precautions to be taken before welding work - Mercedes-Benz Forum
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post #1 of 18 (permalink) Old 06-17-2019, 11:27 AM Thread Starter
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precautions to be taken before welding work

hi. there is a broken part above left shock mount and need to be welded. do I need to unplug batteries, also ecu or something else? I don't think I can unplug everything so what is the safest way to start this job. thank you.
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post #2 of 18 (permalink) Old 06-17-2019, 01:19 PM
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Disconnect negative and positive cables at the battery. Disconnect ECU plugs, just to be safe (I'd do it).
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post #3 of 18 (permalink) Old 06-17-2019, 04:17 PM
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^ Agreed. Make sure your ground has a good, clean connection. Also locate your ground as close as reasonably possible to the area being welded, since 100% of the current will be flowing through the metal between the ground and the weld.
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post #4 of 18 (permalink) Old 06-21-2019, 03:53 AM Thread Starter
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Is car radio going to ask for code after unplugging battery cables? I don't have that.
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post #5 of 18 (permalink) Old 06-21-2019, 08:43 PM
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yes. And what on earth came of the bodyshell that require welding? You have the worst luck with your car.
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post #6 of 18 (permalink) Old 06-22-2019, 09:40 AM Thread Starter
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yes. And what on earth came of the bodyshell that require welding? You have the worst luck with your car.
yeah absolutely. my mechanic said metal sheet part over the shock mount is loose and that makes the annoying sound while passing over the bumps. he said I'll remove shock and other parts and probably it'll need welding. can I get the code for radio from the dealer?
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post #7 of 18 (permalink) Old 06-22-2019, 11:07 AM
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Would you post a few clear, sharp closeup photos of the problem areas...? A rust out on a B is really strange...
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post #8 of 18 (permalink) Old 06-22-2019, 11:11 AM
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yes. And what on earth came of the bodyshell that require welding? You have the worst luck with your car.
yeah absolutely. my mechanic said metal sheet part over the shock mount is loose and that makes the annoying sound while passing over the bumps. he said I'll remove shock and other parts and probably it'll need welding. can I get the code for radio from the dealer?
Hey. I’ve had the same problem. I know how annoying is that sound when passing over bumps. In my case that was loosened protective cover of shock absorber. On the top of it, there is white plastic ring which makes that sound. Firstly check protective cover.
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post #9 of 18 (permalink) Old 06-22-2019, 11:57 PM Thread Starter
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Hey. Iíve had the same problem. I know how annoying is that sound when passing over bumps. In my case that was loosened protective cover of shock absorber. On the top of it, there is white plastic ring which makes that sound. Firstly check protective cover.
Are you sure? that white plastic cover is a very light part and I'm not sure it could produce a sound that anyone in the car can hear.
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post #10 of 18 (permalink) Old 06-23-2019, 12:07 AM Thread Starter
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Would you post a few clear, sharp closeup photos of the problem areas...? A rust out on a B is really strange...
I don't think it is a rust problem. When I first bought the car I heard very loud noise on left side and after a while turning steering became difficult. Then I took the car to a mechanic he removed the left spring and the spring was bent, spring was not carrying the car completely. He fixed the spring and a few days later I replaced both springs. Now it begins to make sense, probably previous owner had a small accident that affected left wheel. This loose part could be one of the affected parts I guess. She probably got on sidewalk or something similar and they didn't fix it properly.
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