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A surface tinning method suitable for stainless steel pipe fittings

A technology for stainless steel and pipe fittings, applied in applications, household appliances, tubular objects, etc., can solve the problems of discontinuous tin layer and uneven thickness, and achieve the effect of reducing surface tension, continuous and uniform tin layer, and promoting wetting and spreading ability.

Active Publication Date: 2016-01-27
CAPITAL AEROSPACE MACHINERY +1
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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 surface tinning method suitable for stainless steel pipe fittings, which can solve the problems of discontinuous tinning layer and uneven thickness of stainless steel pipe fittings before brazing

Method used

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  • A surface tinning method suitable for stainless steel pipe fittings
  • A surface tinning method suitable for stainless steel pipe fittings
  • A surface tinning method suitable for stainless steel pipe fittings

Examples

Experimental program
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Effect test

example 1

[0040] Example 1: Hanging tin on stainless steel pipe fittings with Ф60mm inner diameter

[0041] (1) clean up

[0042] Stainless steel pipe fittings 1 outer diameter ФW=Ф68, inner diameter ФN=Ф60, wall thickness 4mm. Grind the place where the tin is to be hung with fine sandpaper, the grinding height Hq is 9mm, and it can be bright; clean the stainless steel pipe fitting 1 with gasoline first, then clean it with alcohol and dry it.

[0043] (2) Nickel plating

[0044] The stainless steel pipe fittings are nickel-plated at the place to be tinned, and the nickel-plating height Hd is 8mm.

[0045] (3) hanging tin

[0046] Such as image 3 As shown, insert the part of the stainless steel pipe fitting 1 to be tinned into the glass vessel 2 (Hb=15mm, ФNb=Ф120mm, wall thickness 2mm) containing the active flux 3 for immersion, the immersion height Hy=7mm, and the immersion time 15s; The active flux 3 is liquid tin.

[0047] Such as Figure 4 and Figure 5 As shown, after taki...

example 2

[0054] Example 2: Hanging tin on stainless steel pipe fittings with Ф280mm inner diameter

[0055] (1) clean up

[0056] Stainless steel pipe fittings 1 outer diameter ФW=Ф281, inner diameter ФN=Ф280, wall thickness 0.5mm. Grind the place where the tin is to be hung with fine sandpaper, the grinding height Hq is 9mm, and it can be bright; clean the stainless steel pipe fitting 1 with gasoline first, then clean it with alcohol and dry it.

[0057] (2) Nickel plating

[0058] The stainless steel pipe fitting 1 is nickel-plated at the place to be tinned, and the nickel-plating height Hd is 8mm.

[0059] (3) hanging tin

[0060] Such as image 3 As shown, insert the part of the stainless steel pipe fitting 1 to be tinned into the glass vessel 2 (Hb=15mm, ФNb=Ф320mm, wall thickness 4mm) containing the active flux 3 for dipping, the dipping height Hy=7mm, and the dipping time is 15s; The active flux 3 is liquid tin.

[0061] Such as Figure 4 and Figure 5 As shown, as shown...

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Abstract

The invention belongs to the welding technology and particularly discloses a surface tin coating method applicable to a stainless steel pipe fitting. The method comprises the steps that the surface of the stainless steel pipe fitting is cleaned and then plated with nickel, then dipping, crucible tin coating and alkali liquor neutralizing treatment are carried out, and finally the stainless steel pipe fitting is cleaned and dried. Due to the fact that nickel plating treatment is carried out after cleaning is completed, then tin coating is carried out, stainless steel passes through a nickel layer and then makes contact with a tin coating layer, the surface tension is reduced, and the wetting and spreading capacity of molten tin on the surface of the stainless steel pipe fitting is improved, so that the continuous and uniform tin layer is obtained on the surface of the stainless steel pipe fitting, the pH value of the surface of the tin layer is controlled in a quantification mode through the alkali liquor cleaning process carried out after tin coating so that the pH value can range from 5 to 8, and the technological requirement of follow-up brazing is met.

Description

technical field [0001] The invention belongs to welding technology, in particular to a method for tinning the surface of pipe fittings before brazing stainless steel / aluminum alloy dissimilar metals. Background technique [0002] As a surface treatment process before brazing of stainless steel / aluminum alloy dissimilar metals, the surface tinning process of stainless steel has an important impact on the quality of stainless steel / aluminum alloy dissimilar metal brazing. [0003] Steel / aluminum welded structures have important applications in aerospace, transportation, national defense and other industrial sectors, but the connection between the two has always been a technical difficulty in the field of welding. For a long time, a lot of research work has been done in the field of steel / aluminum dissimilar metal connection, and the engineering application in non-sealed structures such as automobiles has been realized. [0004] In the existing method, the sealing member welde...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/20
CPCB23K1/20B23K2101/06B23K2103/20
Inventor 孔兆财江东马广超高凤林孙秀京陈志凯马丽翠范波郭振东
Owner CAPITAL AEROSPACE MACHINERY