uji lengkung ( bending test ) (material)

4/16/2015 UJIBAHAN:UJILENGKUNG(BENDINGTEST)|rikisanjaya.InspectorOil&Gas.

http://navaleengineering.blogspot.com/2012/04/ujibahanujilengkungbendingtest.html 1/6

Saturday,14April2012

UJIBAHAN:UJILENGKUNG(BENDINGTEST)

>DASARTEORI.

Uji lengkung (bending test) merupakan salah satu bentuk pengujian untukmenentukanmutusuatumaterialsecaravisual.Selainituujibendingdigunakanuntuk mengukur kekuatan material akibat pembebanan dan kekenyalan hasilsambungan las baik diweldmetalmaupunHAZ.Dalampemberianbebandanpenentuandimensimandreladabeberapafactoryangharusdiperhatikan,yaitu:1.Kekuatantarik(TensileStrength)2.KomposisikimiadanstrukturmikroterutamakandunganMndanC.3.Teganganluluh(yield).

Berdasarkanposisipengambilanspesimen,ujibendingdibedakanmenjadi2yaitutransversalbendingdanlongitudinalbending.

5.1.1.TransversalBending.Padatransversalbendingini,pengambilanspesimentegaklurusdenganarah

pengelasan. Berdasarkan arah pembebanan dan lokasi pengamatan, pengujiantransversalbendingdibagimenjaditiga:

a.FaceBend(Bendingpadapermukaanlas)Dikatakan Face Bend jika bending dilakukan sehingga permukaan las

mengalami tegangan tarikdandasar lasmengalami tegangan tekan (gambar5.1). Pengamatan dilakukan pada permukaan las yangmengalami tegangantarik.Apakahtimbulretakatautidak.Jikatimbulretakdimanakahletaknya,apakahdiweldmetal,HAZataudi fussion line (garisperbatasanWMdanHAZ).

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Gambar5.1FaceBendpadatransversalBending

b.RootBend(Bendingpadaakarlas)DikatakanRoteBendjikabendingdilakukansehinggaakarlasmengalamitegangan tarik dan dasar las mengalami tegangan tekan (gambar 5.2).Pengamatandilakukanpadaakarlasyangmengalamitegangantarik,apakahtimbulretakatautidak.Jikatimbulretakdimanakahletaknya,apakahdiweldmetal.HAZataudifusionline(garisperbatasanWMdanHAZ)

Gambar5.2RootBendpadatransversalBending

c.SideBend(Bendingpadasisilas).Dikatakan Side Bend jika bending dilakukan sehingga sisi las (gambar

5.3).Pengujian inidilakukan jikaketebalanmaterial yangdi las lebihbesardari 3/8 inchi. Pengamatan dilakukan pada sisi las tersebut, apakah timbulretakatautidak.Jikatimbulretakdimanakahletaknya,apakahdiWeldmetal,HAZataudifusionline(garisperbatasanWMdanHAZ).

Gambar5.3SideBendpadatransversalBending5.1.2.LongitudinalBending

Padalongitudinalbendingini,pengambilanspesimensearahdenganarahpengelasanberdasarkanarahpembebanandan lokasipengamatan,pengujianlongitudinalbendingdibagimenjadidua:FaceBend(Bendingpadapermukaanlas)

Dikatakan Face Bend jika bending dilakukan sehingga permukaan lasmengalami tegangan tarikdandasar lasmengalami tegangan tekan (gambar5.4). Pengamatan dilakukan pada permukaan las yangmengalami tegangantarik,apakahtimbulretakatautidak.Jikatimbulretakdimanakahletaknya,apakah diWeldmetal, HAZ atau di fusion line (garis perbatasanWM danHAZ).

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Gambar5.4FaceBendpadalongitudinalBending

RootBend(Bendingpadaakarlas)DikatakanRootBendjikabendingdilakukansehinggaakarlasmengalami

tegangan tarik dan dasar las mengalami tegangan tekan (gambar 5.5).Pengamatandilakukanpadaakarlasyangmengalamitegangantarik,apakahtimbul retak atau tidak. Jika timbul retak di manakah letaknya, apakah diWeldmetal,HAZataudifusionline(garisperbatasanWMdanHAZ).

