spot welding with mig

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I read through the manual for my Clarke 130en and it mentioned something about a spot welding attachment, or using the gun in spot welding.Usuallyl I though spot welders clamped thin metal between tongs and then sent a large current to fuse the metal at the point of contact. How would you do this with a mig setup?I've got some things I need to spot weld and was considering buying one of the Harbor Frieght hand held spot welders. But, if I can make this mig do it that would be great.thanks
Reply:they were probably talking about using the "clark" as the power source for the attachment.  As for spot welding with the mig gun, no promlem,.  If you are spoting panels ie.. body panels, sheetmetal, make sure you space your spots out or you will end up with a warped mess.
Reply:You can also use a plug welding approach with a regular MIG welder.  Drill a series of holes (3/16", 1/4", etc.) along the seam edge of the top sheet, then lay this piece on the partner.  Use a MIG welder to build up the "missing" material in the holes.  This will fuse it to the bottom sheet and to the sides of the holes you drilled on the top sheet.  It's not exactly a spot weld, but it doesn't require any special equipment and it ends up being pretty close.  The plug welds can also be ground smooth without worrying about removing too much of the bond between the sheets.  Air-driven flangers with a hole punch on the other side are reasonably priced and easily set up the plug welds.
Reply:I think I might give this a shot. I really am not going to be doing enough to justify a special attachment.
Reply:Dog,Vette Gator is on the right track.see this ESAB link:http://www.esabna.com/EUWeb/MIG_handbook/592mig11_1.htmWhat is not shown in the ESAB link is the "spot weld nozzle" such as shown in the following link.  The stand off feature of the nozzle allows the nozzle to be placed in contact with the sheet surface, holding a constant tip-to-work distance, and allowing shielding gas flow. http://daytonamig.stores.yahoo.net/spotweldnozzle.html