</font><blockquote><font size="1" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">quote:</font><hr /><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Originally posted by 4Crawler:
<strong>[QUOTE]Also try the different polarity and/or AC settings to change the heat going into the metal (if your welder supports this). Reversing the polarity (make the electrode negative) will greatly reduce the heat into the metal, and running AC is about 1/2 way between the two. This is the main advantage of having an AC/DC welder, gives you added flexibility.</strong></font><hr /></blockquote><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Roger, is this true for MIG welding as well?

</font><blockquote><font size="1" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">quote:</font><hr /><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Originally posted by thecarterman:
<strong> </font><blockquote><font size="1" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">quote:</font><hr /><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Originally posted by 4Crawler:
<strong>[QUOTE]Also try the different polarity and/or AC settings to change the heat going into the metal (if your welder supports this). Reversing the polarity (make the electrode negative) will greatly reduce the heat into the metal, and running AC is about 1/2 way between the two. This is the main advantage of having an AC/DC welder, gives you added flexibility.</strong></font><hr /></blockquote><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Roger, is this true for MIG welding as well?</strong></font><hr /></blockquote><font size="2" face="Verdana, Tahoma, Arial, Helv, Helvetica, Sans">Unfortunately no, MIG (gas or flux core) have to be run the proper polarity, hard wire is electrode-positive and flux core is usually electrode negative.

Here's a neat chart I found on the Army training material welding site http://www.adtdl.army.mil/cgi-bin/atdl.dll/tc/9-237/toc.htm
about welding polarity... Lots of other good welding info also...

<img src="http://personal.atl.bellsouth.net/rdu/e/_/e_dan/weld_polarity.jpg" alt="" />

Also have a link to this site on the "Welding" page link in the signature below..

That looks like a good site. I bookmarked it for future reading.

I welded it up last night. I tack welded the inner seam on top and bottom, then made sort welds across the gap letting it cool inbetween welds. This worked great. It also cause less heat distortion of the intended bend.

Thanks for your help.

hey Kendall-

I make most of my cuts in square tubing w/ a standard circular saw w/ a metal cutting blade. Just set the depth so that it doesn't cut thru, set the desired angle on the miter guage or lay them out w/ a carpenters square and have at it. Ya just have to plan which side to cut to for a good clean, straight, easy to weld bend. The kerf on the blades I use is 1/8", so ya have to offset both cuts that much. Two cuts at 22-1/2 degrees make a real clean 45 degree bend.

later

That is what I did, except with a chop saw. The problem was I only needed a little bend around 6 degrees. I ended up with a little too much material removed and had a gap at the proper angle. It did come out good, nice and clean look that way.