How do i know if i'm allergic to aluminum?

How do I join two pieces of aluminum parts?

• I have two pieces of aluminum parts (like long cylinders) with elliptical cross sections (diameters 60mm and 500mm). I need to join them. Im afraid welding might mess up the surface of the parts where they join (its important for me to have them joined as smoothly as possible). what other options do i have..for example ive heard of dowels but dont know how to use them ..do i drill two holes on each part and just insert the dowels? any other suggestions are appreciated

• Answer:

  Utilize a V-shaped holder to support the two elliptical pieces and then align and secure them. The best joining method is to butt weld them with a gap equal to the thickness. Use a file or coarse abrasive paper to remove the weld bead. Smooth with fine grit paper.