I would suggest just around the corner, behind a wall, without eye
protection. Even a semi-safe distance would be so far away as to make
observation useless. Why would one want to risk optic damage when a lens is
so simple a solution?
Respectfully,
Ron Moore

"Les" wrote in message
oups.com...
Is there any rule of thumb on how close I can be and still safely watch
(not a casual glance) arc welding without any eye protection? Does
this distance vary by amperage or type (stick, wire, TIG, etc.)?

- les