Art Pfenninger wrote:
>
> No relation between arc and oxy-acetayne. But if you get good with
> the torch then you won't need the arc welder. For most everything you do a
> torch will work and will not destort the metal as much.
I *HIGHLY* disagree with this. (and I've got the burns to prove
it!)
MIG welding is a lot cooler on the metal than torch welding,
especially
on the surrounding area.
Compare the Heat Affected Zone (HAZ) on a MIG weld to a torch weld,
and it's fairly clear. The metal discoloration from a MIG weld on
sheet metal is usually confined to a half inch or so on either
side of the bead. With a torch, you get that much of the area
red hot and the discoloration goes much farther.
> For those without a torch welding shops sell brazing rods that can
> be used with propane.
Are you my DPO? ;>
Brazing is acceptable for some cosmetics, but I wouldn't dream of
doing sills with them, it simply isn't as strong. (not to mention
the fumes, which rules using it out in a lot of shop environments)
--
Trevor Boicey, Ottawa, Canada.
tboicey@brit.ca, http://www.brit.ca/~tboicey/
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