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CSU944's Avatar
 
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Cool Question for all you welders out there

What is the effect on the 944's electronics when welding (MIG/TIG) on the chassis? I really don't want to fry anything expensive; does anyone have any experience with this?

I have to weld my driver seat rail supports back to the floor pan tomorrow. The engine I just rebuilt is so powerful it ripped the driver's seat right out of the floor (he he he...)

-Tom
Old 09-27-2003, 07:46 PM
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What I've heard is disconnect the battery, and hook your welder's ground as close to the area you're welding as possible.

Sam
Old 09-27-2003, 08:12 PM
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BTW, is the floor pan aluminum or steel?
Old 09-27-2003, 08:49 PM
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Old 09-28-2003, 08:40 AM
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I've never unhooked batteries when welding on a car...... But then again, I don't recommend doing that either, pull the negative terminal.

Maybe even go as far as what FRWilk mentioned, as no one knows our DME better.
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Old 09-28-2003, 04:28 PM
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pull off the battery negative wire. this will protect against damaging the rectifier pack in your alternator. disconnect the dme unit--very important.
as an alternative, why not consider brazing, or gas-welding?
regards, bob.
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Old 09-28-2003, 05:39 PM
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Because TIG welding is sooooooo much fun!
Old 09-28-2003, 08:12 PM
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roger that^

i wouldn't take any risks when welding onto the chassis. The electrical components might be as electrically fragile as ever.
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Old 09-28-2003, 09:51 PM
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Aluminum or steel????? How about seeing if a magnet sticks to it....
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Old 09-29-2003, 02:46 AM
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anyways, my drivers seat came away, as i was pulling out of my driveway! quite a surprise, as i shot backwards, and had to take a firm grip of the wheel, to keep the seat in position!! had to laugh afterwards,but VERY glad that it did not happen on the freeway instead.
i removed the seat, and found that the nut that fits under the small panel, had pulled thru completely{both sides}. the metal was no good, with cracks, and too much wear, to try and re-seat it .
so, i cut 2 steel strips, about 1" wide x 4" long, 0.080" thick, and rivited them in position, with the clearance hole in, and nut fitted. then, at work, i gas-welded the strips, and no problems! it only raises the front mounting points by 0.080", or 2 millimetres, if you prefer.
anyone not having had this problem, i would seriously ask you to take your drivers seat out, and check the mounting points. you may not be so lucky!!
regards, bob.
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Old 09-29-2003, 08:21 AM
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That's exactly what happened here, but I haven't had a chance to fix it yet. I'll have time to do it tomorrow.

The PO didn't think this was a big deal....I guess he didn't mind going to full recline when he hit the gas. Good point about checking this stuff, maybe we can talk Porsche into doing a recall to beef up our seat mounts? yeah right......
Old 09-29-2003, 06:49 PM
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i bet if someone got into an accedent and the seat just 'ripped' out someone here could be a very very rice person... mmm... i smell a law suit...
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Old 09-30-2003, 10:32 AM
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Well, I got this fixed today. I did pretty much what Bigyagi did, but I disconnected the DME and MIG'd it. No problems with the electronics, and it sure feels nice to have a solid seat under my butt.

Thanks for your advice, everybody!
Old 09-30-2003, 06:32 PM
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