PDO Interview Questians
Name: ANEEZ
2009
WRI 3rd batch
1) Prev Previo iou us work ork exp experie erien nce? ce? 2) What What is sens sensit itiz izat atio ion? n? Caus Causes es and and reme remedi dies es?? 3) What is is so sour se service? 4) How How wil willl ou ou chec check k har hardn dnes esss val value ues? s? !) What What is "#1$ "#1$% % &r &r#'? #'? Wha Whatt is is its its P (o (o ? %) What What is H*C? *C? Cau Cause sess +or +or H*C H*C?? ,) What What is hdr hdroo-en en em.r em.rit ittl tlem emen ent? t? /) 0i++ 0i++ere erenc ncee .w .w H*C H*C and and Hdr Hdroo-en en em. em.ri ritt ttle leme ment nt?? ) wo sampl samplee pieces pieces + destru destructiv ctivee testin testin- id id shown shown *denti+ *denti+ the the test test carried carried out? out? 1$) What do do ou mean mean . ductili ductilit t and .rittle .rittleness ness?? What What is neckinneckin- in tensi tensile le testin-? testin-? 11) 11) How are electrode electrodess classi+ classi+ied? ied? Properties Properties and applicati application? on? 12) 'akin'akin- and and storastora-ee temper temperature ature +or 5ow Hdro-en Hdro-en electrode electrodes? s? 13) 0id ou heard heard a.out a.out hi-h hi-h hdro hdro-en -en electr electrode odes? s? 14) What does does 617 617 stands stands +or +or in 8#%$1$ 8#%$1$?? Which Which positi position on can u weld weld in 627? 627? 1!) Can we use use cellu cellulosi losicc electro electrode de +or +or 9illet 9illet weldin-? weldin-? Wh? 1%) Wh cellul cellulos osic ic electr electrode odess +or +or roots? roots? 1,) What is an *P? :truct :tructure ure o+ o+ *P? What is hold hold and and witness witness point? point? 1/) What do ou ou mean mean . car.on car.on steel? steel? What i+ car.on car.on ; -oes -oes .eond .eond 2 ;? 1) What What is 0::< 0::< "::< "::< and 9::? 9::? 0i++er 0i++erenc encee .w them? them? Prope Properti rties? es? 2$) 2$) What What is is ::C ::C and and pitt pittin in- corr corros osio ion? n? 21) 21) Can Can we do do PWH PWH in sta stain inle less ss ste steel el?? 22) What What do u mean mean . kill killed ed and and semi semi kill killed ed stee steel? l? 23) wo P=> one one with &" &"W @uali+ied @uali+ied +or / mm thickne thickness ss and other other with :A"W :A"W +or 1% mm thickness What are the thickness ran-es @uali+ied +or .oth o+ them? *s it possi.le to make a WP: in com.ination process to weld a 32 mm thk pipe? 24) What What are the the mini minimum mum mand mandato ator r docum document entss +or a P=>? P=>? 2!) " P=> P=> is @uali+ied @uali+ied in in !#- !#- *s it possi possi.le .le to to weld in another another position positionss as per per "P* "P* #11$4? #11$4? 2%) "cceptanc "cceptancee criteria criteria +or 5ack 5ack o+ penetra penetration tion as as per 11$4? 11$4? How How it occurs occurs and how how it can .e .e avoided? avoided? 2,) What do ou ou check check in an an > > +ilm +ilm .e+ore .e+ore interpret interpretation ation?? 2/) What are the the densit densit ran-es ran-es as per ":A8 :ec B< :P 11,%? 11,%? 2) hree di++ere di++erent nt 0ensit 0ensit values values o.tained o.tained in a > > +ilm like like 2! at penetrame penetrameter ter<< 2 and 32 di++eren di++erentt location o+ weld area? 0o ou accept this? Wh? 3$) "ccept "cceptan ance ce crite criteria ria +or +or roun rounded ded indi indicat cation ion?? 31) 31) How How can can we chec check k lam lamin inat atio ion? n? 32) 32) What What is dead dead zone zone in D? D? 33) What What method method -ive -ivess .etter .etter resu results lts 0P 0P or AP*? AP*? Wh? Wh? 34) 34) How How is is cali cali.r .rat atio ion n o+ o+ oke oke done done?? 3!) 3!) Chec Checkl klis istt +or +or atte attend ndin in- repa repair ir??
