol and 1.6% to 2.4% hydroxyethyl Cellulose, 0.8%-1.2% carboxymethyl cellulose and 95.6%-96.4% distilled water. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention discloses a method for soldering and welding a hard alloy / steel compound tappet of an engine by high-frequency induction, relating to a method for welding a hard alloy / steel compound tappet of an engine. The invention solves the problems of high requirements of required production equipment and high production cost and the problem that an interface is easy to form harmful Eta phasesto cause low anti-bending intensity of the combining part existing in the traditional method for welding the hard alloy / steel compound tappet. In the method of the invention, steel and hard alloy aresoldered and welded into a whole in vacuum through high-frequency induction heating. The method of the invention realizes the partial heating on the joint of the hard alloy and the steel to prevent the growing of crystal particles due to the overheating of other wear-resistant parts of the tappet to result in performance degradation; the method combines the Eta phases in dispersive distribution to eliminate the interface embrittlement of joints caused by the Eta phases and simultaneously increases the mechanical properties of soldering seams, and the shearing intensity of the joints reaches 450 MPa; and the method has low cost and is suitable for mass production. The compound tappet prepared by using the method of the invention can be widely applied to the fields of automobiles, airplanes, and the like.

Description

technical field [0001] The invention relates to a welding method for an engine cemented carbide / steel composite tappet. Background technique [0002] The tappet is one of the key components in the valve shunt system of engines such as automobiles and airplanes. The wear resistance of the tappet has an important impact on the power, fuel efficiency, and maintenance of the engine. With the development of industry, higher engine power and higher fuel efficiency are required, which put forward higher requirements for the wear resistance of tappets. [0003] At present, cemented carbide is combined with steel metallurgy, and cemented carbide is used as the easy-wearing working part of the tappet, so that the composite component has obtained the high hardness and high wear resistance of cemented carbide and the high strength and high toughness of steel. The excellent performance overcomes the weaknesses of the two, and fully meets the performance of the engine tappet. Therefore,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/002B23K1/20B23K103/18
Inventor 李卓然于康刘兵冯吉才刘羽樊建新吴广东
Owner HARBIN INST OF TECH
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