Brazing ring and brazing system

Abstract

The invention relates to the technical field of welding ring manufacture, in particular to a brazing ring and a brazing system. The brazing ring comprises brazing filler metal. The brazing filler metal comprises an inner brazing filler metal layer and an outer brazing filler metal layer, wherein the inner brazing filler metal layer has a first melting point, the inner brazing filler metal layer iswrapped by the outer brazing filler metal layer, the outer brazing filler metal layer has a second melting point, and the second melting point is higher than the first melting point. According to theimplementation manner, the brazing ring is designed into the composite structure comprising the inner brazing filler metal layer and the outer brazing filler metal layer, in the later period of brazing, when the outer brazing filler metal layer is solidified, the inner brazing filler metal layer is still in the liquid state, pores and small gaps between welded pipes can be further filled, the flow time of the brazing filler metal is prolonged, and the brazing quality is improved.

Description

technical field [0001] The embodiment of the present invention relates to the technical field of welding ring manufacturing, in particular to a brazing ring and a brazing system. Background technique [0002] Aluminum tube-fin heat exchangers used in air conditioners contain a series of U-shaped tubes in the fins. Wherein, the U-shaped pipe is generally connected with the small elbow by brazing, and solder filling is required during the brazing process. In order to realize automatic welding, the solder filling in the prior art is generally to insert a welding ring on the small elbow, and use the welding ring to act as solder to fill the weld seam between the U-shaped pipe and the small elbow to realize automatic welding. Among them, due to the narrow brazing temperature range of aluminum tubes, in order to avoid burning the small elbow due to excessive flame temperature during the welding process, the flame is generally directly heated to the welding ring area. [0003] In...

AI Technical Summary

Problems solved by technology

[0004] The technical problem mainly solved by the embodiments of the present invention is to provide a brazing ring, which aims to solve the technical problem of insufficient filling of the weld between the existing U-shaped pipe and the small elbow.

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