If you use lap weld it won't be any problem for making the exposed weld, i.e., that on the tube ouside. However, how are you going to make the hidden weld, i.e., that on the tube inside?
If the tube is extruded, would it be possible to make it seamless? If seamless steel pipe is made by extrusion, it should be possible to make also aluminum tubing.
Giovanni S. Crisi
Sao Paulo - Brazil
Let me see if I've understood exactly what you're meaning.
In a lap weld, the ends of two different plates overlap and there are two welds to be done, one on each side of the overlap.
In this case, what overlap are the sides of the rounded strip the tube will be made of. You say that only one weld will be done: the one exposed, i.e., the one located on the tube outside, right?
In this case, let me tell you that back in my days of erector engineer I installed thousands of Admiralty brass condenser tubes which were 18 BWG in thickness (i.e., not too different from yours) which were resistance welded. Resistance tube weld is a butt weld. Wouldn't it be possible for you to resistance weld your tubes? Or, since they will be extruded, make them seamless, as I said on my first answer?
Giovanni S. Crisi