Pattern Welded shotgun barrels can be classified into three general categories, all starting with strips of iron and steel, but with different manufacturing methodology:

Twist - thin ribbons of layered iron and steel which were NOT twisted before being wrapped around the mandril and hammer forged.
http://docs.google.com/Doc?id=dfg2hmx7_40dxk2scc7

Crolle Damascus in many patterns which are determined by how the iron and steel were 'piled' or layered in the billet and the twisting of the rods.
http://docs.google.com/Doc?id=dfg2hmx7_163vgh5prdf
http://docs.google.com/Doc?id=dfg2hmx7_180c83rvwg4

Laminated Steel - a higher ratio of steel to iron mixed together and ‘puddled’ before being formed into rods.
http://docs.google.com/Doc?id=dfg2hmx7_52fs85cfgt

Please look around here: http://www.picturetrail.com/sfx/album/view/20258609

and http://www.picturetrail.com/sfx/album/view/18059733


Last edited by Drew Hause; 07/15/11 07:40 PM.
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