Body panel replacement tips/advice needed

I'll share what my Teacher shared with me.

When he welds a full panel on, he will keep his beads under or around 1" long. Once he stops, he immediately grabs his grinder and grinds it flush. It makes the weld small before the heat spreads and therefore, doesn't spread a lot of heat causing warpage. He skips around the panel running his beads in places where the panel is cool until he's filling in the spaces between welds, grinding each one as he goes. And going one step further, he also spot blasts each weld as he goes to expose moisture holding pinholes that he welds shut.

I thought it was crazy as it takes quite a while to weld a replacement panel on but it works-I have never seen a quarter panel he has welded on that warped anywhere.

Ken