As in girder jockey iron working, or fab shop shuffling parts materials around, welding stuff...... What kinda of work are you going to be doing and with size iron..... Will determine if you need Metatarsal guards, just steel toe, in a shop/foundry or inside, or out in the field installing stuff.... I would consult your employers hand book about what PPE is required, or if your a sub, find out what the client requires with in their facility.....
I like loggers/wildland fire style boots myself for everything from shop work to field install, to kicking around at home to hiking/hunting in the back country, to the tune of 14 hours a day most of the time and as long as 42 hours on a couple of ocassions... I wear Nicks or Whites nearly 100% of the time.