Hi,
I have a Henrob/Cobra--bought it a couple years ago. I watched a live demonstration, and the guy was a real master with it, in any application. Unlike other torches, it uses very low gas pressure. It's a wonderful torch for cutting--the videos are accurate; if you practice a bit you can cut very intricately and with remarkably clean edges.
I have also welded sheet metal with it; the responses above in my opinion are correct. It will do the job, but it's a bit more difficult because of the heat displaced over the panel, etc. You really have to watch out for warping. I practiced a lot with it, but I discovered that I can do a better job with my Hobart Handler 140 MIG welder when welding 24-18 gauge. I can get better penetration and I can fill holes more efficiently and with better bonding power, and with a lot less heat distortion. One advantage of oxy/acet welding is that you can weld metal that is not entirely, perfectly clean; in addition, it's a softer weld, so you can work it more easily with a hammer and dolly. Actually, it's nice to have both methods at your disposal and there are applications for both; though since I've purchased the Hobart, I've stuck with that pretty religiously for welding thin sheet metal.
I should add that I am really a novice, self-taught welder with both torch and MIG.
JM
