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Soldering/diffusion welding hybrid welding method for cemented carbide and alloy steel

A cemented carbide and composite welding technology, used in welding equipment, welding equipment, welding/welding/cutting objects, etc., can solve the problems of large residual stress, uneven heating, and easy damage of joints in vacuum diffusion welding, and achieve solid solution. The effect of strengthening the weld area, low residual stress, and low heating and cooling rates

Inactive Publication Date: 2014-07-30
XIAN UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vacuum furnace welding avoids the disadvantages of uneven heating and serious oxidation of traditional induction brazing or flame brazing, and can play the characteristics of integrated production of welding and heat treatment. However, due to the low strength of vacuum brazing, the residual stress of vacuum diffusion welding is too large , joints are easily damaged and other failure phenomena are still extremely serious, resulting in equipment failures, shutdowns and production shutdowns, resulting in immeasurable economic losses

Method used

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  • Soldering/diffusion welding hybrid welding method for cemented carbide and alloy steel
  • Soldering/diffusion welding hybrid welding method for cemented carbide and alloy steel
  • Soldering/diffusion welding hybrid welding method for cemented carbide and alloy steel

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Effect test

Embodiment 1

[0040] The brazing / diffusion welding composite welding method of cemented carbide and alloy steel of the present embodiment comprises the following steps:

[0041] Step 1. First, the YG8 cemented carbide strip 1 and the 42CrMo alloy steel strip 2 are roughly ground with a grinding wheel, and then polished with 80#, 600# and 1000# metallographic sandpaper in turn, and then processed by alkali cleaning and pickling; The pickled YG8 hard alloy strip 1 is placed in a plating tank filled with nickel-based electroplating solution, with the nickel strip as the anode and the YG8 hard alloy strip 1 as the cathode, at a temperature of 50°C and a current density of 7A / dm 2 , the distance between the nickel strip and the YG8 hard alloy strip 1 is electroplated for 60min under the condition of 40mm, and a nickel coating with a thickness of 50 μm is obtained on the surface of the YG8 hard alloy strip 1; the nickel-based electroplating solution is composed of nickel sulfate, boric acid , th...

Embodiment 2

[0050] The brazing / diffusion welding composite welding method of cemented carbide and alloy steel in this embodiment is the same as that in Embodiment 1, except that the electroplating time in step 1 is 30 minutes, and the thickness of the nickel coating is 10 μm.

Embodiment 3

[0052] The brazing / diffusion welding composite welding method of cemented carbide and alloy steel in this embodiment is the same as that in Embodiment 1, except that the electroplating time in step 1 is 45 minutes, and the thickness of the nickel coating is 30 μm.

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Abstract

The invention provides a soldering / diffusion welding hybrid welding method for a cemented carbide and alloy steel. The method comprises the following steps of: performing the procedures of grinding, alkali washing and acid washing on the YG8 cemented carbide and the 42CrMo alloy steel sequentially, and then, electroplating a nickel coating on the surface of the YG8 cemented carbide; lapping the YG8 cemented carbide and the 42CrMo alloy steel, and paving a copper-based solder foil strip in a lapping area, thus obtaining a whole workpiece; and performing soldering / diffusion welding hybrid welding on the whole workpiece in a vacuum soldering furnace, thus obtaining a soldering / diffusion welding hybrid welding joint of the YG8 cemented carbide and the 42CrMo alloy steel. The welding joint subjected to the soldering / diffusion welding hybrid welding is high in bonding strength and small in residual stress, has a smooth and dense surface, and is smooth and attractive; and moreover, during the welding process, the welded workpiece is not easily oxidized and is subjected to small deformation, the service life of the workpiece is obviously prolonged, and thus the method is an ideal welding technology for realizing dissimilar welding of cutting teeth and cutting tools.

Description

technical field [0001] The invention belongs to the technical field of metal welding, and in particular relates to a brazing / diffusion welding composite welding method of cemented carbide and alloy steel. Background technique [0002] The use of cemented carbide in cutting tools and shearer picks is to use cemented carbide as the blade or tooth head, and steel-based materials with good toughness and comprehensive performance as the tool holder or tooth seat. Such a design, on the one hand, because the cemented carbide is very expensive and the supporting body steel is cheap, can greatly reduce the product cost. On the other hand, the combination of hard and brittle cemented carbide and steel with good strength and toughness can obtain good comprehensive mechanical properties and improve product quality. [0003] Failure analysis of cutting tools and picks has shown that if the weld quality is poor and the workmanship is not correct, the blade or pick will fall off or break ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K28/02B23K1/008B23K1/19B23K1/20B23K20/227B23K103/18
Inventor 孙万昌苗春雨
Owner XIAN UNIV OF SCI & TECH
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