Preparation method of flux coated silver solder ring

Abstract

The invention relates to a preparation method of a flux coated silver solder ring. The method comprises the steps of 1, preparing the following raw materials: 10-50% of Ag, 15-45% of Cu, 17-40% of Zn,1-3% of Sn, 0.1-0.5% of P, 0.5-2% of Ni, 0.1-0.3% of Ge, and 0.1-0.3% of Li; adding the raw materials to an intermediate-frequency smelting furnace crucible; performing smelting, casting, extruding and drawing to obtain silver solder wires; and preparing multi-coil spring shaped silver solder ring through the silver solder wires; 2, preparing 1-5% of boron micro powder, 5-10% of sodium borohydride, 15-30% of potassium fluoborate, 25-40% of boric anhydride, 10-30% of sodium fluoride, 2-5% of potassium bifluoride, 1-5% of copper sulfate, 0.1-2% of polystyrene, and 0.2-2% of dibutyl phthalate; mixing the materials; adding 45% of ethyl acetate; and uniformly stirring to obtain a flux coating solution for later use; and 3, spraying the flux coating solution to cover the outer parts of the spring shaped silver solder ring; and drying to obtain the flux coated silver solder ring. The flux coated silver solder ring prepared by the method is high in wettability, high in flowability, and capable of self-fluxing; zinc is hard to volatilize; and moreover, the flux coating is high in activity, low in moisture absorption capacity, few in carbon residues, high in ductility and toughness, and isparticularly applicable to soldering of pipeline assemblies such as a stainless steel pipeline assembly and a manganese brass pipeline assembly.

Description

technical field

[0001] The invention relates to the technical field of welding materials, in particular to a method for preparing a coated silver solder ring. Background technique

[0002] At present, only flux-cored solder rings and self-contained flux-type solder rings are used in pipeline brazing. Since the processing performance of flux-cored solder is restricted by its composition, many component drugs The core solder has the defect of poor deep processing performance, which can only be prepared into strips, and it is difficult to prepare into a ring (the preparation method of the core solder is: the solder is rolled into a strip shape, and then the solder strip is rolled into a U-shaped groove, and the solder is added Finally, through multi-pass rolling joints to form O-shaped tubular structure flux core solder, and then draw and reduce the diameter to prepare flux core solder), the most promising application prospects for pipeline brazing in air conditioners, refriger...

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