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Vacuum brazing method for stainless heat-resistant steel pipe parts

A brazing method and steel pipe technology, applied in welding equipment, metal processing equipment, manufacturing tools, etc., can solve problems such as inability to effectively suppress brazing filler metal overflow, pile height, base material grain growth, and long heat preservation time , to achieve the effect of not easy to grow the base metal grain, high strength, and reduce labor intensity

Active Publication Date: 2021-03-09
AECC AVIATION POWER CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a vacuum brazing method for sub-class parts of stainless steel heat-resistant steel pipes, which solves the problem that the existing choke agent cannot effectively inhibit the spread of copper-based solder, which leads to solder overflow and pile height, and the use of The problem of the growth of base metal grains due to the long holding time of copper-based solder in vacuum brazing

Method used

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  • Vacuum brazing method for stainless heat-resistant steel pipe parts
  • Vacuum brazing method for stainless heat-resistant steel pipe parts
  • Vacuum brazing method for stainless heat-resistant steel pipe parts

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] This embodiment adopts the stainless steel heat-resistant steel pipe subclass parts that adopts filamentary HBCuA solder vacuum brazing to be made up of 0Cr18Ni9 pipe 2 and 4Cr14Ni14W2Mo ball head 1, as figure 2 As shown, it specifically includes the following steps:

[0038] (1) Preprocessing:

[0039] Step 1, positioning welding: Use argon arc welding to uniformly position 1 to 2 points in the circumferential direction to position the pipe 2 on the ball head 1, and then use clamping to ensure that the brazing gap between the pipe 2 and the ball head 1 meets 0.03 mm ~ 0.1mm.

[0040] Step 2, Grinding: Use a wire wheel or wire brush to polish the oxidation film of the argon arc welding positioning solder joint, and use sandpaper or a scouring pad to polish the surface of the part until a fresh metallic luster is exposed.

[0041] Step 3, Cleaning: Use a clean silk cloth dipped in clean acetone to scrub the parts to be welded until there are no more stains on the silk...

Embodiment 2

[0052] The difference from Example 1 is that the Al 2 o 3 Micropowder and water-based adhesive were added into the beaker according to the volume ratio of 1.5:1, and then the water-based adhesive was poured into Al 2 o 3 In the micropowder, stir repeatedly (1-3) minutes until uniform, and then a white choke agent A can be prepared.

[0053] It has been verified that the grain size of the base metal detected after vacuum brazing is (3-2). Therefore, the crystal grains of the base material in this embodiment are improved, which is beneficial to ensure the comprehensive mechanical properties of the base material.

Embodiment 3

[0055] The present embodiment adopts the vacuum brazing of filamentary HBCuA solder to be made up of the stainless heat-resistant steel pipe subclass parts of 0Cr18Ni9 pipe 2 and 4Cr14Ni14W2Mo ball head 1, and it specifically comprises the following steps:

[0056] (1) Preprocessing:

[0057] Step 1, positioning welding: Use argon arc welding to uniformly position 1 to 2 points in the circumferential direction to position the pipe 2 on the ball head 1, and then use clamping to ensure that the brazing gap between the pipe 2 and the ball head 1 meets 0.03 mm ~ 0.1mm.

[0058] Step 2, Grinding: Use a wire wheel or wire brush to polish the oxidation film of the argon arc welding positioning solder joint, and use sandpaper or a scouring pad to polish the surface of the part until a fresh metallic luster is exposed.

[0059] Step 3, Cleaning: Use a clean silk cloth dipped in clean acetone to scrub the parts to be welded until there are no more stains on the silk cloth.

[0060] (2...

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Abstract

The invention relates to the technical field of vacuum brazing, and particularly discloses a vacuum brazing method for stainless heat-resistant steel pipe parts. The vacuum brazing method for the stainless heat-resistant steel pipe parts comprises the following steps of when copper-based brazing filler metal is adopted, smearing a flow blocking agent A and a flow blocking agent B after the presetting of the brazing filler metal is completed, starting to heat after smearing is finished, and performing vacuum brazing on the parts after heating is finished, wherein the flow blocking agent A is awhite flow blocking agent prepared from Al2O3 micro powder and a water-based adhesive, and the flow blocking agent B is a pink flow blocking agent prepared from a red flow blocking agent with the trademark of NICROBRAZ and a green flow blocking agent with the trademark of NICROBRAZ; when gold-based brazing filler metal is adopted, after the presetting of the brazing filler metal is completed, thetemperature is increased to 900 DEG C at the heating rate of (570 to 630) DEG C / h, and conducting heat preservation for (15 to 20) min; and increasing the temperature to 1010 DEG C at the heating rateof (390 to 510) DEG C / h, conducting heat preservation for (10 to 15) min, and performing vacuum brazing on the parts. The problems that according to an existing flow blocking agent preparing and smearing scheme, spreading of the copper-based brazing filler metal cannot be effectively restrained so as to cause the phenomena that the brazing filler metal overflows and is piled up, and when the copper-based brazing filler metal is adopted for vacuum brazing, the heat preservation time is too long, and parent metal grains grow up are solved.

Description

technical field [0001] The invention relates to the technical field of vacuum brazing, and specifically discloses a vacuum brazing method for sub-category parts of stainless heat-resistant steel pipes. Background technique [0002] The aero engine is the most important weapon of the country and is known as the "Pearl in the Crown of Industry". Vacuum brazing technology is widely used in the field of aero-engine manufacturing, and has the characteristics of high production efficiency and small thermal deformation. In the prior art, copper-based solder represented by HBCuA solder is often used to weld stainless heat-resistant steel pipe sub-categories. On the one hand, copper-based solders are corrosion-resistant, have good wettability, and have low cost of use. However, most copper-based solders need to be welded to parts at a brazing temperature above 1100°C, and the holding time at this temperature is too long. If it is long, it will cause the grain growth of the base met...

Claims

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Application Information

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IPC IPC(8): B23K1/008B23K1/20
CPCB23K1/008B23K1/20B23K1/206
Inventor 王祥贺振宇张军呼新岗杨红茹王晨张建伟王健
Owner AECC AVIATION POWER CO LTD