For me the secret to forge welding is in the flux. I know some smiths weld without flux but I never could. Ike Doss taught me to weld 30 years ago using a flux he used from The Cortland Welding Compound Co. He gave me about 5 lbs of it which I have used up and had to go to Borax, which works but not as well (for me). I found an original 1 lb box on eBay a couple of years ago but now I'm running low again.
While researching Cortland's compound, I think I've found one similar so when I run out I will be ordering Climax Welding Compound from Centuar Forge.
Anyone have experience with it?
http://www.centaurforge.com/Climax-Welding-Compound-5-lb-can/productinfo/5CLIMAX/