Welding flux I have come to realize there are many types of fluxes that blacksmith’s have used in forge welding over the years. Although, much information easily found on the inter-web list borax as a flux; it is more suited as an ingredient to a flux formula. After reading different blacksmiths accounts of what makes a good welding flux in “Practical Blacksmithing” by author M.T. Richardson, there seems to be a variety of flux formulas to match each blacksmith’s welding style. From metal filings, white sand, salt petre and pulverized glass including heating and cooling of formulas to get the flux just right. I couldn’t help but wonder if there’s a new combination to what could be used to make a successful weld. With that being said I’ll start with the most basic formula and try a few experiments myself. Wouldn’t it be interesting if there was new flux formula someone created today that hasn’t already been tried. If I come up with something new I might just name it “Magic Weld”.
I’ll post the formulas old and new and share any pros and cons as I go. Easier formulas first. Source of Formulas are found on pages 102 - 105 of "Practical Blacksmithing" By M.T. Richardson The formulas below include ingredients and basic directions. I did not use the complete text. You can find the book for free on Google books if you care to read in original context. No. 6. One part lime Two to Three parts river sand By R. No. 7. One part copperas (iron sulfate) Two parts salt Four parts sand Mix together well By A. G. C. No. 8. One once of carbonate of iron (iron carbonate, FeCO3) see how to video below One pound of borax Mix together By G. W. P. No. 3. Two ounces of copperas Four ounces of salt Four pounds of white sand Mix together The next flux formulas require more than just mixing ingredients. No. 1. Ten ounce of borax One ounce of muriate of ammonia (sal ammoniac) Heat until spume disappears then let cool; pulverize and store in dry place By J. C. McM No. 4. One part borax One part pulverized glass Wet with alcohol then heated to a cherry red in a crucible. Pulverize when cool If you have tried these fluxes or any similar formulas with success or failure please share with others. VIDEO
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