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Method for vibration-assisted induction brazing

An induction brazing and auxiliary vibration technology, which is applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve problems such as brazing seam defects and poor brazing seam density, and achieve good brazing seam density and shear strength Improvement, brazing material flow spread and the effect of rapid flow improvement

Inactive Publication Date: 2012-11-21
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

[0006] The purpose of the present invention is to provide a method for assisting vibration induction brazing in view of the problems that induction brazing is prone to produce defects in the brazing seam and the density of the brazing seam is poor.

Method used

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  • Method for vibration-assisted induction brazing
  • Method for vibration-assisted induction brazing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] like figure 1 Shown, the method for auxiliary vibration induction brazing of the present invention comprises the steps:

[0029] (1) The clean workpiece 5 to be welded is a stainless steel plate (150mm×30mm×3mm), lap joints, and pre-set flux and copper-based powdered solder 8 at the joints;

[0030] (2) Pass the workpiece to be welded through the induction coil 7 and place it horizontally on the vibration table 3, cooperate with the gasket 4 with a thickness of 3mm, so that the position to be welded is in the center of the induction coil; tighten the fastening screws 6 at both ends to fix it ;

[0031] (3) Start the water-cooling system, and start the high-frequency power supply of the induction brazing machine, and heat the workpiece to be welded for 15s;

[0032] (4) The solder is melted and spread, and the mechanical vibrator is turned on for 3s, with an amplitude of 4μm and a vibration frequency of 25kHz;

[0033] (5) Stop the vibration, keep warm for 10s, let th...

Embodiment 2

[0037] to combine figure 1 and figure 2 , changing the lap joint of the stainless steel plate into a copper pipe fitting sleeve 9, and pre-setting flux and paste copper-based solder 10 at the joint, including the following steps:

[0038] (1) The clean workpiece 9 to be welded is a socketed copper pipe fitting, in which pipe A: inner diameter 30mm, outer diameter 33mm; pipe B: inner diameter 27.5mm, outer diameter 29.5mm, pre-set flux and paste copper at the joint Base solder 10;

[0039] (2) Pass the workpiece to be welded through the induction coil 7 and place it horizontally on the vibrating table 3. The end of the tube B is fitted with a gasket 4 with a thickness of 1.5mm, so that the position to be welded is in the middle of the induction coil; tighten the fastening screws at both ends 6 fix it;

[0040] (3) Start the water cooling system, and start the high-frequency power supply of the induction brazing machine, and heat the workpiece to be welded for 25s;

[0041]...

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Abstract

A method for vibration-assisted induction brazing includes the following steps that firstly, brazing flux is coated at a lap joint position of a clean work piece to be welded, and a brazing filler metal is preset at the lap joint position of the clean work piece to be welded; secondly, the work piece to be welded penetrates through an induction coil which is connected with a high-frequency power supply and located in the middle of a vibration table of a vibration-assisted high-frequency induction brazing machine, the work price to be welded is matched with a gasket with corresponding thickness to be horizontally placed on the vibration table, the lap joint position of the work piece to be welded is located at the center of the induction coil, and the work piece is horizontally fixed on the vibration table through fasteners at two ends of the vibration table; thirdly, the power supply of the high-frequency induction brazing machine and a water-cooling system are started, and the work piece to be welded is heated for 5-40s; fourthly, when the brazing filler metal is melted and spread, a mechanical vibration gauge is started to drive the vibration table to vibrate for 2-10s; fifthly, vibration is stopped, and heat preservation is performed for 5-30s to enable the brazing filler metal flows and spreads into gaps; and sixthly, the power supply of the high-frequency induction brazing machine is shut down, and the work piece is taken out when the work piece is cooled. The method for the vibration-assisted induction brazing is capable of obviously reducing defects that air holes, slag inclusion and poor gap filling exist in brazing seams and improving compactness of the brazing seams and mechanical performances of the joint.

Description

technical field [0001] The invention belongs to the field of welding technology, and relates to a method for assisting vibration induction brazing, and is especially suitable for high-quality requirements of induction brazing for weldments with symmetrical shapes. technical background [0002] Induction brazing has the characteristics of fast heating speed and local heating. It is widely used for brazing steel, copper and copper alloys, stainless steel, high-temperature alloys and other symmetrically shaped weldments. It is especially suitable for pipes, flanges, and pipe fittings. , shaft and sleeve joints, etc. [0003] However, due to the fast heating and cooling speed during local induction brazing, the liquid solder often cannot be fully spread into the gap, resulting in poor gap filling; Overheating is more likely to cause defects such as pores and slag inclusions in the brazing seam, which seriously affects the compactness of the brazing seam, and then affects the me...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/06B23K1/002
Inventor 钟素娟龙伟民孙华为马佳裴夤崟薛行雁刘文明齐剑钊佘春张冠星
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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