On Wed, 10 Jul 1996, Mark Jurras wrote:
> I have seen a bit of discussion about spot vs MIG welded panels. I am
> no expert on weldong but, spot welds can be done with a MIG. To do this
> drill a small hole (~1/8" or so) in the front panel where it touches
> the rear panel.
>
>
> Front Rear
> Panel Panel
> \ /
> \/
> ||
> ||
> Hole > |
> ||
> ||
>
> Next weld the rear panel to the front panel inside the hole and fill the hole
>
> Front Rear
> Panel Panel
> \ /
> \/
> ||
> ||
> Weld > @|
> ||
> ||
>
> grind the weld flat and you have what looks and acts like a spot weld.
>
> Any MIG experts out there that can describe this better than I did?
You described it fine. I prefer the hole to be larger, 3/16 - 1/4 inch.
It makes it easier to be sure the back panel is tight against the front
(you can see through the hole), and gives a larger weld area and better
penetration. You weld around the edge of the hole. This is sometimes
called a rosette weld or a plug weld. I tend to use a hotter setting on
the welder than I would use if seam welding two sheets, because the
welding only lasts for a few seconds.
I have a pneumatic tool that is very handy for this. It is a flanger,
which presses a flange into a panel so a repair panel can lie flush. The
other side of the jaw punches 3/16 inch holes for plug welds.
Ray Gibbons Dept. of Molecular Physiology & Biophysics
Univ. of Vermont College of Medicine, Burlington, VT
gibbons@northpole.med.uvm.edu (802) 656-8910
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