How often do professional welders replace their lenses?

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As needed!!

Depends on Arc Time and what process .

Some jobs it was every morning during the morning meeting .

 

When I think about it, maybe once a year, maybe every couple years

 

https://www.tacomaworld.com/threads/anything-welding.113957/

 

Then it is not like you have 4 hours plus Arc time every day.

 

It varies by process. When I TIG I prefer as clean of a lense protector as possible. I've had them last about a year and when they get scratched and pitted up, I relegate them to MIG work. This allows me to greatly increase the length of time my pretty TIG lense protectors last.