I do the same - where it falls apart is on lap welds - with this torch, you won't get any heat into the lower layer & the weld will either be crap or look like a dogs backside. Butt welds are a doddle with any semi-decent/total garbage small flame torch. Where it will struggle (I.e fail) is on vertical welds/lap welds as you will have to dwell too long leading to holes. If you say different & can show, then I bow to your superior skillz.
