Phosphorus copper electrode welding copper pipe without flux, but the effect of flux will be better, simple use of flux, generally borax.Copper pipe and copper pipe fittings are not welded with flux, copper pipe and brass welding to use flux.

Phosphorus is a reducing agent, can reduce cuprous oxide, phosphorous oxide floating on the surface of the weld, phosphorous copper electrode fluidity is good, with self-brazing effect.Flux shall be used for other silver and copper electrodes.