Gambar5.5RootBandpadalongitudinalBending

5.2.Kriteriakelulusanujibending Untukdapat lulusdariujibendingmakahasilpengujianharusmemenuhi

standardASMEsebagaiberikut:1.PadadaerahWeldmetaldanHAZukurannyatidakmelebihi1/8inchi(3,2

mm)yangdiukurdarisegalaarahpemukaan.2.Padadaerahpelapisanukurancacatmaksimal1.6mm3. Cacat pada sudut diabaikan kecuiali akibat SI (Slag Inclusin) dan IF

(IncomplateFusion)danInternalDiscontinuties5.3.Material

Spesimenujibendinguntukfacetransversalbend(1buah)Spesimenujibendinguntukroottransversalbend(1buah)Batugerendakasar(1buah)Batugerendahalus(1buah)

5.4.Peralatan1.MesinUjiBending2.Gerindatangan3.Kacamatapelindung4.Sepidol5.Kabeldaya6.Sarungtanganpelindung7.Jangkasorong

5.5.GambarKerja

a.Luasanyangharusdigerindapadafacetransversalbend

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>RENCANAGARIS(LINESPLAN)I.1.UmumUntukmengetahuibentukdanmengukurbadank...

LATARBELAKANGSISTEMPERPIPAAN,PENGERTIANSISTEMPERPIPAANSISTEMPERPIPAANLATARBELAKANGSISTEMPERPIPAAN,PENGERTIANSISTEMPERPIPAANKitatahubahwaWilayahyangada...

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b.Luasanyangharusdigerindapadaroottransversalbend

Gambar5.6SpesimenujitransversalBending

5.6LangkahKerja1.MenyiapkanSpesimen

Ambilspesimen,gerindapadapermukaanyangakandiamatipadadaerahweld metal, HAZ, dan sedikit base metal. Panjang luasan yang digerindasekitar50mm(gambar5.6)

Gerindasudutsudutspesimensepanjangluasandiatassehinggamenentukanradius.

Dalammenggerinda,pertamakaligerindadenganbatugerindakasarterlebihdahulu,setelahratabarudigerindadenganbatugerindayanghalus.

Ulangilangkahdiatasuntukseluruhspesimen.2.Kodifikasi

Ambilsepidoldantandaitiapspesimendengankodesebagaiberikut:F.untukspesimenfacebendR.untukspesimenrootbend

3.Pengukurandimensi:AmbilspesimenukurdimensinyaCatatkodespesimendandatapengukurannyapadalembarkerjaUlangilangkahdiatasuntukseluruhspesimen.

4. Penentuandiametermandrel

TabelDiameterMandrel

SIUnit

MaterialThicknessofSpesimenmm A B C D

PNo13toPNo.21throughPNo25 P.21 through PNo.25 PNo.23PNo.35 any PNo metalwithPNo.33,36,or37

3.2t=3.2orless

52,416t

26.58t

60,418 t +1,6

30.29+0.8

PNo.11PNo.53PNo.62

9.5t=9.5orless

63.56t

31.83t

85.58t+3.2

42.94t+1.6

PNo.51 9.5t=9.5orless

76.28t

38.14t

98.410t+3.2

49.25t+1.6

PNo.52PNo.53PNo.61PNo.62

9.5t=9.5orless

95.210t

47.65t

117.512t+3.2

58.76t+1.6

Allotherswithgreatherthanor5equalto20%elongation

9.5t=9.5orless

38.14t

19.02t

60.46t+3.2

30.23t+1.6

All others with less than 20 %elongation

t=(seenoteb) 32 tmax

16 tmax

34t+1.6max

17t+0.8max

Berdasarkantablespesimentersebutdiatastentukandiametermandrelyangakandigunakan.

5.PengujianpadamesinpengujianbendingCatatdatamesinpadalembarkerja

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AmbilspesimendanletakkanpadatempatnyasecaratepatSettingbebandanberikanbebansecarakontinyuAmbilspesimendanamatipermukaannya.Bilaterdapatcacat,ukurdancatat

pada lembar kerja bentuk, dimensi, tempat dan jenis cacat. Sketsa jugagambarcacatpadalembarkerja.

Ulangilangkahdiatasuntukseluruhspesimen

StandarddimensipercobaanRootbend

Gambar5.7Spesimenroottransversalbendtampakatasdansamping

Facebend

Gambar5.8Spesimenfacetransversalbendtampakatasdansamping

Diposkanolehrikisanjayadi14:07Label:PENGETESANDIKAPAL,UJIBAHAN

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jojo 19June2013at14:33

izin

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weldingcommunity 27October2013at16:26

izin

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MuhammadAndre 12November2013at16:02

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Anonymous 27February2014at08:01

Izin:)

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Anonymous 19March2014at16:07

ma'afnumpangtanya...untukstandarASMEitusumbernyadarimana....??apakahadabukunya....??

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uji lengkung ( bending test ) (material)

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