PICKLING PREPARATIONS FOR METALSURFACES; FLUXES AND OTHERAUXILIARY PREPARATIONS FORSOLDERING, BRAZING ORWELDING;SOLDERING, BRAZING ORWELDING POWDERS AND PASTESCONSISTING OF METAL AND OTHER MATERIALS; PREPARATIONS OF AKIND USED AS CORES OR COATINGS FOR WELDING ELECTRODES OR RODS.
HS codes falls under this category.