I'm not a blacksmith either but did build a forge years ago and tinkered some. Typically it is Borax and used as a flux when forge welding and driving holes like that. Keeps the scale down and allows the cooler punch to penetrate better. There are commercial grades of flux with other additives but each smith seems to have their own recipe or straight up Borax.
Glad you found interest in the video. His other's are Real Good also, imho!
PJ

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