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Dip brazing method with a preset temperature gradient and special brazing furnace

A technology of immersion brazing and preset temperature, which is applied in the field of brazing furnaces, can solve problems such as unstable product quality, increased energy consumption, environmental pollution, and poor density of brazing seams, so as to ensure quality and stability, eliminate Pore ​​defects, the effect of meeting brazing requirements

Active Publication Date: 2013-04-03
ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the traditional immersion brazing process, the brazing furnace needs to be continuously heated, and the temperature field in the furnace is high in the middle and low on the surface. The removal path of gas impurities is closed, the gas is not easy to discharge, and defects such as pores are formed, causing defects such as poor density of the brazing seam and low brazing rate, and unstable product quality
For weldments with complex shapes, gas discharge is more difficult, and product quality cannot be guaranteed
In order to improve the brazing quality, the commonly used method is to extend the immersion time, which increases energy consumption and environmental pollution.

Method used

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  • Dip brazing method with a preset temperature gradient and special brazing furnace

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Embodiment Construction

[0017] The dip brazing method of the preset temperature gradient of the present invention comprises the following steps:

[0018] In the first step, according to the volume of the workpiece to be brazed, choose to place at least one layer of annular partitions horizontally in the inner cavity of the brazing furnace, so that the inner cavity of the brazing furnace forms at least two relatively independent spaces. If the size is large, the ring-shaped partition can be placed in multiple layers, and the middle aperture of the ring-shaped partition should be able to put the brazing workpiece;

[0019] In the second step, according to the process requirements, use heating bodies with different powers (the heating body can be an induction heating body or an electrode heating body) to heat the upper and lower parts of the brazing furnace separately, so that the molten solder or molten salt in the furnace The spatial distribution divided by the annular partition forms a temperature gr...

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Abstract

The invention discloses a dip brazing method with a preset temperature gradient. The dip brazing method comprises the following steps that firstly, a circular separating plate is horizontally arranged in a brazing furnace, and the inside of the brazing furnace is divided into at least two relatively independent spaces by the circular separating plate; the upper part and the lower part of the brazing furnace are respectively heated by heating bodies in different power, fusion brazing material in the brazing furnace forms a temperature gradient that the temperature is gradually raised from bottom to top, a workpiece is dipped into the fusion brazing material to be brazed, and the temperature each part of the workpiece is the same as the temperature of the fusion brazing material in contact with the workpiece; and the workpiece is slowly moved out, the brazing material at the bottom of the brazed workpiece is firstly solidified, then the brazing material is gradually solidified in an upward sequencing way, and gas in brazing seams is exhausted out in the solidifying process, so as to complete the brazing process. The invention also discloses a special brazing furnace. The dip brazing method and the special brazing furnace have the advantages that the problems of multiple gas holes, low brazing efficiency, instable quality of the product, large energy consumption and the like in the brazed workpiece during dip brazing are well solved; and the structure of the brazing furnace is simple, the operation is convenient, different temperature gradients can be set according to different process requirements, and the brazing requirements of different brazed workpieces are met.

Description

technical field [0001] The invention relates to dip brazing technology, in particular to a dip brazing method with a preset temperature gradient, and also relates to a dedicated brazing furnace for the dip brazing method. Background technique [0002] Dip brazing is a technology that immerses part or the whole of the weldment in molten solder or mixed salt tank, and heats the workpiece to the brazing temperature by means of heat conduction of the liquid medium to achieve brazing. Dip brazing has fast heating speed, uniform heating, high production efficiency, small deformation of welded parts, no obvious grain growth and decarburization, and can protect welded parts from oxidation, and accurate temperature control during brazing (±5 o C), easy to realize mechanization, and is widely used in industry. However, in the traditional immersion brazing process, the brazing furnace needs to be continuously heated, and the temperature field in the furnace is high in the middle a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K1/008B23K3/00B23K3/08
Inventor 龙伟民樊江磊马佳鲍丽沈元勋张青科郭艳红李涛钟素娟刘文明张强
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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