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How to break welds?

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Old 05-04-2002, 02:27 PM   #1
Hg
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How to break welds?

How would I break a weld that is about and inch or so long on exhaust pipe? I'd really like to not have to cut the pipe if at all possible. Would I just kinda take a saw and cut through the weld? Or take a screwdriver and hammer and chip at it? Any ideas? Thanks.
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Old 05-04-2002, 03:35 PM   #2
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I would probably use a hand grinder or a die grinder with a cutoff wheel to grind the weld away. You might have problems with a hack saw blade because the weld might be harder than the blade.
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Old 05-04-2002, 04:00 PM   #3
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dremel maybe???
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Old 05-04-2002, 09:44 PM   #4
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I'm about to find out, gotta cut the weld on my cat/y-pipe so I can get the bastard off. Hope I don't wear my damn dremel out or screw up the y-pipe (TES headers, $115 to replace y-pipe...)
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Old 05-04-2002, 10:15 PM   #5
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Let me know how it goes Is it welded completely on? The pipes I'm trying to get off only have about an inch weld on 'em, then clamps...
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Old 05-05-2002, 06:05 PM   #6
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Dremel might work if you have a hard enough bit for it. Depends on the metal really.
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Old 05-05-2002, 06:55 PM   #7
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A weld is not going to "chip" away. That stuff that does chip away is just slag. It's not the actual weld. You gotta grind/cut/ or both. If it was just a tack-weld, there's a chance you could snap it off, but if it's an inch, you'll just bend the metal around it. I doubt a Dremel would phase it, but give it a shot if you have a whoooole lotta cutoff wheels laying around.
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Old 05-05-2002, 07:36 PM   #8
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ya, chances are the weld is stronger then the actual pipe.. depending on how good the person who welded it was..
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Old 11-19-2009, 03:29 AM   #9
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Re: How to break welds?

A dremel with the fibreglass matrix cutting disc will take it off cleanly.
If you force it the fibreglass disc wears quickly. Keep the rpm's up and
feed it easy. Don't get in a rush.
The grinding stones are tooo slow.
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