Name: RAJAEKARAN RAJAEKARAN
WRI 3 rd batch
`Page 1 of 8
PDO Interview Questians
1) 2) 3) 4) !) %) ,) /) ) 1$) 11) 12) 13) 14) 1!) 1!) 1%) 1,) 1,) 1/) 1) 2$) 21) 21) 22) 22) 23) 24) 2!) 2!) 2%) 2,) 2/) 2/) 2)
2009
P>8 P>8B*E B*ED: 8FP 8FP8> 8>*8 *8( (C8? C8? What What is " 1$% &r#.< &r#.< " 333 -r#%< -r#%< 1$! 1$! (< (< "234 "234?? What is P:5? What is F 42< F %$? What What is is 'aki 'akinn- Even Even temp tempera eratur turee and and time time?? What What is holdin holdin- oven oven and and @uiver @uiver temper temperatu ature? re? :our :our and and non non sour sour serv servic ice? e? >e@u >e@uir irem emen entt o+ sour sour serv servic icee mater materia ials ls?? What What is 8#%$ 8#%$1$ 1$<< 8 ,$1$ ,$1$#P #P1? 1? Classi+ica Classi+ication tion and proper properties ties o+ electro electrodes? des? Wh .akin.akin- is carr carried ied out? out? 8ssential 8ssential<< non essential essential and supplem supplementar entar essent essential ial varia.le? varia.le? Procedure @uali+ied @uali+ied ran-es +or thickness thickness in !mm< 1$ mm and 1% mm#*mpact tested materials? materials? What is di++erenc di++erencee .etween .etween t and ? in ":A8 :ec *F? *F? What What is is toutou-hn hnes ess? s? 9errite< 9errite< austenit austenitee and martensit martensite? e? 5EP 5EP as as per per "P* "P* 11$ 11$4? 4? Porosit Porosit accepta acceptance nce criteria criteria as as per ' 313? 313? :P 11,3? 11,3? What What is .rittl .rittlee +ract +racture ure?? 0i++erence 0i++erence .etwee .etween n .reakin.reakin- -lass -lass and tensile tensile specimen specimen?? What What is dens densit it? ? What What is sen sensi siti tivi vit t?? What do do ou check check in in +ilm +ilm .e+ore .e+ore interpre interpretatio tation? n? What are de+ect de+ectss ou seen in "P* 11$4? 11$4? 9ilm 9ilm inter interpr pret etat atio ion n 0esi-n 0esi-n temperatu temperature re o+ 1$% &r#.? &r#.? can can it .e used used at #2$G #2$G C? 0esi-n 0esi-n temp tempera eratur turee at " 1$! (? (? What What is is '#3 '#31 13? 3? What What is :P#1 :P#11,3< 1,3< 11,4< 11,4< 11,, 11,,??
