Showerthought: I cracked a weld on a gate hinge Tuesday and the fix taught me more than any class
I was rushing a set of driveway gate hinges at my home shop in Bakersfield last Tuesday, trying to finish 6 pairs before a client pickup at 7pm. I cooled the first weld in the slack tub instead of letting it air cool, and heard that little ping about 20 seconds later, a hairline crack right along the toe of the bead. I almost shipped it anyway, but the client was a ranch guy who hauls horse trailers, so I cut it out and started over with a preheat and a slow cool under a welding blanket. Took me an extra 2 hours and dinner got cold, but that hinge is still holding 5 months later. I get that people air cool small stuff all the time with no problem, and maybe I'm being dramatic, but heat control is the one thing I refuse to shortcut on structural pieces. Where do you all draw the line on quenching, is it size based or type of steel based for you?