Dressing a weld is to GRIND it.
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This article will concentrate on the dressing (grinding) procedures
to ensure a proper weld.
http://www.pnlestimology.com/wp-content/uploads/2012/02/Proc...

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Note added at 3 hrs (2015-04-22 11:26:15 GMT)
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https://rts.i-car.com/collision-repair-news/dressing-gma-mig...

Once the weld is dressed, it would be like grinding off the head of the rivet. Is the joint as strong?

As far as tool selection, a common initial tool to use is an angle grinder, with a 36 or 50 grit disc depending on the size of the bead or nugget (see Figure 3).

t doesn't matter if you move the grinder across the weld or lengthwise down the weld, whatever works best for you. The important part is always being conscious and careful to not grind into the base metal.

Another tool that can be used is a cutoff wheel, but this tool is not as precise a tool as an angle 947
Figure 4 - A cutoff wheel, which is used on the edge of the wheel, is not as precise as an angle grinder. grinder (see Figure 4).



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Note added at 3 hrs (2015-04-22 11:28:09 GMT)
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A VIDEO of dressing/grinding welds
https://www.youtube.com/watch?v=fOmttKhbsBM