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Three words..... Penetration without undercutting.
Lots of different situations/materials/joints/heat treat etc, but in general if a weld truly has to be as strong as the parent material, it has to fully penetrate. It is truly very easy for anyone to learn to put down a "pretty" looking bead with mig, but as others have implied above, a pretty bead laying on the surface of a joint means nothing in regard to strength of the weld.
Fortunately most guys mig welding in their garages are welding relatively thin materials where penetration is easily achieved and the items they are welding (auto body sheet metal) often are not stressed components.
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German autos: '79 911 SC, '87 951, '03 330i, '08 Cayenne, '13 Cayenne
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Men do not quit playing because they get old.... They get old because they quit playing.
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