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Brass flux-cored brazing filler metal with reducing agents and flow aids and preparation method thereof

A reducing agent and flow aid technology, applied in the direction of manufacturing tools, welding equipment, metal processing equipment, etc., can solve the problem of affecting the application of large-gap brazing of flux-cored filler metals, the filler metal cannot normally wet the welding base metal, and increase processing Difficulty and other issues, to achieve the effect of improving flow spreadability, facilitating popularization and application, and improving film removal ability

Inactive Publication Date: 2015-09-16
ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] At present, the existing seamed flux-cored brass welding wire made by rolling is prone to powder leakage (flux leaks out of the solder tube) during transportation and use, resulting in the solder not being able to wet the welding base metal normally.
Chinese patent 201110435173.2 discloses "Silver-based flux-cored welding wire and its manufacturing method", which records a method for manufacturing silver-copper-zinc seamless flux-cored welding wire using a seamless extrusion core filling production process, but the weight of a single extrusion billet in this method is Limited, the production efficiency has certain limitations, and there is also a hidden danger of flux breaking
In addition, when brazing components with large gaps, it is necessary to ensure that the solder has a certain filling amount, and when preparing the solder skin of the flux-cored solder, if the solder skin is too thick, it will increase the difficulty of processing, which will affect the size of the flux-cored solder. Applications of Gap Brazing

Method used

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  • Brass flux-cored brazing filler metal with reducing agents and flow aids and preparation method thereof
  • Brass flux-cored brazing filler metal with reducing agents and flow aids and preparation method thereof

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preparation example Construction

[0029] The preparation method of the brass flux-cored solder with reducing agent and flow aid of the present invention comprises the following steps:

[0030] The first step is to smelt brass-based solder ingots according to conventional methods;

[0031] In the second step, the ingot is processed into a thickness of 0.1 to 0.8mm and a width of 3.0~26.0m m ribbon-shaped brass-based solder;

[0032] In the third step, the strip-shaped brass-based solder is rotated to form a solder tube 2 with a spiral lap 1, and during the rolling process, the welding wire 3 and the flux core 4 are added to the solder tube;

[0033] The fourth step is to make the brass cored brazing wire and rod (which can be cut into 100-1000 mm brazing rods) by rolling or drawing the brazing material tube rolled in the third step. A brass flux-cored solder ring with a hollow structure or at least two turns of a brass flux-cored solder spiral ring wound in the axial direction made of long solder, the distanc...

Embodiment 1

[0036] A kind of self-reducing agent of the present invention, flow aid brass core solder, its preparation method is as follows:

[0037]a) Copper, zinc, tin, silicon, and manganese are prepared in proportion and smelted, cast into a rod-shaped BCu59.5Zn39Sn1Si0.3Mn0.2 solder alloy ingot of Φ50 mm, cut off the riser and turn the ingot to remove oxidation leather for use;

[0038] b) Raise the temperature of the solder extrusion equipment to 750 °C, place the turned ingot in the muffle furnace for preheating, the preheating temperature is 600 °C, put the preheated ingot into the mold of the extrusion equipment Inside, extrude into a strip-shaped solder with a thickness of 5.0 mm and a width of 8.5 mm, and make a brass-based solder strip with a thickness of 0.2 mm and a width of 7.5 mm;

[0039] c) Evenly mix the drug core containing 15% borax, 72% boric acid, 7% calcium fluoride, and 6% potassium fluoroaluminate, dry it in a low-vacuum drying oven at 100°C~130°C for 200min, an...

Embodiment 2

[0044] A kind of self-reducing agent of the present invention, flow aid brass core solder, its preparation method is as follows:

[0045] a) Copper, zinc, and manganese are prepared in proportion and smelted, cast into a rod-shaped Cu58Zn38Mn4 solder alloy ingot of Φ50 mm, cut off the riser, and then turn the ingot to remove the scale for use;

[0046] b) Raise the temperature of the solder extrusion equipment to 700 °C, place the turned ingot in the muffle furnace for preheating, the preheating temperature is 600 °C, put the preheated ingot into the mold of the extrusion equipment Inside, extrude into a strip-shaped solder with a thickness of 5.5 mm and a width of 8.8 mm, and make a brass-based solder strip with a thickness of 0.2 mm and a width of 8.0 mm;

[0047] c) Evenly mix the drug core containing 25% borax, 65% boric acid, 7% calcium fluoride, and 3% potassium fluoride, dry it in a low-vacuum drying oven at 100°C~130°C for 250min, and cool it for use;

[0048] d) The ...

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Abstract

The invention discloses brass flux-cored brazing filler metal with reducing agents and flow aids. The brass flux-cored brazing filler metal comprises a brazing filler metal pipe with a spiral lap seam, the brazing filler metal pipe is formed by rotatably rolling strip-shaped brass base brazing filler metal, and a welding wire and a flux core prepared from brass brazing flux, the reducing agents and the flow aids are wrapped by the brazing filler metal pipe. In the preparation process, the brass base brazing filler metal is molten according to a conventional method for ingot casting and is processed into strip-shaped brazing filler metal, then the brazing filler metal is rotatably rolled to the brazing filler metal pipe with the spiral lap seam, and in the rolling process, the welding wire and the flux core are added into the brazing filler metal pipe. A brass flux-cored brazing filler metal wire or bar or brazing filler metal ring are manufactured through rolling or drawing. The brass flux-cored brazing filler metal has the advantages that Sn, Ni, Si and other elements are added into the brazing filler metal in the form of the welding wire, when the content of alloy elements in the brass brazing filler metal is low, the excellent processing performance can still be kept, the brazing filler metal can achieve good wettability and fluidity, meanwhile, weld strength, low-temperature impact toughness and the anti-cracking ability are improved, and ductile-brittle transition temperature is lowered.

Description

technical field [0001] The invention relates to welding materials, in particular to a brass flux-cored solder with a reducing agent and a flow aid, and also relates to a preparation method of the brass flux-cored solder. Background technique [0002] The traditional brazing process is to use wire or strip brass solder paste or to pre-coat the flux on the workpiece with gas flux or before heating. The amount of brazing material cannot be guaranteed, and welding defects are prone to occur. What follows is rework, rework or even scrapping, resulting in waste of brass solder and raw materials, increasing manufacturing costs. In addition, the process of soldering flux or pre-fluxing adds a pre-soldering operation, increases the process and operation time, and adds a variable to the brazing process, which affects the consistency of the weld and the stability of the quality ; The activity of the gas flux is not enough, and the effect of removing the oxide film is poor. Due to th...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/14B23K35/30B23K35/363B23K35/368B23K35/40
CPCB23K35/0227B23K35/302B23K35/362B23K35/368B23K35/40
Inventor 龙伟民吕登峰沈元勋周许升于奇李涛刘洁薛行雁
Owner ZHENGZHOU RES INST OF MECHANICAL ENG CO LTD
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