A388/A388M -19 Standard Practice for Ultrasonic Examination of Steel Forgings

Designation: A388/A388M -19 Standard Practice for Ultrasonic Examination of Steel Forgings1 1. Scope@ 1.1 This practice2 covers the examination procedures for thecontact. pullsc-ccho ultrasonic examination of stcel forgings bythe straight and angle-beam techniques.The straight beamtechniques include utilization of the DGS (Distance Gain-Size)method. See Appendix X3. 1.2 This practice is to be used whenever the inquiry.contract,order,or spccification states that forgings are to besubject to ultrasonic examination in accordance with PracticeA388/A388M. 1.3 Supplementary requirements of an optional nature areprovided for use at the option of the purchaser.The supple-mentary requirements shall apply only when specified indi-vidually by the purchaser in the purchase order or contract. 1.4 The values stated in either Sl units or inch-pound unitsare to be regarded separately as standard. The values stated ineach system may not be exact equivalents; therefore.eachsystem shall be used independently of the other. Combiningvalues from the two systems may result in non-conformancewith the standard. 1.5This specification and the applicable material specifica-tions are expressed in both inch-pound units and Sl units.However，unless the order specifies the applicable"M" speci-fication designation [Sl units], the material shall be furnishedto inch-pound units. 1.6This standard does nor purporr to address all of thesafery concerns.if any. associated winh iss use. I is rhere spovsibility of the user of this standard to establish appro-priete scafety，healrha, cand erivironnewtal practices and deter-ersine rhe applicabiliry of reglatory liniratiors prior to use. 1.7 This inrernational srandard was developed in accor-cance with inferniationally recognized principles ow standard-ization established in the Decisiow on Principles for the