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A brazing process suitable for dissimilar metals of steel and aluminum and its brazing connector

A dissimilar metal and brazing technology, which is applied in metal processing equipment, manufacturing tools, welding equipment, etc., can solve the problems of product use range and performance limitations, and achieve the goal of controlling adverse effects, ensuring welding quality, and promoting wetting and spreading Effect

Active Publication Date: 2017-04-26
CAPITAL AEROSPACE MACHINERY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In terms of steel / aluminum dissimilar metal sealing structure welding, some domestic scholars have realized engineering applications by using the soft brazing method, but no research results have been found in the hard brazing aspect, which limits the use range and performance of the formed products to a certain extent.

Method used

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  • A brazing process suitable for dissimilar metals of steel and aluminum and its brazing connector
  • A brazing process suitable for dissimilar metals of steel and aluminum and its brazing connector
  • A brazing process suitable for dissimilar metals of steel and aluminum and its brazing connector

Examples

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Effect test

example 1

[0030] Example 1: Ф47mm inner diameter specification 1Cr18Ni9Ti / 6A02 conduit structure brazing

[0031] 1) Remove oil and oxide film by conventional aluminum alloy surface cleaning methods for aluminum rings, process cores and solder;

[0032] 2) The surface of stainless steel needs to be nickel-plated, and the thickness of the coating is 20 μm;

[0033] 3) Raise the crucible furnace to the set furnace temperature in advance before brazing, and set the furnace temperature to 660°C;

[0034] 4) Put the process core into the aluminum ring;

[0035] 5) Rivet the bottom of the combined semi-finished product of the process core and the aluminum ring to achieve bottom sealing;

[0036] 6) Press the steel ring into the annular gap formed by the process core and the aluminum ring, and measure the height difference between the upper surface of the process core and the upper surface of the inner ring platform of the steel ring at four symmetrical points to ensure that the height diffe...

example 2

[0042] Example 2: Ф220mm inner diameter specification 1Cr18Ni9Ti / 6A02 conduit structure brazing

[0043] 1) Remove oil and oxide film by conventional aluminum alloy surface cleaning methods for aluminum rings, process cores and solder;

[0044] 2) Nickel plating is required on the surface of stainless steel, with a thickness of 30 μm;

[0045] 3) Raise the crucible furnace to the set furnace temperature in advance before brazing, and set the furnace temperature to 720°C;

[0046] 4) Put the process core into the aluminum ring;

[0047] 5) Rivet the bottom of the combined semi-finished product of the process core and the aluminum ring to achieve bottom sealing;

[0048] 6) Press the steel ring into the annular gap formed by the process core and the aluminum ring, and measure the height difference between the upper surface of the process core and the upper surface of the inner ring platform of the steel ring at four symmetrical points to ensure that the height difference after...

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Abstract

The invention belongs to the welding technology and particularly discloses a brazing technology applicable to steel-aluminum dissimilar metal and a brazing communicating device thereof. The technology comprises the steps that an aluminum piece is cleaned; the surface of a stainless steel piece is plated with nickel, and the bottom of a combined semi-finished product of a technological core and an aluminum ring is sealed; a steel ring is pressed into an annular gap formed by the technological core and the aluminum ring, and then brazing filler metal and brazing flux are added into a crucible furnace to conduct brazing. The technological core structure is used, the steel ring and the aluminum ring are assembled through the technological core to form the structure similar to the communicating device, and therefore brazing of the steel / aluminum dissimilar metal is achieved; due to the fact that an exhaust and slagging hole is designed in the technological core, gas and welding slags generated in the welding process can be effectively eliminated, and the welding quality is ensured; the surface alkali washing treatment and the stainless steel surface nickel plating treatment are used as the surface treatment procedures, so that the adverse effect of a part surface oxidation film on the welding process is effectively controlled.

Description

technical field [0001] The invention belongs to welding technology, and in particular relates to a brazing process and device for dissimilar metal brazing. Background technique [0002] Steel / aluminum anisotropic 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. Fe and Al can form solid solutions, intermetallic compounds, and eutectics. The solubility of Fe in solid aluminum is extremely small, and Fe is almost insoluble in aluminum at room temperature. Aluminum alloys containing trace amounts of Fe will produce intermetallic compounds FeA1 during cooling 3 , with the increase of steel content, Fe will appear successively 2 A1 5 、FeAl 2 , Fe 2 al 7 And brittle phases such as FeAl. The hardness of the Fe-Al intermetallic compound is about 600-1100HV, which leads to the brittleness of the bonding zone...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K1/008B23K1/19B23K1/20B23K3/08
CPCB23K1/008B23K1/19B23K1/20B23K3/08
Inventor 马广超孔兆财陈志凯马丽翠范波张巍巍宁建民郭世雄
Owner CAPITAL AEROSPACE MACHINERY
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