標準號：BS M 36-1970
中文標準名稱：以平底孔為參考標準采用浸沒技術的特殊鍛件的超聲波試驗法
英文標準名稱：Method for ultrasonic testing of special forgings by an immersion technique using flat-bottomed holes as a reference standard
標準類型：H26
發布日期：1970/9/14 12:00:00
實施日期：1970/9/14 12:00:00
中國標準分類號：H26
國際標準分類號：49.025.01
適用范圍：1 This British Standard applies to the ultrasonic inspection by an immersion technique of special forgings used primarily for rotating parts, e.g. turbine discs. It accordingly describes the method of testing by which the acceptability of such forgings can be assessed, and specifies flat-bottomed hole reference standards, apparatus re-quirements, and control and test procedures. 2 The method, which is confined to pulse echo tech-niques and the use of single crystal transceiver probes, is limited to use on forgings having a thickness of not less than twice the near surface resolution of the probe (as determined in 2.1.4) which lend themselves, by virtue of their form, to mechanical scanning in which the incident beam is approximately normal to the surface of the section being scanned. 3 The method is primarily intended and recommended for use on forgings when these are in the raw material state only. However, it can be used during manufacture on machined or part-machined components, provided that these components comply with the shape and thickness described in 1.1.2. 4 By agreement, the standard may also be used for tests on other types of forgings and wrought forms manufac-tured in all metallic materials, in which case due allowance has to be made for the differences in ultrasonic attenuation and transmission factors presented by each material. Factors affecting the apparent flaw size when estimated by comparison with the reference standards, and procedures which will enable due allowance to be made for them are described.