Solar Flux Type B

Solar Flux Type B

Solar flux is a complex chemical compound, in the form of a powder finer than talcum powder. After welding it is important to seal and protect the back of the weld. Failure to treat the back of the weld will result in a porous, sugary weld that may lead to burn-through.

There are a variety of solar flux formulations available for welding different metals. Solar Flux Type B is specially formulated for welding stainless steel and alloy steels. When correctly mixed with alcohol (preferably methanol) and brushed on the back of the weld joint, Solar Flux forms a shield, protecting the weld from Oxygen. Dissipating the heat and unwanted oxides leaves you with an x-ray quality weld. It works to clean the metal, aiding of the flow of the filler metal over the base metal. By doing this, a protective barrier is formed that will prevent heat scale and re-oxidation.

It offers many benefits over the alternative sealing method of purging. Purging a weld usually requires an inert gas, such as argon. While this gives a similar finish solar flux is significantly easier and cheaper source. It is also faster and considerably easier to use.

Solar Flux

image of Solar back up Flux Tin



  • Type B for welding Stainless Steel and Alloy Steels Solar Flux
  • Type I for welding High Nickel Super Alloys
  • Type B conforms to the requirements of the US Military Specification MIL-F-7516B, Classes 2 and 4
  • Type I Conforms to the requirements of the US Military Specification MIL-F- 7516B, Classes 1, 2, 3 and 4

Solar Flux is ideal for use on pipe and tube welding, maintenance welding, in-field welding, one of a kind welds…and many, many more. If you would like any information regarding Solar Flux please get in touch.

Solar Flux application chart
Click below to read the independent Welding Design and Fabrication report.
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18 – 8 stainless steelstype B
Other stainless steelstype B
(except AISI 309, 309S, 310, 310S, 314)type B or I
Precipitation hardening stainless steelstype B
Chrome-moly steelstype B
All other alloy steels not mentioned above which contain less than 25% nickeltype B
High nickel super alloys containing over 25% nickel, eg. Monel, Inconel, and similar gradestype I


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