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A resistance brazing method and device using graphite electrodes

A technology of resistance brazing and graphite electrodes, which is applied in welding equipment, welding/welding/cutting items, manufacturing tools, etc., can solve the problem of the decline in the quality of hard alloy products, the decline in the yield and service life of hard alloy brazing workpieces, etc. problems, to achieve the effect of strong combination reliability, low brazing cost, and improved overall performance

Active Publication Date: 2016-05-11
ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Mn, Co, and Cr elements contained in these solders belong to active elements (the active elements mainly include Ti, Zr, Cr, W, Co, Mo, Mn, V, Nb, etc.), and the active elements are very active in the brazing process. It is easy to absorb the active gas oxygen in the surrounding air, and it will exist in the brazing seam of the cemented carbide brazing part in the form of oxygen pores during the brazing process. Defects lead to a serious decline in the quality of brazed carbide products, and the yield and service life of cemented carbide brazed workpieces are greatly reduced

Method used

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  • A resistance brazing method and device using graphite electrodes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] In the first step, the YG15 hard alloy brazing parts 4, 45 to be brazed # The surface of the carbon steel brazing part 7 is cleaned with dilute hydrochloric acid or sodium hydroxide aqueous solution, the surface oxide film is removed, and cleaned by wiping with acetone;

[0030] In the second step, the B-Mn50NiCuCrCo solder 5 used for brazing with a thickness of 0.3mm is first polished with sandpaper to remove the surface oxide film, and then wiped clean with acetone;

[0031] The third step is to first place the 45 that needs to be brazed # Put the carbon steel brazing piece 7 into the brazing chamber 1, then place the manganese-based B-Mn50NiCuCrCo brazing material 5 on the corresponding position of the carbon steel brazing connection, and spread a small amount of 102 flux on the brazing material, and then put the YG15 Carbide brazing parts 4 are placed on the solder;

[0032] The fourth step is to operate the resistance brazing device, set the welding current to 12...

Embodiment 2

[0035] In the first step, the surfaces of the YG3 hard alloy brazing parts 4 and 40Cr alloy steel brazing parts 7 to be brazed are cleaned with dilute hydrochloric acid or sodium hydroxide aqueous solution, the surface oxide film is removed, and cleaned by wiping with acetone;

[0036] In the second step, the B-Mn65NiCoFeB solder 5 used for brazing with a thickness of 0.1mm is first polished with sandpaper to remove the surface oxide film, and then wiped clean with acetone;

[0037]In the third step, the 40Cr alloy steel brazing piece 7 that needs to be brazed is put into the brazing chamber 1, then the manganese-based B-Mn65NiCoFeB brazing filler metal 5 is placed on the corresponding position of the carbon steel brazing connection, and the brazing Sprinkle a small amount of 102 flux on the material, and then put the YG3 cemented carbide brazing piece 4 on the solder;

[0038] The fourth step is to operate the resistance brazing device, set the welding current to 10000A, set ...

Embodiment 3

[0041] The first step, the YT5 cemented carbide brazing parts 4, 40 to be brazed # The surface of the carbon steel brazing part 7 is cleaned with dilute hydrochloric acid or sodium hydroxide aqueous solution, the surface oxide film is removed, and cleaned by wiping with acetone;

[0042] In the second step, the B-Mn50NiCuCrCo solder 5 used for brazing with a thickness of 0.05mm is first polished with sandpaper to remove the surface oxide film, and then wiped clean with acetone;

[0043] The third step is to first place the 40 that needs to be brazed # Put the carbon steel brazing piece 7 into the brazing chamber 1, then place the nickel-based B-Ni75CrSiB solder 5 on the corresponding position of the carbon steel brazing connection, and spread a small amount of 102 flux on the solder, and then put the YT5 Carbide brazing parts 4 are placed on the solder;

[0044] The fourth step is to operate the resistance brazing device, set the welding current to 7000A, set the welding tim...

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Abstract

The invention discloses a resistance soldering method using a graphite electrode and a resistance soldering device. According to the resistance soldering method, the graphite electrode serves as a resistance soldering heating element which is used for soldering a hard alloy workpiece; the hard alloy soldered workpiece is placed in a closed steel soldering chamber; and when the graphite electrode is electrified and heated, carbon in the graphite electrode and oxygen surrounding the hard alloy soldering workpiece react chemically, so that oxygen in a local area at a soldering connection position is consumed. Oxygen-free porosity of a soldering connection brazing seam region between hard alloy and a steel substrate or between one piece of hard alloy and another piece of hard alloy can be realized, temperature fields of soldering connection portions are uniform, heating time is short, and efficiency is high. A graphite protecting device sleeves the graphite electrode and protects the graphite electrode from being damaged during resistance soldering pressurization. A pressure controller is arranged on the graphite electrode, pressure on the different soldering connection portions is not increased after the pressure of the graphite electrode reaches to a certain degree, and different demands of different soldering workpieces on external pressure are met.

Description

technical field [0001] The invention relates to the field of hard alloy welding, in particular to a resistance brazing device for hard alloy workpieces and a method for brazing hard alloy workpieces using the device. Background technique [0002] Cemented carbide is mainly composed of high-hardness refractory metal carbide (WC, TiC) micron-sized powder, with cobalt (Co) or nickel (Ni), molybdenum (Mo) as binder, in a vacuum furnace or hydrogen Powder metallurgy products sintered in a reduction furnace. Cemented carbide has excellent properties such as high wear resistance, heat resistance, corrosion resistance and good red hardness, and is widely used in industrial fields such as mechanical processing, geological exploration, and mining. With the rapid development of the national manufacturing industry, the demand for various tools and products made of cemented carbide is increasing day by day. However, because it is difficult to manufacture products with complex shapes an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/00B23K1/19B23K1/20B23K3/00
CPCB23K1/0004B23K1/19B23K1/20B23K3/00B23K2103/18
Inventor 马力龙伟民钟素娟张青科丁天然孙华为佘春刘洁宋友宝于奇
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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