I tried forge welding with Borax but it never worked, I tried. Then started new , new side draft forge new source of coal and clean Borax. So I found out the hard way, my Borax was always left outside got filled up with soot, dust, crap it looked awful now new box of Borax in a tin covered over till I need it. Good coal with the dust screened out prior to forge welding. Now dirty steel such as chainsaw blades,crane cable, timing chains all forge weld well. Even clean steel will weld without Borax in the new Forge In fact with gates and ornamental projects no flux is ever used. This stuff is cheap and it works well.