Hi. Ive been looking all over for 4 diffrent weldings symbols. In my welding class I was given the task of looking and compiling the last four that nobody could find. I'm in high school and in all of the text books we could not find these 4 symbols. If anyone could help it would be a a big help. The four welding symbols are O.A.C. ( Oxyacetylene Cutting), P.A.C. ( Plasma Arc Cutting), C.A.C. - A ( Carbon Arc Cutting - Air [thats what he told me to look for]). So if anyone could help it would be a great help. Thanks again.