Cored copper welding wire suitable for small area brazing

A brazing wire and cored technology, applied in the direction of welding medium, welding equipment, welding/cutting medium/material, etc., can solve problems such as unsuitable for high-efficiency brazing, and achieve convenient and reliable welder operation, high brazing efficiency, and easy absorption hot effect

Active Publication Date: 2015-06-10
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The flux or metal powder in the above-mentioned flux-cored wires is used to improve the composition, structure and performance of the solder powder. It mainly plays the role of solid solution strengthening and dispersion strengthening, and is used to improve the mechanical properties of the joint. It is not suitable for high-efficiency brazing in fine areas. weld

Method used

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  • Cored copper welding wire suitable for small area brazing
  • Cored copper welding wire suitable for small area brazing
  • Cored copper welding wire suitable for small area brazing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As shown, the diameter of the seamless welding wire is 2.0mm, which is divided into the outer layer homogeneous alloy solder 1 and the inner core solder 2 structurally, the inner core diameter is 1.0mm, and the weight ratio of the outer layer homogeneous alloy solder is 88%. The weight ratio of the inner core flux is 12%. The composition of the outer homogeneous alloy solder is 59% Cu, 38% Zn, 1.5% Sn, 0.8% Mn, 0.5% Ni and 0.2% Si; the inner core composition is 70% B 2 o 3 , 21% Na 2 O·2B2 o 3 , 4% CsF and 5% NaF. The butt weld of aluminum bronze rod (QAl9-4) with a diameter of 3mm is used for flame brazing, which can be directly brazed to form, without turbulent flow of brazing material, full brazing seam shape, reliable quality, and the tensile strength of the connection can reach 290MPa.

Embodiment 2

[0035] Such as figure 2 As shown, the diameter of the seam welding wire is 1.6mm, and it is divided into the outer layer homogeneous alloy solder 1 and the inner core solder 2 structurally. The inner core diameter is 0.9mm, and the weight ratio of the outer layer homogeneous alloy solder is 85%. The weight ratio of the inner core flux is 15%. The composition of the outer homogeneous alloy solder is 57% Cu, 39% Zn, 2.0% Sn, 1.2% Mn and 0.8% Ni; the inner core composition is 65% B 2 o 3 , 26% Na 2 O·2B 2 o 3 , 1% CsF and 8% NaF. The butt weld of alloy steel rods (40Cr) with a diameter of 2mm is used for flame brazing, which can be directly brazed into shape, without turbulent flow of brazing filler metal, full brazing seam shape, reliable quality, and the connection tensile strength can reach 320MPa.

Embodiment 3

[0037] Such as image 3 As shown, the diameter of the seam welding wire is 1.5mm, which is divided into the outer layer homogeneous alloy solder 1 and the inner core solder 2 structurally, the inner core diameter is 0.9mm, and the weight ratio of the outer layer homogeneous alloy solder is 90%. The weight ratio of the inner core flux is 10%. The composition of the outer homogeneous alloy solder is 61% Cu, 37% Zn, 1.0% Sn, 0.2% Mn, 0.7% Ni and 0.1% Si; the inner core composition is 68% B 2 o 3 , 24% Na 2 O·2B 2 o 3 , 1% CsF and 7% NaF. The butt weld of alloy steel rods (45) with a diameter of 2mm is used for flame brazing, which can be directly brazed to form, without turbulent flow of brazing material, full brazing seam shape, reliable quality, and the connection tensile strength can reach 300MPa.

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Abstract

The invention discloses a cored copper welding wire suitable for small area brazing, and belongs to the field of flame brazing or induction brazing of steel structures and copper pipes. The cored copper welding wire consists of an inner core brazing flux and a homogeneous alloy brazing material coating the inner core, wherein the inner core brazing flux is a mixture of boron-containing compounds and fluoride. By virtue of characteristics of high rigidity and good stiffness of a tubular material, operability of the welding wire is improved; by virtue of a characteristic of quick heat absorption of a material with a large specific surface area, the melting speed of the brazing material is increased; by virtue of a characteristic of integration of the brazing flux and the brazing material, the operating process is simplified and the brazing construction efficiency is improved; by virtue of a characteristic of less material per unit length of a hollow material, accumulation of the brazing material is reduced and the brazing material is saved; by virtue of a characteristic of attachment of the brazing flux, the flowability of the brazing material is improved, so that phenomena of loss and waste of the brazing material are reduced and the quality of a brazing joint of a small area brazing seam is ensured.

Description

technical field [0001] The invention relates to a welding wire used in the field of flame brazing or induction brazing of steel structures and copper pipes, in particular to a cored copper welding wire suitable for brazing in fine areas. Background technique [0002] Copper wire has its unique requirements when used as a brazing material. Good fluidity and comprehensive mechanical properties are the basic requirements. Equipment and other industries are essential and vital connecting materials, and brazing technology plays an important role in these industries. For fine joints, there is a problem that it is not easy to braze, mainly because the melting temperature of copper wire is high, and it is not convenient to add brazing material. In order to pursue brazing process and technical economy, brazing workers are constantly developing new low-silver solder and medium-silver solder to replace copper wire. The main purpose is to improve the fluidity and wettability of solder....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K35/30B23K35/40
CPCB23K35/0227B23K35/302B23K35/3602B23K35/362
Inventor 龙飞胡庆贤张子雄苏雷徐华苏莉
Owner HARBIN INST OF TECH
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