Look like progressive shocks-if you twist the top section lines will appear I think mine had about five lines the more exposed lines the harder the shock.
Progressive 440. I have a set on my R3. Set at minimal preload works best for me. 07 Classic solo rider, 220 lbs. Nice set, dirt cheap.
Righty tighty, increase preload, lefty loosy, decrease preload.
Calling that a weld is a stretch of the imagination. (Yuk) Either way looks like someone attempted a repair job. Shocks from the manufacturer have no bare burn spots.