| 主权项 |
1. Welding wire for use in arc welding comprising a welding wire substrate having surfaces and a coating on the surfaces of the welding wire substrate, the coating comprising (a) 0.001 to 10 gms/m2 of welding wire surface area of electrically conductive thermally stable solid particles, and (b 60 to 98 wt. % of the coating of an oil or wax organic binder, wherein the electrically conductive thermally stable solid particles
(i) have an average particle size of ahem 40 microns or less, (ii) remain solid and do not melt at a temperature of 1200° C., (iii) are unreactive in air at 1200° C. as determined by Thermal Gravimetric Analysis according to ASTM E2550-07, (iv) exhibit an electrical conductivity of at least about 10 S/cm at 800° C., and (v) comprise a perovskite corresponding to the formula ABOx, wherein either (A) A is at least one element selected from rare earth, alkaline earth, alkali, Pb+2 and Bi+3, and B is at least one element selected from Li+, Cu+2, Mg+2, Ti+3, V+3, Cr+3, Mn+3, Fe+3, Co+3, Ni+3, Rh+3, Ti+4, Mn+4, Ru+4, pt+4, Nb+5, Ta+5, Mo÷6 and W+6, or (B) A is at least one of La, Ce, Pr, Sm, Nd, Gd and Y, B is at least one of Ga, Mg, Mn, Fe, Cr, Co, Cu, Zn and Ni, and x is 2.5-3.2, and wherein A is optionally partially substituted with one or more of Sr, Ba and Ca. |
