Inside corner to inside corner is the best. The only time you might use something different is if the weldment you're working on doesn't allow it. :thumbsup: I worked in a shop with a second year apprentice who figured he was the lead hand, even though I was hired to be the shop supervisor (that's another story). He was building 4' square fire boxes and cutting a bunch of the plates smaller to fit inside the other plates and then getting other guys to go inside a manway to weld the inside. I tried to explain he could cut all the plates the same size and he wouldn't have to weld the inside but he thought he knew everything. Even worse was that the boxes had an angle iron frame around the outside as well. Not only was there a lot of wasted time and weld, the outside welds had to be ground flat to fit the angle iron frame on the outside. With inside corner to inside corner, there'd be very little grinding required to fit the angle iron. More time was spent just on the extra welding and grinding than what the entire boxes should have taken to complete. Anywhere else a guy like that would probably be run off for taking 3 times longer to a job because he "knew it all".
