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Brazing filler metal for brazing of stainless steel and preparation method thereof

A stainless steel and brazing material technology, applied in welding equipment, welding/cutting medium/material, welding medium, etc., can solve the problems of increased brazing cost and great influence of base metal, and achieve good wettability and caulking ability , high strength, low melting point effect

Active Publication Date: 2015-05-27
SHANGHAI UNIV OF ENG SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chinese patent CN101450428B discloses a Fe-Si-Ni nickel-based solder for stainless steel brazing. The solder does not contain B elements, and the brazing quality is better, but the melting point of the solder is still high, reaching 1158 ° C, so , higher brazing process parameters are required for brazing. However, higher process parameters not only increase the cost of brazing, but also have a greater impact on the base metal during the brazing process. Improvement, obtain a new low melting point solder

Method used

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  • Brazing filler metal for brazing of stainless steel and preparation method thereof
  • Brazing filler metal for brazing of stainless steel and preparation method thereof
  • Brazing filler metal for brazing of stainless steel and preparation method thereof

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Embodiment 1

[0021] Weigh 40g of nickel block, 35g of iron block, 10g of silicon block and 15g of manganese block respectively, put them into the arc melting furnace, vacuumize the arc melting furnace, fill in argon, ignite the arc, and make the brazing material Melt and smelt repeatedly 5 times to get a button-shaped solder alloy ingot. The composition of the alloy ingot is: Ni40Fe35Si10Mn15; put the alloy ingot into a vacuum strip machine to get a foil-shaped amorphous Ni- Fe-Si-Mn solder, the thickness of the foil is about 40μm.

[0022] Put the prepared solder into the DSC differential thermal analyzer to analyze the melting point, the results are as follows: figure 1 Shown: The endothermic peak begins to appear when the temperature reaches 1059.9°C, stops at 1073.1°C, and reaches the peak at 1069.1°C, so it can be known that its melting point is 1069.1°C.

[0023] 316L stainless steel was used as the test base material, and the material was processed into four wetted parts with a len...

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Abstract

The invention discloses brazing filler metal for brazing of stainless steel and a preparation method of the brazing filler metal. The brazing filler metal comprises, by weight, 33-37% of Fe, 8-12% of Si, 10-25% of Mn and the balance Ni. The preparation method comprises the steps that the components are weighed according to the formula, then the components are placed into a vacuum arc furnace, vacuum pumping is conducted, and argon is fed into the vacuum arc furnace to conduct uniform smelting. Compared with the prior art, the brazing filler metal has the advantages that the melting point is low, wettability and jointing performance are good, and joint strength of the stainless steel brazed with the brazing filler metal is high.

Description

technical field [0001] The invention relates to a novel solder for brazing stainless steel, in particular to a Ni-Fe-Si-Mn quaternary brazing filler metal that does not contain B elements and has a low melting point, and belongs to the technical field of brazing. Background technique [0002] Stainless steel has good corrosion resistance, oxidation resistance and high temperature mechanical properties and is widely used in aerospace, electronic communications, machinery, energy, transportation, instrumentation and other fields, such as honeycomb structure, rocket engine combustion chamber, heat exchanger. Stainless steel can be welded and brazed. However, considering the actual and working conditions of the joints, brazing is generally used. Brazing is to use a filler material with a lower melting point than the base metal as the solder, heat the connecting piece and the solder to a temperature higher than the melting point of the solder and lower than the melting point of t...

Claims

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Application Information

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IPC IPC(8): B23K35/24B23K35/40
CPCB23K35/3033B23K35/3053B23K35/40
Inventor 秦优琼孙磊于治水
Owner SHANGHAI UNIV OF ENG SCI