DMWR-9-2815-220
AVDS-1790 ENGINE OVERHAUL STANDARD
DEPOT MAINTENANCE WORK REQUIREMENT
DMWR-9-2815-220 - Page 120 of 1422
5-7.
Welding
NOTE
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DMR 9·2815±220
the Informa½Io¾ presen½ed below Is based on ½he aPplicabLe ParagraPhs In
M¿À-WÁ8604 and M¿Â-Ã-ÄÅ2Æ5
and ou½lIne Çhe reqUIReÈÉnÇs, eQuIPÊnÇË and
Ìeld;g Process Îsed for rePaIr oF aÏUÐIÑuÒ aÓLoy cas½IngsÔ
HfL-
sr-².
aÕ
OÖera½or.
Weld;g shall be pe
×
orÐed By weÓdI¾g opera½ors who have sUccessØ
FUÏly ÐeÇ ½He reQUireme¾½s of
W
,
For MaÇerIaÏ GroÎP
IV
{AlUmInuÒ AÏloys)Ù
OPeraÇIo¾aÏ:
TM 9-237 (Úov. 1967).
the base maÇerIaÛÜcovered Ín ÇhÍs Procedure
ÝÞyPe 355-T7ß àederal SPecIfIcaÇIon áâ-Aãäå
<.A±
/
,µD
²p³ 34´T'µ ¶1h·7¸
M{
S9¹
º r» B td
¼
b.
æçuIPè¾½é
An aϽerÑa½I¾g cUrren½ arc weldI¾g êchÍne shaÏl be Used For
¸
heÏÍarc wëìDngí
Class ÄÆÄ3, co¾forÒing Çoî
weldÍng rodï
Is coÒPaÇIble wIÇh Çhe base maÇerÍal and shall Be used
or all weLdIng rePaIrs In
ÇhIs Ða½erÍal groUPÙ
AlÛ eQUIPðn½ shall Be consIsÇe¾½
I½h good sÇandard weldIng
PracÇIces, and be accep½aBle ½o ½he Gover¾Ðe¾Ç ñ¾spec½oòó
c.
ôrocesses.
(1)
õ¿G
MeÇaÏ ¿¾er½ Gas
Ing aluÒInuÐ pla½e grea½er Çhan
aw½
4³´/µ
the õöG Process Ís reco÷øended when weldù
½hIck¾ess.
(2)
t¿G úÞU¾ûs½eÑ üÑerÇ Gasý þrocess.
Whe¾ weÏdIng alumInuÐ plaÇe
ÿ/8 ;ch
½hIcK aÑd u¾derĀ ½he āüG Process Is reco÷Ăndedí
dă
Cas½I¾Ą ąreÖara½IoĆ.
(1) ćÛeaÑÍnĈí
All foreIg¾ ma½erÍal ÒUsÇ Be removed Froĉ Çhe area ½o Be welded
PrIor ½o repaIr oPeraÇions. the area shaÏÓ be clea¾ed UsIng a sÇaInÓess sÇeeÏ wIre
brUshĊ driÏlĊ burrI¾g ÇooÓĊ or apProved cheÒIcal ProcessĊ whIchever Is aPplIcableÙ
(2)
CracKsÙ
ċÇeČi¾e fÏow oF cracKs by UsI¾g dye checK ÒeÇhod.
črIÛÏ s½op
hoÏes a½ cracK eÑds ÌI½h a ß/Ä I¾ch driÏÏ and mÍlÏ oU½ cracKs ½o provIde a
V
aPÉrÇUre.
Ď
(3)
ďrac½ÎresÔ
Check area arou¾d ½he fracÇure for cracks usÍng dye checkÔ
črIÏÏ sÇoP holes a½ ½he end
s
·
oF deÇec½ed cracKs wi½h a Đ/Ä Inch drIÏÏ a¾d ÒÍll oU½
crack ½o ProvIde a
v
aPer½Ure.
-±-
(4)
MIssI¾đ meÇal.Ē
f
Çhe sIēe
Ĕ
oĕĖ Çėe ĘęĚgeděarea
Ĝ
ĝ
Ğ
e
ğ
ĠIġs
Ċ
mIÛÛ ouÇ a¾d
chĢmfer Çha½ area Ço 30 degrees Ço provide a 60 degree InclUded angÏe.
the inser½
PIÉce reQUIRed for ½hÍs aģea Òus½ Be Ide¾½ÍcaÏ Ín coÒposÍÇIon
a¾d Òay be cU½ froÒ
scĤaPPed casÇi¾gs or sui½aBle shee½ sÇock.
ài½ I¾serÇ pIece IĥÇo ÒIÏled areaĀ so
Çha½ Ħ/6 ½o ħ/8ĨInch Is ĩIÑÇained Be½wee¾ Ínser½ and casÇIng wall.
¹
eé
ĪreąarÇÍon
For ÌeÏdiÑĈÔ
ĪrecIsely ÒeasUre casÇIngs aÇ aPproPrīa½e loca½Ions
Ço
de½ecÇ dÍè¾sIo¾aÏ chaĬges caUsed by weld;g rePaīrÙ
ĭecord dÍÐe¾sIons for
chÉcKÍng aFÇer rePaIr has
bee¾ Èade Ço Įe sUre ½ha½ crͽÍcaÏ dIÒensÍons have bee¾
held.
fí
ôrehea½ Örior ½o weÏdI¾Ĉí
ôrehea½ casÇi¾gs as ouÇÏIned I¾ âá-A-601 a¾d
m¶¸6
Īreįea½ sÓoÌÛy ÍÑ an oveÑ or By oÇher sUͽaBÏe ݽhod For ½wo hoÎrs ½o
¹'
Fl_ sm
_
¾ ¿
Å/ĦÆ
)
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