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<div class="moz-cite-prefix">On 6/10/2015 3:24 PM, Andrew Uprichard
wrote:<br>
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<div class="WordSection1">
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hopefully
a typo, but what you need is a MIG welder, not TIG.<o:p></o:p></span></p>
<p class="MsoNormal"><span
style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<br>
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</blockquote>
TIG is slow, but, properly done, will produce a bead far superior to
MIG welding and will likely put less heat overall into the metal,
reducing the amount of distortion and the amount of finishing
required, and it's the near-perfect process for tacking in patch
panels before final welding. TIG also has the benefit of using
pretty much the same hand skills as oxy-acetylene welding, so if one
starts on that process in a welding class, it's much easier to get
the hang of TIG. Moreover, the control available through the foot
pedal makes an enormous difference in weld quality. <br>
<br>
MIG is faster, a little cheaper, but quite splattery and noisy and
takes a fair amount of practice to achieve optimum weld
penetration. Today, I think of MIG as a production process, mainly,
and for joining in places requiring little cosmetic finishing.<br>
<br>
One can buy cheap MIG machines with limited speed control, so the
equipment can be had fairly cheaply, but the results very often
aren't that good. A high-end MIG machine suitable for skilled
amateur use, though, is not that much cheaper than an inverter-based
TIG welder good for 160-200 A or so, with the added benefit that
most TIG machines are fairly easily convertible to AC or DC stick
welding with an electrode holder change. Providing that the machine
has suitable high-frequency AC, TIG also does a superior job on
sheet aluminum. Additionally, if one doesn't have a spot-welding
attachment, one can do solid substitutes for spot-welded flanges by
drilling holes in one flange and using rose beads. More
time-consuming, but quite strong, and difficult to do with MIG
(unless one cuts slots in the flange).<br>
<br>
In terms you'll understand, TIG is a scalpel. MIG is a hatchet. I
don't say this as an amateur. For a number of years, I built
prototype machines, air handling equipment and the like, and
probably couldn't have done much of it without TIG. For the amateur
who's not concerned with production speed, mastering TIG is a
valuable skill, one that pays real dividends over MIG.<br>
<br>
<br>
Cheers.<br>
<br>
<br>
<br>
<br>
<pre class="moz-signature" cols="72">--
Michael Porter
Roswell, NM
Never let anyone drive you crazy when you know it's within walking distance....</pre>
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