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Challenge for Welder and Other Steel/Fabrication Experts

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Challenge for Welder and Other Steel/Fabrication Experts

Old 05-31-2007, 07:59 PM
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Default Challenge for Welder and Other Steel/Fabrication Experts

I have a project where I need to attach 6 - 2 foot long steel bars ( 1-1/2" x 1/4" thick) to a cast iron caisson, underwater. The thickness of the cast iron sheets are 1-1/2" thick. The water is approx. 5' deep around the structure. As I understand it, welding cast iron is extremely difficult and underwater is pretty much impossible.

Any thoughts?
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Old 05-31-2007, 08:07 PM
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Default Re: Challenge for Welder and Other Steel/Fabrication Experts

Are the bars connecting perpendicular or adjacent to the cast iron sheets? Maybe try brazing, although I don't know how that would be done under water. You could use a bolt anchoring system drilled into the cast iron and use brackets along side or "feet" on the ends of the bars.
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Old 05-31-2007, 08:33 PM
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Default Re: Challenge for Welder and Other Steel/Fabrication Experts

Do you know who makes a drill that can drill underwater? I Googled and saw nothing. I was thinking pneumatic but it would have to be pretty slow though.
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Old 05-31-2007, 08:38 PM
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Default Re: Challenge for Welder and Other Steel/Fabrication Experts

Can you somehow weld a type of clamp onto the bars, and just clamp them to the sheets?

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Old 05-31-2007, 08:53 PM
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Default Re: Challenge for Welder and Other Steel/Fabrication Experts

tinmarine - 5/31/2007 9:38 PM Can you somehow weld a type of clamp onto the bars, and just clamp them to the sheets?
The structure is basically a 30' diamter pipe so the clamp/strap would have to be 100+ feet long.
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Old 05-31-2007, 09:06 PM
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Default Re: Challenge for Welder and Other Steel/Fabrication Experts

Sorry, no I don't. All the metal work I've done has been above water. Why wouldn't a regular variable speed air drill work? Just make sure you oil the snot out of it first.
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Old 05-31-2007, 09:10 PM
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Default RE: Challenge for Welder and Other Steel/Fabrication Experts

Can't answer the welding question but we use air drills and impacts under water all the time. They work the same way as on land; very well.
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Old 05-31-2007, 09:16 PM
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Default RE: Challenge for Welder and Other Steel/Fabrication Experts

baitkiller - 5/31/2007 10:10 PM Can't answer the welding question but we use air drills and impacts under water all the time. They work the same way as on land; very well.
Thank you Sir! I just needed to hear someone else say it! [img]../images/emoticons/thumbsup.gif[/img]

I should probably oil the snot out of it , too, huh? [img]../images/emoticons/biggrin.gif[/img]
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Old 05-31-2007, 09:25 PM
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Default Re: Challenge for Welder and Other Steel/Fabrication Experts

And after.
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Old 05-31-2007, 09:29 PM
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Default Re: Challenge for Welder and Other Steel/Fabrication Experts

I am curious - what the hell kind of project do you have going on?
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Old 05-31-2007, 09:42 PM
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Default Re: Challenge for Welder and Other Steel/Fabrication Experts

[img]../photos/get-photo.asp?photoid=26947[/img]

Complete restoration, and then some. One task is tois to install anodes that are 24" long x 4" wide x 3" thick below the waterline.
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Old 05-31-2007, 09:47 PM
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Default Re: Challenge for Welder and Other Steel/Fabrication Experts

What are the steel bars for ? Ladder maybe

When you use an air drill under water , when done run it in a bucket of fresh water then run your oil through it,

Can you make a hanger [ hangs from lip of caisson ] .

Has the caisson already been pumped out and can you work on the inside ?

Lester
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Old 05-31-2007, 09:54 PM
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Default Re: Challenge for Welder and Other Steel/Fabrication Experts

welder - 5/31/2007 10:47 PM What are the steel bars for ? Ladder maybe When you use an air drill under water , when done run it in a bucket of fresh water then run your oil through it, Can you make a hanger [ hangs from lip of caisson ] . Has the caisson already been pumped out and can you work on the inside ? Lester
Caisson is filled with concrete. The steel bars extend from the anode about 3" on each end.

Part # ZHS - 50 on this link: http://www.harboranodes.com/hull_anodes_weld_on.html
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Old 05-31-2007, 10:08 PM
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Default Re: Challenge for Welder and Other Steel/Fabrication Experts

30' In diameter is no big deal to make a band for.. So it's 100' long Steel is cheaper than any of the methods of attaching to the cast, weld all your anodes to the 100' long band (five 20' +/-pieces) before it gets to the water.
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Old 05-31-2007, 10:14 PM
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Afishinado - 5/31/2007 11:08 PM 30' In diameter is no big deal to make a band for.. So it's 100' long Steel is cheaper than any of the methods of attaching to the cast, weld all your anodes to the 100' long band (five 20' +/-pieces) before it gets to the water.
Yes, but the band must have continuity to the structure. Can't be any organic matter, dirt or debris between the two or the anodes won't perform right.
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Old 05-31-2007, 10:25 PM
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Default Re: Challenge for Welder and Other Steel/Fabrication Experts

Pin them on with an Air Nailer

We use to shoot metal decking down with steel pins.

The band idea is a good one, use some turn buckles to snug her down

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Old 05-31-2007, 10:41 PM
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Duct tape. Duh.
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Old 06-01-2007, 03:13 PM
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Default Re: Challenge for Welder and Other Steel/Fabrication Experts

Make stand-off's with stainless steel threaded bar stock tapped into the caisson and nuts and washers to tighten down on holes drilled into the anode.
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Old 06-01-2007, 06:39 PM
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Default Re: Challenge for Welder and Other Steel/Fabrication Experts

No help here, but just curious. Is that Bloody Point Bar light? Always loved seeing that marker when returning to Annapolis from Norfolk.
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Old 06-01-2007, 08:08 PM
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BTW if your going to do any tapping into cast iron, go with as coarse a thread as you can get.
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