ASTM E138-63 (1976)

Method for Wet Magnetic Particle Inspection (Withdrawn 1981)

General Information

• Status: Withdrawn
• Technical Committee: E07 - Nondestructive Testing
• Drafting Committee: E07.03 - Liquid Penetrant and Magnetic Particle Methods

Standards Content (Sample)

Designation: E 138 - 63 Amorornn Notoonal SI•11UI•u !i 1!1/:l (R 1!10!11
J\ppouvml J ,oto Ill, 1 !1 J J
(Reapproved 1976)
nv 1\lflfiiii;; Ul Noiilllu~• l ~iltlwlull •, ln•.JIIUtt
Standard Method for
1
WET MAGNETIC PARTICLE INSPECTION
Thi' SWnoLml. ts issued nntlcr lhc ti~ctl dc' lhc yc.! r ur Urtllllllll .tolupltun ur, 111 lhc C·l'4: ,,1· r~YI\tun, lhc yc:tr ul' ln'l rc~i,iun 1\ number in pnrcnlhc'c' indicate' I he
year nl l·"t rc.•rpruval.
T ho< 1111'/lwtl lun /,.·~ ·11 tiJIJINJI'<'d lot a l(r'lll'ot'< <~(till' l>o•Jottr/IIW/11 u/ /Jo•/oW•c' m f'llrt ••I lo•tl.-rlll 1i·.>t .lfo•tltud Sttllltlttrtl
·' 11 15/lo 111111/o~ /JW11g tllllw Ou/l I IIIIo 1 11/ \i•o·o 1/ir ,,,;,,. um/ S ttttrtlrol'll.o·,
I. Scope ization (longitudtnal or circulm, over-all or
loca l, etc.),
1.1 This method outlines standardw:d
1.2.4 Magnetizing current or ampere turns
techniques for the wet method or magnetic
to be used fur c.tch shut. and
particle inspection, which will produce satis­
1.2.5 SCl\Uence or operation (continuous or
factory and consistent results and upon which
residual).
acceptance standards may be based. They
All of theo;c techniques cause vari may be applied lo a ll forms of materiul, as­
results and must be standardized if reproduc­
formed and semi-formed as well as the fin­
ible rco;uJto; arc to be obtained upon which
ished state. The method may also be applied
acceptance 'ila ndards arc to be based.
to over-all and preventive maintenance m­
I.J Thi.-. method docs not indicate or sug­
spc~.:t lon .
gest standa rds for evaluation of the indication,,
Ncrn 1- Fo r the dry powder method nl' 111<1~·
obtained. It o;hould he pointed out, however,
netic p.trlicle inspection. reference ~huul~ he m;~dc
to t\S'I M M ethod I; 109, for Dry J>uwdcr MagnetiC that after indic 1
I' article I n~pcctwn. •
they must be interpreted or classified and
Nll'l t: 2 The lcchnitJUe!. described an; general
then evaluated. For this purpose, there must
and do nut specifically cover inspection uf new Hit·
craft P•!rh. l'ur these. more dclllilcd "Jlecilicatillns be a o;cparatc spccilication or a specific agree­
arc :tv:ul:~blc anti arc rccnm mcndcc.J for usc where
ment between those responsible for the in­
applicable. The~c include SAl ·. Acrnnautical Ma·
spection and the purchasers or user:., to define
leri.al ~pccilic;ttinn t\MS 26411-1:. Miltl:try Spccili­
accurately the type, location, and dtrection of
Laltnn M 11.·6KC•K. and Air Force Technical Order
T.O.JJB2·1·1 .
indications considered acceptable, and those
where rework or repair is permitted.
1.2 Because this method 1s applicable to
I .4 The magnetic particles used as the in­
many different types or parts in a wide variety
spection medium for the wet method of in­
ol' sizes and ~hapes and with widely varying
spection are extremely small, being on the
inspection requirements, it includes many
order of a few microns in size. This indicating
variations in technique and procedure. De­
medium is particularly well suited to the de­
lails or procedure should be covered by spc·
tection of extremely line discontinuities ex­
citic product spccifiC'.ttions. Wherever this
tending to the surface such as grinding cracks,
method is referenced in drawings, specifica­
fatigue cracks. The wet method also has the
tions, ur purclwse orders, additional specific
advantage that it is possible to cover more
da ta should he included covering the following
easily and quickly with a film of indicating
items;
material those pieces of irregular size and
1.2.1 Areas to he inspected (entire part or
shape. It is, therefore, particularly well
specific critical location~).
adapted to production inspection uf small and
1.2.2 Magnetizing current to he uM:d (alter­
nating or direct),
• 'llli' IIIClhtKI j, llllllcr the juri!ldict\lln ur ASTM Cum·
1.2.3 Direction of magnetic field. including mince F. 7 uu Nnndc,lruo.:t·vc: Tcsliog.
Current cdtlinn clfcctivc Sept . lO. 191\J. Originally j,.
specific information as to how many shot-; arc
sUcll I 95X. Rcpl:tccs f. 13K ~K T.
to be used and the exact method of magnet- ' .·ltmmtl Hook of ASTM Stot~dortl.r. t•arl II .
266

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E 138
3.1.2.4 By usc of coils which encircle all or
medium-sized parts. With proper equipment,
a section of the pa rt (Fig. 6), t~nd
however, it can also be applied to large pieces.
3.1.2.5 By usc of magnetic yokes or pole
2. Magnetic Particle Inspection
pieces (fig. 7).
If the current is to be pus-;cd through the
2.1 Magnetic particle inspection is a non­
part itscl f, the equipment must provide con­
destructive method for detecting cracks and
tacting or clamping clements with sufficient
other discontinuities surface and clamping pressure to allow the
ferromagnetiC m:11
...