Brazing material outer coat and preparation method thereof, in-situ synthetic metal-coated flux-cored silver brazing material, preparation method thereof, welding method and joint body
US10987747B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2017 |
| Grant date | Apr 27, 2021 |
| Priority date | — |
| Expiry date | Nov 11, 2038 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB23K2103/12
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A brazing material outer coat and a method for preparing the same, an in-situ synthetic metal-coated flux-cored silver brazing material and a method for preparing the same, a welding method and a joint body, wherein the in-situ synthetic metal-coated flux-cored silver brazing material comprises a flux core and a brazing material outer coat wrapping the flux core, the brazing material outer coat comprises, in percentage by weight: silver Ag 20.0˜36.0%, copper Cu 35.0˜45.0%, zinc Zn 27.0˜37.0%, tin Sn 1.0˜3.0%, phosphorus P 0.1%˜0.5%, nickel Ni 0.5˜2.0%, germanium Ge 0.1˜0.3%, and lithium Li 0.1˜0.3%, the flux core comprises, in percentage by weight: elemental boron micropowder 5.0˜10.0%, sodium borohydride 5.0˜10.0%, potassium fluoroborate 15.0˜30.0%, boric anhydride 25.0˜40.0%, sodium fluoride 10.0˜30.0%, sodium bifluoride 2.0˜4.0%, and copper sulfate 1.0˜5.0%. The in-situ synthetic metal-coated flux-cored silver brazing material in the present disclosure realizes self-reaction in a brazing process to coat a layer of copper film on a surface of a brazed metal, the core of the brazing material has good wettability, good flowability, self-brazing function, and zinc being hard to vola…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.