The wall thickness is precised by the sch40 pipe for diam1" (0.133), length of the two pipes:18". Material ASTM A53, I will try different type of weld, or material strength... once I will have some calculation to work with. I already worked on the maximum torque that can be supported by the material itself. Now I just need some information about what kind of welding I can use there. If you tell me that any kind of welding will be stronger than the tubing, then I have the answer I need, except that I don't have any figure to justify it.
Thanks