Induction brazing temperature field control method with selective wetting effect

A control method and induction brazing technology, which are applied to the brazing connection of dissimilar material joints and the field of induction brazing temperature field control, can solve the problems of inability to obtain intact welding parts and different wettability of brazing materials, and achieve easy automation. Simple production, method, and effect of improving uneven wettability

Active Publication Date: 2012-11-21
ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is just to solve the problem that in the prior art, when induction brazing heterogeneous material joints, the wettability of the brazing filler metal in the heterogeneous base metal matrix is ​​different, resulting in the inability to obtain a complete weldment, and to provide a method by adjusting the brazing temperature Field control method to improve the difference in solder wettability——Induction brazing temperature field control method with selective wetting effect

Method used

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  • Induction brazing temperature field control method with selective wetting effect
  • Induction brazing temperature field control method with selective wetting effect

Examples

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Effect test

Embodiment 1

[0034] Induction Brazing Manufacturing of Carbide Saw Blades:

[0035] 1. The cleaned workpieces 4 are hard alloy YG8, and 6 is steel substrate (65Mn steel). Butt joints are used, and flux is applied to the welding surfaces of hard alloy and 65Mn steel respectively, and brazing sheets (silver-based Solder tab) 5;

[0036] 2. Press cemented carbide 4, brazing sheet 5 and 65Mn steel 6 into figure 1 After the sequence shown is assembled and installed in the center position of the induction heating coil 3 of the high-frequency induction brazing equipment;

[0037] 3. Clamp the hard alloy in the copper alloy cooling fixture 1 and fasten it mechanically; the copper alloy fixture is processed from pure copper or high thermal conductivity copper alloy; the diameter of the water hole 2 arranged on the copper alloy fixture is 10mm, the ports at both ends are connected to the circulation pipeline, and a flow valve is set in the circulation pipeline to control and adjust the flow rat...

Embodiment 2

[0042] Induction brazing of copper to stainless steel:

[0043] 1. The workpieces 7 to be cleaned to be welded are 1Cr18Ni9Ti stainless steel pipes, and 8 are pure copper pipes. Butt joints are used, and flux is applied to the welding surfaces of copper and stainless steel pipes respectively, and brazing welding pieces (silver-based welding pieces) 5 are preset;

[0044] 2. Press the copper tube, solder lug and stainless steel tube into the figure 2 After the sequence shown is assembled and installed in the center position of the induction heating coil 3 of the high-frequency induction brazing equipment;

[0045] 3. Fasten the stainless steel tube in the copper alloy cooling fixture 1; the copper alloy fixture is processed from pure copper or high thermal conductivity copper alloy; the diameter of the water hole 2 arranged on the copper alloy fixture is 20 mm, and the two ends The port is connected to the circulation pipeline, and a flow valve is set in the circulation pi...

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Abstract

The invention discloses an induction brazing temperature field control method with a selective wetting effect. The control method comprises the following steps: washing a workpiece prior to welding; coating preset solder and welding flux and assembling the workpiece at a connector welding area; putting a welding area of the workpiece to be welded at a center part of an induction ring of a high frequency induction brazing machine; clamping a copper alloy cooling clamp at one end of a base metal of which the brazing temperature needs to be reduced in a mechanical fastening mode; starting a power supply of the high frequency induction brazing machine and opening a switch of the cooling clamp clamped on the workpiece at the same time; adjusting the flow of a cooling medium and heating the workpiece to be welded for 5-60 seconds; keeping the temperature for 5-30 seconds after a brazing filler metal is melted and spread out; closing the power supply of a sensing welding machine and closing a cooling clamp circulating system after the welding; and taking out the workpiece when the workpiece is cooled. By controlling the gradient temperature fields at two ends of the base metal of the connector, the temperature of the base metal at one side with better brazing filler metal wetness is 20-50 DEG C lower than the temperature of the other side, so that the wetness difference of the brazing filler metal at the substrate of the base metal, and the welding-on rate and the performance of the connector are improved.

Description

technical field [0001] The invention relates to an induction brazing temperature field control method with selective wetting effect, which is mainly used for the brazing connection of heterogeneous material joints and belongs to the field of welding technology. Background technique [0002] Induction brazing is widely used in the manufacture of diamond and hard alloy tools as well as steel, copper alloy, stainless steel, superalloy, etc. It has the characteristics of fast heating speed, high production efficiency, and local heating. [0003] However, when induction brazing dissimilar material joints, due to the fast heating rate, there is a difference in the wettability of the solder on the heterogeneous welding base metal. This difference often makes the solder have excellent wettability on one side, while on the other The wettability of one side is poor, and this uneven wetting leads to problems such as low welding rate and low mechanical strength of the joint. [0004] T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/002B23K1/19B23K3/08
Inventor 沈元勋龙伟民张雷鲍丽李秀朋朱坤佘春刘文明丁天然王星星
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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