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استاندارد ASTM A388 در خصوص ارزیابی آلتراسونیک بر روی قطعات آهنگری سنگین فولادی به زبان انگلیسی 8 صفحه Standard Practice for Ultrasonic Examination of Heavy Steel Forgings Scope*1.1 This practice2covers the examination procedures for thecontact, pulse-echo ultrasonic examination of heavy steelforgings by the straight and angle-beam techniques. Thestraight beam techniques include utilization of the DGS (Dis-tance Gain-Size) method. See Appendix X3.1.2 This practi ...