If you verify acceptable transmittance of a welding shade for the wavelength of interest, I don't see any problem using the welders shade to do something like observe a dot as you try to focus. That being said, I have always thought that being able to see everything except for a potentially blinding laser beam lends itself to some possibly dangerous situations as well. While you might be able to find a transmittance plot for the particular shade you are considering, and could therefore probably determine if it will be acceptable for 445nm, you will still have the problem of being unable to see anything at all which could make for a dangerous situation. Since welding shades are primarily for blocking UV, they tend to have low transmittance at low wavelengths, but might be more transparent at visible wavelengths - but they are overall still very boadband (neutral density) compared to laser safety goggles. But you don't know how that breaks up spectrally.
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