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 Tig Welding		  New Topic  Topic Locked
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dante
Deckhand

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3 Posts
Initially Posted - 09/25/2004 :  10:52:44  Show Profile
Four or five months ago I removed the stern railing on my '83 FK/TR C25 and had a local welder tig weld several spots on it which had either cracked or had come completely apart. Now every one of these welds is rusting.

How do I remove the rust, and prevent it from reappearing?

Dante
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ClamBeach
Master Marine Consultant

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3072 Posts
Response Posted - 09/25/2004 :  11:03:07  Show Profile
Q. How do I remove the rust...

A. There's lots of metal cleaning&polishing compounds out there... Last time around I used Meguiar's fiberglass cleaner/wax (has a very mild abrasive) and it worked well. (I was waxing/cleaning the boat and decided to try it on the stainless).

Q... and prevent it from reappearing?

A. You won't. The heat from the welding process has removed some of the anti-corrosion alloying from the stainless steel. This side-effect of welding is difficult to avoid.. you gotta run really low heat. Keeping the area waxed may slow things down.
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Derek Crawford
Master Marine Consultant

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USA
3324 Posts
Response Posted - 09/25/2004 :  17:57:04  Show Profile
Try to remove all the rust and then apply Wichinox according to the directions. It probably won't be a permanent solution - but it will slow down the rust's return.
Derek
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John Mason
Admiral

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USA
687 Posts
Response Posted - 09/28/2004 :  14:40:30  Show Profile
Next time, you might look for a different welder. I had some stainless welded about two years ago, it has sat out in all conditions ever since - not a bit of rust. It is possible, if the welder knows what he's doing.

I'd be just a bit upset about it. Is it possible to talk to the guy and have him re-weld it correctly?
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tinob
Master Marine Consultant

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USA
1883 Posts
Response Posted - 09/30/2004 :  12:45:27  Show Profile
It's possible that the welder used the wrong wire in his weldments. Heat will displace some of the cromium in the stainless but can be offset with the appropriate wire that can augment the bright metal lost.

It's been some time since I welded stainless but Dave L. might jump in and clear up the problem. I'm not sure a solution is in the offing, short of rewelding with the right wire.

What say you Dave?

Val on Calista # 3936
Patchogue, N.Y.
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Keith D.
Navigator

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USA
233 Posts
Response Posted - 10/01/2004 :  00:01:56  Show Profile
You need to go back to your welder and find out what filler wire he used when he TIG welded it. See if you can find out the exact rod he used by number. Stainless will be an E308, E316, E410 or E502, these are the most common stainless. If he tells you he used an E7010, E7014, E6011or E6010 or something like that he used a steel filler rod. If it is rusting that fast he probably used steel filler wire which is more common than stainless. If he did all you will be able to do is to grind it back out and either TIG or MIG it back with stainless wire. As a quick check you can get out a magnet and see if it likes the weld spots.
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aeckhart
Master Marine Consultant

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USA
1709 Posts
Response Posted - 10/02/2004 :  11:10:08  Show Profile  Visit aeckhart's Homepage
Keith,

Great answer. I'm printing and filing for future reference.

Thanks,

AL
GALLIVANT #5801
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lcharlot
Master Marine Consultant

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Antigua and Barbuda
1301 Posts
Response Posted - 10/03/2004 :  11:18:15  Show Profile
<blockquote id="quote"><font size="1" face="Verdana, Arial, Helvetica" id="quote">quote:<hr height="1" noshade id="quote"><i>Originally posted by Keith D.</i>
<br />...go back to your welder and find out what filler wire he used... E7010, E7014, E6011 or E6010...If it is rusting that fast he probably used steel filler wire...
<hr height="1" noshade id="quote"></blockquote id="quote"></font id="quote">

Any welder who would use carbon steel rod for welding a stainless steel part is either incompetant, totally clueless, or was deliberately negligent. If the magnet test reveals the welds to be carbon steel, I think the welder owes you a do-it-over and an apology.
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Notice: The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.