Name: JAY JAYARAM TK
WRI 3 rd batch
1) 2) 3) 4) !) %)
Previous experie rience? Whic Which h is is mor moree duc ducti tile le?? :: :: or or C:? C:? Wh? Wh? Which Which is more more duct ductile ile ":: or or 9::? Wh? Wh? Which Which can can .e weld welded ed more more easil easil? ? Wh Wh?? 0e+ine 0e+ine toutou-hne hness? ss? Which Which is havi havinn- more more tou-h tou-hnes ness? s? ":: or 9::? 9::? Wh? Wh? :tru :truct ctur ures es +or +orme med d in +as +astt cool coolin in- and and slow slow coo cooli linn-?? What What is is .ain .ainite ite?? Whi Which ch is havinhavin- -ood -ood toutou-hne hness? ss? Wh? Wh? `Page 2 of 8
PDO Interview Questians
,) /) ) 1$) 11) 12) 13) 13) 14) 1!) 1!) 1%) 1,) 1,) 1/) 1) 1) 2$) 21) 22) 22) 23) 24) 2!) 2%) 2,) 2/) 2) 3$) 31) 31) 32) 33) 34) 3!) 3%) 3,) 3/) 3/) 3) 4$) 41) 42) 42) 43) 43)
2009
0e+ine hardness? Whic Which h is is hav havin in- -oo -ood d har hardn dnes ess? s? :: or or C:? C:? What is duplex ::? What What will will happ happen en i+ i+ :: and and 0:: stored stored to-eth to-ether? er? pe pe o+ ele elect ctro rode de and and exp expla lain in?? Which Which elect electrod rodee used used +or +ille +illett weldin weldin- as per :P? :P? Wh? Wh? pe pe o+ 5ow 5ow hdr hdroo-en en elec electr trod odes es?? Can :: .e .e used used in in 5ow 5ow temper temperatu atures res?? Wh? Wh? What What is :"W? :"W? 8xpl 8xplai ain? n? 0e+ine 0e+ine Heat Heat rea reatme tment? nt? pe pe o+ o+ heat heat treatm treatment ent?? What What is ann anneal ealinin-? 0i++er 0i++erenc encee .etwe .etween en En#p En#plot lot and E++ E++ Plot? Plot? What What is is cla class ss #1< #1< 2 I 3 pipe pipeli line ne?? Which Which C: C: used used +or +or 5ow 5ow tempe temperat rature ure applic applicati ation? on? What What .asi .asiss low low temper temperatu ature re is de+ine de+ined? d? 0e+ec e+ects ts seen een in in Cs? Cs? How 5E 5E9 oc occurs? Causes Causes +or Dnderc Dndercut ut<< .urnt .urnthro hrou-h u-h < sla-? sla-? "ccept "cceptan ance ce +oe +oe poro porosi sit t as as per per :P 11,,? 1,,? *n 4 mm thic thick k pipe pipe 3 mm poro porosi sit t is o.se o.serve rved? d? 0o ou ou accep accept? t? How materi materials als are clas classi+ si+ies ies as per per "P* 11$4 11$4?? *+ a weld welder er is is @uali @uali+ie +ied d in F 42< can can he weld weld F !2? !2? *+ @uali+ @uali+ied ied in F %$< %$< can he weld weld F !2? Proced Procedure ure @ual @uali+i i+icat cation ion ranran-ee as per :ec :ec *F? /< /< 1% mm thick thick What What will will ou ou che check ck in an AC? AC? >esponsi. >esponsi.ilit ilit o+ weldin weldin- *nspecto *nspectorr .e+ore .e+ore durindurin- and a+ter a+ter weldin-? weldin-? Hardness Hardness value value +or +or sour sour and and non sour service#: service#:P P 11,3? 11,3? *+ a welder welder welds welds a Joint Joint with non @uali+i @uali+ied ed electrod electrode< e< what what will .e our our action? action? How tun-st tun-sten en inclu inclusi sions ons app appear ear in in > > +ilm? +ilm? 9ormul 9ormulaa +or +or densit densit? ? -eom -eometr etric ic unsh unsharp arpnes ness? s? What is is shim? :ens :ensit itiv ivit it +or +ormu mula la?? 0ead zone? What What disc discont ontinu inuit it ou check check usin usin- D? D? Wh lamina laminatio tion n cann cannot ot .e seen seen in in >? >? What What pre preca caut utio ion n u tak takee in P in ::? ::? What What hap happe pens ns i+ i+ sulp sulphu hurr incr increa ease ses? s?
