1、STD-AECMA PREN 4050-4-ENGL L77b 1OL23LL 001214b T73 H Edition approved for publication AECMA STANDARD NORME AECMA AECMA NORM C5 Chairman Comments should be sent within six months after the date of publication to prEN 4050-4 Edition P 1 January 1996 PUBLISHED BY THE EUROPEAN ASSOCIATION OF AEROSPACE
2、INDUSTRIES (AECMA) Gulledelle 94 - B-1200 BRUXELLES - Tel. (32) 2 775 81 1 O - Fax. (32) 2 775 81 1 1 ICs : Descriptors : ENGLISH VERSION Aerospace series Test method for metallic materials Ultrasonic inspection of bars, plates, forging stock and forgings Part 4 : Acceptance criteria Srie arospatial
3、e Luft- und Raumfahrt Mthode dessai applicable Prfverfahren fr aux matriaux mtalliques metallische Werkstoffe Contrle par ultrasons de barres, plaques, demi-produit pour forgeage et pices forges Partie 4 : Critres dacceptation Ultraschallprfung von Stangen, Platten, Schmiedevormaterial und Schmiedes
4、tcken Teil 4 : Abnahmekriterien This “Aerospace Series“ Prestandard has been drawn up under the responsibility of AECMA (The European Association of Aerospace Industries). It is published on green paper for the needs of AECMA-Members. It has been technically approved by the experts of the concerned
5、Technical Committee following comment by the Member countries. Subsequent to the publication of this Prestandard, the technical content shall not be changed to an extent that interchangeability is affected, physically or functionally, without re-identification of the standard. After examination and
6、signature of the AECMA Standard Checking Centre (NPS) and formal agreement of the Official Services of the Member countries it will be submitted as a draft European Standard to CEN (European Committee for Standardization) for formal vote. 1 996-0 1 -3 1 AECMA Gulledelle 94 B-I 200 BRUXELLES Mr Odori
7、co I I aecma 1996 Page 2 prEN 4050-4 : 1996 Contents list Page Scope 3 Normative references . 3 Acceptance criteria 3 Choice of technique . 4 STD-AECMA PREN q050-q-ENGL 377b 303233L 0032348 Bbb W Maximum multiple discontinuities 2) Maximum single discontinuity, non linear 1) Page 3 prEN 4050-4 1 199
8、6 Single discontinuity linear 1) FBH mm 1 Scope This standard specifies the acceptance criteria for products ultrasonically inspected in accordance with EN 4050-1. 2 Normative references This European Standard incorporates by dated or undated reference provisions from other publications. These norma
9、tive references are cited at the appropriate places in the text and the publications are listed hereafter. For dated references, subsequent amendments to or revisions of any of these publications apply to this European Standard only when incorporated in it by amendment or revision. For undated refer
10、ences the latest edition of the publication referred to applies. EN 4050-1 Aerospace series - Ultrasonic inspection of billets, bars, plates and forgings in steel, titanium, titanium alloys, aluminium alloys and heat resisting alloys - Part 1 : General requirements 1) 3 Acceptance criteria The accep
11、tance criteria, class 1 to 7, are given in table 1. Table 1 : Acceptance criteria Class I FBHmm I mm Response Length The FBH reference value for multiple discontinuities shall be set for the corresponding class in each case. Reject within each particular class : a) Ultrasonic indications shall be no
12、t greater than the value given in table 1 within the corresponding class b) Loss in back wall echo shall be not greater than the value in dB/mm, or % screen height agreed between the manufacturer and purchaser ; ci Noise levels shall be not greater than the monitor threshold level. 1) Published as A
13、ECMA Prestandard at the date of publication of this standard Page 4 prEN 4050-4 : 1996 4 Choice of technique Classes 1, 2, 3, 4, 5 and 6 shall be inspected using either immersion, mechanized contact or manual contact inspection. Classes 5 to 6 shall preferably be inspected by either immersion or mechanized contact. Within class 7, the inspection of sheets and bar for forging or machining shall be carried out using either immersion or mechanized contact. The forged parts shall be inspected using the immersion technique.
