Thanks for all the replies - I'll look into the acid options
locally.
As for the welding - I think my best bet is to suck it up - remove
the rear pulpit and take it into a shop for welding. The broken
weld is right at one of the deck anchors so it would be tough not to
damage the boat. Plus then they could properly repair the crappy
weld job the mobile guy did -- I don't think he used stainless for
the core.
Thanks,
Mark
There is no cure for birth and death save to enjoy the interval.
- George Santayana
On 2015-08-18 1:00 AM, Russ &
Melody via CnC-List wrote:
Hi Mark,
I use phosphoric acid ~ 50% and a "scotchbrite" pad to clean up
rust stains. I think the principle ingredient of CLR is a dilute
version
of what I use so it might take more time. Scrubbing with the pad
&
acid defiantly speeds things up, allowing you to rinse in less
time than
a soak.
Any significant heat treatment (welding) on S/S will affect it's
protective oxide layer. To restore the affected area we use a
"pickling paste" which is just a fancy name for a really strong
acid thickened enough to hang almost vertical for a while doing
it's job.
Copious amounts of water is recommenced to be on hand to get rid
of it.
The best welding process for anything that cannot be removed from
the
boat is shielded gas, TIG or MIG, not a fluxed electrode. A tad
more
expensive but a much better job and no splatter clean-up.
If you have to go other and with any grinding keep the decks wet,
water
flowing, around the work area. This will prevent hot stuff
sticking to
soft stuff.
Cheers,
Russ
Sweet
35 mk-1
At 12:48 PM 17/08/2015, you wrote:
Last year I had
noticed a small
crack in my rear pulpit tubing.
This spring before launch I hired a mobile welder to come out to
the boat
repair the area - he had a tough time with the wind swirling and
had to
repeatedly grind down the dirty weld to do it over.
The final repair was adequate (pretty rough - but sealed the
crack and
seemed solid). Unfortunately a few weeks later I discovered a
million little rust stains in the gel coat. We tried to scrub
them
out with Comet - but mostly just brightened up the gel coat.
CLR
didn't seem to do much - maybe a longer soak?
Any suggestions on cleaning? I'm wondering about doing a bit of
a
white wash with stain to see if that will clean them.
Now the area he repaired is showing some signs of rust -
obviously he
welded with steel and that is rusting. I had another weld that
gave
way (a lower bracket on the rear pulpit) - and I'd rather avoid
repeating
the same issue. Not sure how close to fiberglass they can
safely
weld - removing the whole rear pulpit wouldn't be a fun process,
but
likely smart to get it done properly.
Any specific questions I should be asking of a stainless welder?
Recommendations in Halifax area?
I'm also wanting to build a small arch for a solar panel - maybe
integrated right into the rear pulpit
Mark
CS 30 - Prosecco
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