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Brazing method for capillary tube and joint

A brazing method and capillary technology, applied to welding equipment, electric heating devices, auxiliary devices, etc., can solve the problems of insufficient solder distribution and penetration, increased solder viscosity, poor fluidity, etc., to reduce corrosion and improve The effect of brazing rate and reducing welding plugging rate

Active Publication Date: 2020-12-04
郑州郑飞机电技术有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

If the brazing temperature is too high, it will also cause brazing defects such as erosion. If the brazing temperature is too low, the viscosity of the brazing filler metal will increase, the fluidity will become poor, and the wettability will be too weak, resulting in insufficient flow and penetration of the brazing filler metal, making the joint The gaps are not easily filled, resulting in bad joints

Method used

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  • Brazing method for capillary tube and joint
  • Brazing method for capillary tube and joint
  • Brazing method for capillary tube and joint

Examples

Experimental program
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Effect test

Embodiment 1

[0030] A capillary joint brazing method, comprising the following steps: S1, assembling the capillary 2 with the joint 1;

[0031] S2, adding solder 4 to the connection plane between the capillary 2 and the joint 1;

[0032] S3, set the heating coil 3 around the soldering foot for heating to complete the brazing. The heating coil 3 is a two-layer circular coil, the first layer coil 31 is a coil, and the second layer coil 32 is a three-turn coplanar coil ; The first layer of coil 31 is sleeved on the side of the capillary, and the second layer of coil 32 is sleeved on the side of the brazing joint.

[0033] The main heating part of the first-layer coil 31 is the capillary 2 , and the main heating part of the second-layer coil 32 is the welding joint. The circular coil structure can realize uniform heating along the circumference of the capillary 2 .

Embodiment 2

[0035] The difference between this embodiment and embodiment 1 is that: the material of capillary 2 is 1Cr18Ni9Ti, the material of joint 1 is 1Cr18Ni9Ti, and the solder 4 is L303 silver solder welding ring.

Embodiment 3

[0037] The difference between this embodiment and Embodiment 2 is that the outer diameter of the capillary 2 is 0.9 mm, the wall thickness is 0.17 mm, the diameter of the capillary hole 11 of the joint is 1 mm, the brazing depth of a single capillary and the joint 1 is 5 mm, multiple capillary The brazing depth with joint 1 is 6mm.

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Abstract

The invention discloses a brazing method for a capillary tube and a joint. The method includes the following steps that S1, the capillary tube and the joint are assembled; S2, welding flux is added tothe connecting plane of the capillary tube and the joint; and S3, the periphery of a brazing foot is sleeved with a heating coil, heating is conducted, and brazing is completed. According to the brazing method for the capillary tube and the joint, the brazing rate is remarkably increased, corrosion of the wall of the capillary tube is effectively avoided, and the welding blockage rate is greatlyreduced.

Description

technical field [0001] The invention relates to the technical field of welding technology, in particular to a capillary joint brazing method. Background technique [0002] Due to the development of new technologies such as aviation, aerospace, nuclear energy, and electronics, the adoption of new materials and new structural forms has put forward higher requirements for connection technology, brazing technology has developed rapidly, and many new brazing methods have emerged. Its application is also more and more extensive. When brazing, after cleaning the contact surface of the workpiece to be brazed, it is assembled in the form of lap joint, and the solder is placed near the joint gap or directly put into the joint gap. When the workpiece is heated together with the solder to a temperature slightly higher than the melting temperature of the solder, the solder will melt and wet the surface of the weldment. The liquid solder will flow and spread along the joint with the hel...

Claims

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Application Information

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IPC IPC(8): B23K1/002B23K3/047B23K3/08
CPCB23K1/002B23K3/0475B23K3/08
Inventor 陈艳霞史廷弼刘志刚
Owner 郑州郑飞机电技术有限责任公司
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