delor,
thank you for the excellent illustrations! it's basically how i pictured the lamination in my mind, and was going to use the google sketchup, but the illustrations you provided are perfect. thanks once again.
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Sandwich is much stronger because the welded surfaces are wider. Weld lines are quite irregular because of the strong hammering for the welding of the whole surface. I believe this is the construction of your blade.
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i think you are spot on on this one. my respect to the pandays of oldjust went up another notch..