dirty aluminum
dirty aluminum
(OP)
I'm trying to weld an insert in an old aluminum boat. Coast Guard makes you weld 3 inches past new weld on bottom at round bar. My question is how to weld to the old trapped in dirt that I can't grind out. My weld must pass a dye pen test. I can't get a good weld where the dirt is trapped. Thanks for any help.





RE: dirty aluminum
Keep in mind that most sanding disks and grinding wheels are composed of aluminum oxide which is exactly what you are trying to remove. Wire brushing with a hand brush should remove any oxide that remains from the soft sanding disk.
Aluminum oxidizes vey quickly, thus welding must be done within four hours of cleaning for best results.
Best regards - Al
RE: dirty aluminum
RE: dirty aluminum
RE: dirty aluminum
If you are working underneath the boat, soak towels in the lye and press them up into place. Do not get any on you, wear rubber gloves and goggles.
When welding set the HF for max cleaning ,or as far as you dare to keep good penetration, watch out for salts boiling out of the aluminum as you weld.
RE: dirty aluminum