8 hour shift
subtract 15 minutes for 1 break,
then we have to subtract time for bathroom breaks,
then we subtract for drink and fluid time, ie even if they have drink right next to them takes time to drink it.
other things come in to play, MIG mild steel with CO2,
run real fast and for a good amount of time you will freeze the flow meter (I have done it
)
have to get it thawed, takes time
.
then you have to move yourself (can only reach so far and make so long of a weld)
and sooner or later move the material
then replace the material with the new part
and the harder and faster you work the sloppier and slower you get as time goes on
I personally have no experience at that type production work
my crews and myself never had any production work that wasn't precision work ie aerospace work
so everything I have ever thought about business wise was do it to print the first time and save time, material and $$$$$
(counting beans again flux
)
all is IMHO
sincerely,
Kent
edit: forgot to add about heat and distortion
which is a whole new topic
in the old days days, used to ask about how long a welder had their hood down,
now with auto dark helmets can be 8 full hours
if I was not old and half blind I would have a hood on everywhere but bed
used to wear cutting goggles 24/7