|
Hi Frank, Why grind the weld head weld beads out flush? I thought I would clean the void areas by blasting down to white metal and then just TIG them up. Is that not the best plan? I like the idea of just MIG welding up the pitted areas. Do I need to grind at all if I blast down to white metal in the pitted areas? Using the same type of material might be a problem, since I don't know for sure if my hull is A516 GR70 or A36. I figured there must be a good way to test it some how to find out. Szybowski From: ShellyDalg@aol.com Date: Thu, 29 Jan 2009 15:44:18 -0500 Subject: Re: [PSUBS-MAILIST] Pitting Rust against Voids To: personal_submersibles@psubs.org Hi Brent. As an "old school" welder, I can suggest grinding all
those weld areas out flush, with special attention to the "under-cut" areas.
That's not so much a heat problem as it is the welder not watching close enough
what the puddle is doing. Still, it's pretty easy to repair. On the "pits" from
corrosion, just make sure you grind it out really clean, pre-heat the area
well, and use the same material to fill it in as the areas are made of. A mig
gun is good for that job if handled correctly. I usually prefer TIG over other
methods because it's easier to see what's happening at the root, and eliminates
any chance of inclusions or voids. But for filling in pits, a mig is fast,
clean, strong, and easy.
That hull still looks pretty good, and it shouldn't take too much to
get it "better than new".
Hope you're doing OK with that nasty weather you're having. Frank
D. A Good Credit Score is 700 or Above. See yours in just 2 easy steps! |