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Just as you would "stitch weld" a factoy spot welded seam, try not to weld across the entire width of semi-stuctural sheet metal. Imagine the piece you are welding and the direction of loads on it. Then imagine the welds you are about to make as deep cuts. Many times welding on factory stamped metal will weaked the original metal at the point of the weld, leaving a line for future cracks.
When adding metal, spread the welds out laterally and try to make the new metal large enough to take the welds away from high stress areas. Common practice for welding the factory seams is to leave space between small half to one inch welds like this _ _ _ _ (stitch weld), this can also be used for adding structure. Take your time to keep things cool, as things move when they're hot.
Happy fabricating,
Christian
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