Reed-type environment-friendly coated silver brazing filler metal ring

Abstract

The invention discloses a reed-type environment-friendly coated silver brazing filler metal ring. The reed-type environment-friendly coated silver brazing filler metal ring is composed of at least two circles of reed-type silver brazing filler metal core and a silver brazing flux coating wrapped outside the reed-type silver brazing filler metal core, wherein the reed-type silver brazing filler metal core is formed by winding thin or thin and narrow silver brazing filler metal; the medium diameter of the reed-type silver brazing filler metal core ranges from 2.0 mm to 56.0 mm; silver brazing fluxes comprise at least one of inorganic fluoride, potassium fluotitanate, anhydride, borate and elemental boron; the silver brazing fluxes, the polyvinyl alcohol, the methylcellulose and water are prepared into a brazing flux solution according to a certain proportion, the outer surface of the reed-type silver brazing filler metal core is directly coated with the brazing flux solution, and the finished reed-type environment-friendly coated silver brazing filler metal ring can be obtained after the brazing flux solution is dried. Since the reed-type environment-friendly coated silver brazing filler metal ring does not contain organic bonding agents, the reed-type environment-friendly coated silver brazing filler metal ring meets the ROHS standard, pollution to environment during brazing and burning is greatly reduced, body health of operators is protected, and the labor intensity of the operators in the brazing process is greatly relieved.

Description

technical field [0001] The invention relates to welding materials, in particular to a spring-shaped environment-friendly coating silver solder ring suitable for brazing copper or steel thin-wall pipelines in various industries such as machinery, air conditioning and refrigeration. Background technique [0002] The traditional brazing process of air-conditioning and refrigerator pipelines is manual flame brazing with silk or strip-shaped silver solder. The heating time is longer when welding metals with fast heat conduction such as copper. When brazing, it is necessary to use wire or strip-shaped silver brazing material to coat the flux on the workpiece before heating or pre-heating. The amount of brazing material cannot be guaranteed, and problems such as welding leakage and welding blockage are prone to occur The rework, rework or even scrapping caused the waste of silver solder and raw materials and increased the manufacturing cost. In addition, the pre-soldering operati...

AI Technical Summary

Problems solved by technology

Chinese patent CN202804495 U discloses "a brazing material coated with a coating", which is to press-coat the coating onto a brazing rod, but this method can only produce brazing rods with a thick coating and cannot be used for production Non-strip or rod-shaped sheathed solder; Chinese patent CN101190479 A also discloses a kind of "red copper tungsten argon arc welding welding wire with flux sheath layer", which uses acrylic resin adhesive to bond the flux, and then the flux Pressure-coated onto the welding wire; the signed article "Development of Coated Brass Solder" also introduces a layer of coating on the surface of filamentary brass solder, and the coating is bonded together by organic adhesive

Since the above methods all use organic adhesives to press-coat the flux onto the welding wire, the burning during welding not only pollutes the environment, but also damages the health of the operator, which is not environmentally friendly.

Images