Loading…
11
Vent: My dad, who's been welding since the 70s, said my welds looked 'too pretty' on a recent pressure vessel.
He came by the shop in Tacoma and pointed at a seam, saying 'A perfect stack of dimes can hide a cold lap that'll fail under stress.' That got me thinking more about penetration than looks. How do you balance a clean bead with making sure it's actually strong enough?
3 comments
Log in to join the discussion
Log In3 Comments
troyp377mo ago
My first pressure vessel looked like a robot did it, all perfect and shiny. My old foreman took one look and said it was the prettiest future leak he'd ever seen. Your dad's got a point, the x-ray machine doesn't care about good looks. I started running a little hotter and focusing on the sound of the arc, not just the puddle, and my pretty failures got a lot uglier and stronger.
8
harper_hart7mo ago
Yeah, but X-ray does catch cold lap.
5
sagea886mo ago
Talking about the sound of the arc is a great tip, but I want to push back a little on the "run a little hotter" fix. Just cranking up the amps can cause other problems like undercut or burning through the base metal, especially on thinner sections. The real trick is matching your heat to the joint design and thickness. For a thick pressure vessel, you might need that extra heat, but you also have to watch your travel speed and angle to make sure you're digging into the root. It's less about a single setting and more about the whole setup being right for the job.
0