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There are metal deposition (spray) processes which can leave the appearance of brimstone, local to the area of affect.

Depending on the parent materials, the end result can give a very very tough and hard surface that can be machined/ground/finished.





Cheers
Tinker

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Are you refering to the powder spraygun that uses a oxy/acetylene flame.
In the industry its often applied on moving parts that needs a bit of buildup after wear, it could explain the surface. I would be damn more easy to just use a hammer to bend the bites and lug up a bit then using a torch.

But there are some really stupid beople out there so who knows