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Iron-based brazing filler metal and welding method using iron-based brazing filler metal

A welding method and brazing filler metal technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve the problems of reducing the strength of brazing joints, internal or external leakage of heat exchangers, and lower melting points of plate base materials and other issues to achieve the effect of ensuring uniformity, avoiding burn-through, and good toughness

Inactive Publication Date: 2020-01-17
江苏远卓设备制造有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Boron and silicon will quickly migrate and diffuse into the plate base material of the heat exchanger during high-temperature brazing, resulting in a decrease in the melting point of the plate base material, and the thickness of the plate base material is generally only 0.3mm-0.5mm. It will dissolve and burn through during the brazing process, resulting in internal or external leakage of the heat exchanger
Boron and silicon will also form a large amount of brittle chromium boride and nickel silicide at the brazing joint, reducing the strength of the brazing joint

Method used

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  • Iron-based brazing filler metal and welding method using iron-based brazing filler metal
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  • Iron-based brazing filler metal and welding method using iron-based brazing filler metal

Examples

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Effect test

Embodiment 1

[0037] An iron-based solder, the chemical composition and weight percentage of the solder are: Ni: 17%-19%, Cr: 28%-30%, P: 5.5%-6.5%, Si: 6%-7%, Nb: 0.2%-1%, the balance is Fe. The iron-based solder does not contain boron and contains a small amount of silicon, which can reduce the melting point of the substrate caused by the diffusion of boron and silicon to the substrate to be welded and the problems of burning through the substrate, and The iron-based brazing filler metal contains a small amount of niobium, which can enhance the mechanical properties of the brazing filler metal, make the brazing joint have good toughness and high strength, and improve the oxidation resistance and performance of the brazing joint through an appropriate amount of nickel and chromium elements. Corrosion resistance, so that the plate heat exchanger produced with this iron-based brazing filler metal can reach the plate heat exchanger welded with nickel-based brazing filler metal in terms of cor...

Embodiment 2

[0064] A spraying device for spraying iron-based solder onto parts, including a frame 1, the frame 1 has a workbench, the rear side and the top surface of the two sides of the workbench are provided with protective enclosures, and only the front is left as an operator on the workbench For front operation, the workbench is divided into working station and waiting station, and the working station is located behind the waiting station. The workbench is provided with a horizontal rotating support 4, and two ends of the horizontal rotating support 4 are symmetrically provided with two loading trays 5, and the horizontal rotating bracket 4 is periodically rotated by 180° driven by a motor, so that the two loading trays 5 alternately rotate in the working position. Switch between waiting position and waiting position. The loading tray 5 is used to load parts, such as heat exchange fins, and a fixed structure can be set on the loading tray 5 according to actual needs (generally design...

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Abstract

The invention discloses an iron-based brazing filler metal and a welding method of the iron-based brazing filler metal, and belongs to the field of welding materials. The problems that existing iron-based brazing filler metal is too high in boron and silicon, during welding, the boron and the silicon can be diffused to a part base material required to be welded, and the melting point of the base material becomes low can be solved. The iron-based brazing filler metal comprises, by weight percent, 17 to 19% of Ni, 28 to 30% of Cr, 5.5 to 6.5% of P, 6 to 7% of Si, 0.2 to 1% of Nb and the balanceFe. The iron-based brazing filler metal is low in melting point, the influence on the melting point of the part base material required to be welded during welding of the iron-based brazing filler metal can be reduced, the part base material is prevented from being burnt through during welding, and a welding joint using the iron-based brazing filler metal for welding is oxidation-resistant, resistant to corrosion, high in strength and good in toughness.

Description

technical field [0001] The invention relates to welding materials, in particular to an iron-based solder and a welding method using the iron-based solder. Background technique [0002] Brazing is to use the metal material whose liquidus temperature is lower than the solidus temperature of the base metal to be welded as the solder, heat the solder and the base metal at the same time until the solder melts, use the liquid solder to wet the base metal, and It is filled to the gaps and joints of the base metal, and as the liquid solder crystallizes and solidifies, the connection and sealing of the base metal is realized. [0003] At present, the commonly used solders for brazed plate heat exchangers include copper-based solders, nickel-based solders and iron-based solders. Copper-based solder has good plasticity, convenient processing and assembly, good wettability and fluidity during brazing, and high brazing yield. However, in some working conditions, copper-based brazed pla...

Claims

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Application Information

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IPC IPC(8): B23K35/30B23K1/008B23K3/06B23K3/08
CPCB23K1/008B23K3/0638B23K3/08B23K35/3086
Inventor 缪君明周浩军陈佳
Owner 江苏远卓设备制造有限公司