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Science Forum Index » Engineering - Joining (Welding) Forum » newbie baffled by different subject
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| z |
 Posted: Fri Mar 28, 2008 11:31 am |
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Guest
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OK... (thanks for the welder advice) now on to some application
questions; for patching car body rust, why is welding the attachment
fashion of choice? Rather than brazing, or even soldering? (there's
actually some body lead in the back of this garage...) i'm not talking
about serious structural work, just little rust holes that half the
world patches with fiberglass. my concerns are regarding the heat
warping the metal, as well as the propensity of welded metal to rust
more. (full disclosure... last time I did anything of the kind, it
involved bicycle frames long ago when they were brazed to avoid
warping and such, rather than tig welded like now) |
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| Tim Wescott |
| Posted: Sun Mar 30, 2008 3:37 pm |
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Guest
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z wrote:
Quote: OK... (thanks for the welder advice) now on to some application
questions; for patching car body rust, why is welding the attachment
fashion of choice? Rather than brazing, or even soldering? (there's
actually some body lead in the back of this garage...) i'm not talking
about serious structural work, just little rust holes that half the
world patches with fiberglass. my concerns are regarding the heat
warping the metal, as well as the propensity of welded metal to rust
more. (full disclosure... last time I did anything of the kind, it
involved bicycle frames long ago when they were brazed to avoid
warping and such, rather than tig welded like now)
A brazed joint in sheet metal is brittle (or at least I've seen a lot of
them with hairline cracks). A soldered joint is much worse -- body
solder should only be used as a filler, in thin layers, over
structurally sound steel. If you're using more than 1/16" then you need
to learn more about sheet metal.
If you've declared the car to be end-of-life and you just want to keep
it going for another year or two then go ahead and patch the rust with
fiberglass -- the patch will last until some more important part of the
car falls off. If you're trying to make things as good as new then cut
back to good metal and patch by welding.
--
Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
Do you need to implement control loops in software?
"Applied Control Theory for Embedded Systems" gives you just what it says.
See details at http://www.wescottdesign.com/actfes/actfes.html |
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| z |
| Posted: Mon Mar 31, 2008 7:02 am |
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Guest
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On Mar 30, 4:37 pm, Tim Wescott <t...@seemywebsite.com> wrote:
Quote: If you've declared the car to be end-of-life and you just want to keep
it going for another year or two then go ahead and patch the rust with
fiberglass -- the patch will last until some more important part of the
car falls off. If you're trying to make things as good as new then cut
back to good metal and patch by welding.
letting go is hard..... |
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