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Old 03-22-2006, 06:01 PM   #1
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I need to weld a small bracket on one of the braces of my chassis but didnt know if I need to do something special before doing so. Like disconnecting the chassis battery or or house batteries etc?

Anyone have any tips for that?

Thanks

Don
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Old 03-22-2006, 06:01 PM   #2
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I need to weld a small bracket on one of the braces of my chassis but didnt know if I need to do something special before doing so. Like disconnecting the chassis battery or or house batteries etc?

Anyone have any tips for that?

Thanks

Don
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Old 03-22-2006, 06:28 PM   #3
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You don't mention what kind of chassis you are welding. My workhorse chassis manual suggests that you should not weld anywhere on the chassis since it can somehow do bad things to the computer in the transmission. I don't know if disconnecting the battery will address that situation or not. Might want to check your manuals (chassis, transmission, etc.)
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Old 03-22-2006, 06:34 PM   #4
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Seems there used to be precaution about welding on car frames --- something about keeping an arch from traveling from the engine block (bearing cap) to the crankshaft and leaving a nasty burr . . . but I don't remember what needed to be done to prevent it. Had to be somehow properly grounded or something.
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Old 03-23-2006, 03:39 AM   #5
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Sorry, it is a w22 workhorse chassis and I didnt even think about a tranny computer. I was worried about ECUs etc.

I better call workhorse

Don
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Old 03-23-2006, 06:37 AM   #6
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My dealer had Camping World install the hard Rock shield on My RV -part of the purchase deal and CW used a torch, if I remember right.
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Old 03-23-2006, 07:16 AM   #7
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Arc welding can conceivably damage any attached electronic part. There is ahuge surge through the entire frame when the arc is started or stopped (and probably while welding too). Disconnecting the battery cables, both hot and ground, helps, but I don't know if it is a guarantee. A torch is safer - heat should not an issue with the massive amount of steel involved (as long as you are not too close to the electronic unit).
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Old 03-23-2006, 06:55 PM   #8
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I called my local Workhorse service center and they advised that they weld on exhausts and frames all the time with no problems. They said to be safe disconnect the battery and to connect the ground as close as possible to the weld.

Don
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Old 03-24-2006, 03:33 AM   #9
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I've been lurking watching replies...
I've heard the same things that rotts4u said above. Disconnect coach & chassis battery grounds, and keep the welder ground real close to the work. I also heard to disconnect the engine ECM (brain) and the Allison brain; -figured both plugs could be found under the doghouse cover.
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Old 03-24-2006, 05:56 AM   #10
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I just removed the ECM and had it re-programed by Brazel's. I was able to remove the plugs by sliding the doghouse cover open about 12" and lying on top if it. There are two plugs in the ECM and one plug in the Allison brain. In my RV, the Allison is stacked on top of the ECM. I think I used a 7mm socket
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Old 03-24-2006, 06:57 AM   #11
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Good deal rogueii.
Keep us posted about the Ultrapower ECM program change and your impressions, pro or con.
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Old 04-09-2006, 07:49 PM   #12
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It depends largely on where you are welding. They tell you to disconnect computers, batteries, etc because if someone hooked up the ground in the wrong place and it passes through a cable to get to where you are welding then YES you will do damage. You see people welding all the time on frames but people that know what they are doing connect the ground close to the spot or on the heavy structure directly involved to what they are welding with no problems. An example is you hook the ground up to a part of the engine like an easy bracket on the mount to the engine. Of course you intend to weld the frame just below that, they are close right? Point is here the motor mount has a rubber mount, so the ground goes through the same grounding cable from engine to frame that the computers are hooked up to. You just fried your computer.
You also have to be careful about amount of heat you are intending to use in how much weld you are laying down. You can change the strength of the frame indirectly by heat transfer. But if you are doing a small section with maybe at most two inch welds, you are not going to hurt anything, provided the ground is in the correct spot for the welding that you are doing.
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Old 04-12-2006, 12:09 PM   #13
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You guyz make me nervous, I just redid my exhaust system, all that welding
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Old 04-12-2006, 12:16 PM   #14
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No reason to be nervous, you'll be fine.
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