My aching eyeballs after practicing FCAW.

Duggie said

I wondered about that. The flash lasts an instant before the lens darkens. It's supposed to darken in 1/250,000 of a second.

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Something wrong. I have a cheap one I bought at the local welding store, much like a Horrid Freight, and it works great. I have a very expensive one I bought "at a thrift store." Neither show a "flash" that I can detect at weld start.