Cored copper welding wire suitable for small area brazing

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....

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