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Welding flux for large hard alloy cutter welding

A technology of cemented carbide and cutting tools, which is applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc. It can solve the problems of affecting welding quality, affecting flux wetting quality, long preheating process time, etc., to achieve good wetting wet effect effect

Active Publication Date: 2017-01-11
ZHUZHOU HARD ALLOY GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The welding preheating process of large cemented carbide tools takes a long time, and the stay time at 400~600°C is long, which causes the copper flux to harden and turn yellow and oxidize before melting, which affects the wetting quality of the flux
At the same time, the alloy blade also has oxides; when the welding seam of the tool reaches the flux melting point temperature of 700~800°C, these oxides will hinder the flow of the flux and affect the welding quality

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0009] In each embodiment, the weight percentage compositions of copper flux and silver flux in the flux are shown in Table 1 respectively:

[0010] Table 1 Composition of copper flux and silver flux weight percentage in flux

[0011] percent 1 percent 2 percent 3 percent 4 percent 5 percent 6 Copper flux QJ301 ＞85% 85~75% 80% 74~50% 49~20% ＜20% Silver solder QJ102 ＜15% 15~25% 20% 26~50% 51~80% ＞80%

[0012] Embodiments 1-6 are based on welding YG8 large-scale hard alloy cutting tools as an example, and the weight percentages of copper flux and silver flux in the flux in Embodiments 1-6 correspond to percentages 1-6 respectively. Comparison of solder wettability in different embodiments is shown in Table 2:

[0013] Table 2: Comparison of wettability of different fluxes when welding YG8 large carbide tools

[0014] soldering temperature 200℃ 300℃ 400℃ 500℃ 600℃ 700℃ 800℃ 900℃ 950℃ Example 1 10 10 10 1...

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PUM

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Abstract

The invention discloses a novel welding flux for large hard alloy cutter welding, having a good wetting effect and capable of protecting welding joints. The welding flux is prepared from, by weight, a copper welding flux 75-85% and a silver welding flux15-25%. Preferably, the copper welding flux is QJ301, the silver welding flux is QJ102, and the best weight percentage is 80% and 20%. The welding flux has the best spreading wettability, the wetting time is also kept long, the weld joints can be better protected against oxidation, quick welding completion can be also promoted, the welding time can be shortened, and the welding quality can be ensured.

Description

technical field [0001] The invention relates to a flux for hard alloy welding, in particular to a flux for welding large hard alloy cutting tools. Background technique [0002] In the cemented carbide brazing process, the role of flux is: 1. Assist heat conduction; 2. Remove oxides around the weld; 3. Reduce the surface tension of the material to be welded; 4. Remove oil on the surface of the material to be welded, increasing Welding area; 5, to prevent re-oxidation. In addition, two important technical indicators of flux should be considered: wettability and volatilization temperature of flux. These two technical indicators directly affect the fluidity and soldering quality of the solder. [0003] When welding large carbide tools, HS221 copper solder and QJ301 copper flux are commonly used. The welding preheating process of large cemented carbide tools takes a long time, and the stay time at 400-600 °C is long, which causes the copper flux to harden and turn yellow and o...

Claims

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Application Information

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IPC IPC(8): B23K35/30
CPCB23K35/302
Inventor 马亚
Owner ZHUZHOU HARD ALLOY GRP CO LTD