No the opposite, weld 2 inches, leave a 2 inch gap, weld 2 inches, etc. If you prefer the above look, you would back stitch; weld as I mentioned, then when done, go back and weld the sections you skipped. This helps with the heat dispersion and blowing through the thin metal.
Most race car chassis are stitch welded. Factory cars are usually only spot welded and they hold up well.