.emmm.. thank for the opinion, i'm not experts in weld coz not more enough experience in weld. still in learn and to know about welding. i have PCN level 2 in welding inspector,from BINDT but more involve in inservice inspection for UPV boilers and others...oh..for TOFD, i'm trying to ask my friend,how the method.he ASNT level 3 in all method.