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Why Should You Use Solar Flux


When welding stainless steel (or one of the high nickel alloys) – Inconel, Monel, etc.), the shielding gas or the flux in the electrode only protects the FRONT of the weld. You must use something on the BACK of the weld to keep the oxygen out, float out the oxides and dissipate the heat. This can be accomplished either by purging with an inert gas, usually argon, or by the use of SOLAR FLUX. Failure to protect the back of the weld by one method or the other will result in a sugary, porous weld, and burn–through; and the weld will not be of x-ray quality.

front of weld

Isn't the weld pictured above beautiful? From the front it looks perfect, doesn't it? But, when you turn it over.........

Back of Weld becomes very evident that proper backing, either purging or SOLAR FLUX, is needed if you hope to get a good weld. In the above text coupon, the left half of the joint was protected with SOLAR FLUX while the right half was left unprotected. A similar result would have been obtained if an argon purge had been used.


SOLAR FLUX has been protecting the back of the weld, keeping the oxygen off, dissipating heat and unwanted oxides, and producing x-ray quality welds for over 50 years. It is often preferred over inert gas purging because it is easier, faster, simpler, and less expensive to use, yet yields the same x-ray quality weld.