I have to weld a fitting on the bottom of a all-clad pot. The pot is stainless steel, with an alluminum layer bonded somehow on the bottom of the pot with another layer of stainless on the bottom sandwhiching the alluminum. Now my question is, is it possible to weld the coupler on the bottom of the pot without the alluminum core becoming a problem when I try to establish a puddle. My guess, its gonna burn back the alluminum, but Im not sure if it will throw porosity into the stainless steel puddle, or cause cracking. Any ideas?