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US 2017/0304962 A1Published application
Boric Acid Free Flux
AssigneeLincoln Global, Inc.
InventorRobert A. Howard
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Abstract
The invention described herein pertains generally to boric acid free flux composition in which boric acid and/or borax is substituted with a molar equivalent amount of potassium tetraborate tetrahydrate. In some embodiments, a phthalocyanine pigment is used to effect a color change at activation temperature.
Claims12
A boric acid free paste flux composition which comprises:
- water;
- potassium bifluoride (KHF2);
- fumed silica (SiO2);
- potassium tetraborate tetrahydrate (K2B4O7•4H2O);
- and
- potassium fluoroborate (KBF4).
3 more elements
Dependencies are inferred from the claim text.