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PDO Interview Questians
Name: Harish Rajendran
2009
WRI 3 rd batch
1) 2) 3) 4) !) %) ,) /) ) 1$) 1$)
Previous experie rience? *nte *ntern rnat atio iona nall code codess and and stan standa dard rdss +ami +amili liar ar wit with? h? What is " 1$!? What What do ou ou know know a.out a.out pipi pipinn- clas classs K"(:*) K"(:*) ? What What does does "(:* "(:* 3$$ 3$$ means means?? What What are are oth other er "(:* "(:* cla class sses es in in pip pipin in-? -? 0i++ 0i++er eren ence ce .et .etwe ween en "(:* "(:* 3$$ 3$$ and and %$$? %$$? What is is se severe +l +luid? What What is di+ di++er +erenc encee .etwe .etween en "(:* "(:* %$$ Kwater Kwater)) and "(:* "(:* %$$ %$$ Koil) Koil)?? How How +lu +luid idss are are cla class ssi+ i+ie ied d as as per per ":A8 ":A8 ' 31 313? 3? What What is Cate Cate-o -or r A +lu +luid id?? `Page 4 of 8
PDO Interview Questians
11) 12) 12) 13) 14) 1!) 1%) 1,) 1/) 1) 2$) 21) 22) 22) 23) 24) 2!) 2%) 2,) 2/) 2) 3$) 31) 32) 32) 33) 34) 3!) 3%) 3,) 3/) 3/) 3) 3) 4$) 41) 42) 43) 44) 44) 4!) 4%) 4,) 4/) 4/) 4) !$) !$) !1) !2) !3) !4)
2009
What What is servi service ce cond conditi ition on +or +or cate-o cate-or r 0 +luid +luids? s? 8xam 8xampl ples es o+ non non tox toxic ic +lu +luid ids? s? 8xampl 8xamples es o+ o+ non toxic toxic and and non non +lamm +lamma.l a.lee +luid? +luid? 0i++er 0i++erenc encee .w .w marten martensit sitee and and .ainit .ainite? e? What What is is pearli pearlite< te< +errit +errite< e< auste austeni nite? te? What What is phase phase tran trans+o s+orma rmatio tion n o+ " 1$!< 1$!< 1$%< 1$%< &r &r '? "s car.o car.on n increa increases ses what what happ happen en to pear pearlit litee phase? phase? What What is di+ di++er +erenc encee .w .w " 333 333 and and " 1$%? 1$%? 0esi-n 0esi-n temepe temeperat rature ure o+ " 1$%< 1$%< " 333? 333? *s impac impactt test test re@ui re@uired red +or +or " 1$%< 1$%< " 333? 333? How can we incre increase ase impact impact proper propert? t? 0e+in e+inee tou tou-h -hn ness? ss? What do ou ou think think is the the reason reason .ehind .ehind itanic itanic +ailure? +ailure? What What is crs crstal tal struct structure ure o+ duct ductile ile mate materia rial? l? "dvant "dvanta-e a-ess and disa disadva dvant nta-e a-ess o+ :A"W :A"W and :"W? :"W? Which Which proces processs can can lead lead to to more more de+ect de+ects? s? 0e+ect normall seen seen in :A"W :A"W not in &" &"W< in &" &"W .ut not in :A"W? :A"W? How man man tpe tpess o+ o+ elec electro trode de are there? there? Which Which elec electro trode de -ive -ivess more more hdro hdro-en -en in weld weld?? What What do do ou ou mean mean . . cell cellulo ulosic sic +i.res +i.res?? Which Which elec electro trode de -ive -ivess deepe deeperr pene penetra tratio tion? n? Whic Which h elec electr trod odee -ive -ivess smoo smooth th arc? arc? Which -as protects protects molte molten n pool +rom +rom atmospher atmospheric ic contamin contaminant ant in cellul cellulosic osic electro electrodes? des? What is downhill downhill weldinweldin- and what electrodes electrodes are used? used? What is is +l +lux? What What are test testss re@ui re@uired red +or +or sour sour servi service ce mater material ials? s? 0e+ect 0e+ectss in in weld weldinin-?? Cause Causess and and remed remedies ies?? Wh Wh spat spatte terr can can .e rem remov oved ed eas easil il? ? What What hap happe pens ns whe when n we use use lon lon-e -err arc? arc? 8xplai 8xplain n di++e di++eren rentt tpes tpes o+ crack crackinin- in weld weld?? What What -ase -asess caus causes es cracks cracks in weldme weldment? nt? What What is solid solidi+i i+icat cation ion crac crackin kin-? -? How How can we prev prevent ent it? it? What What are the the cause causess o+ hdro hdro-en -en indu induced ced crac cracki kin-? n-? What What is lame lamell llar ar tear tearin in-? -? What What is is thro throu-h u-h thick thickne ness ss ductil ductilit it?? How can we we reduce reduce restra restraint int or lamel lamellar lar tear tearinin-?? What What is rehea reheatt cracki crackin-? n-? *n what what mater material ialss it occu occurs? rs? What What tpe tpe o+ crac crack k occ occur urss in in ::? ::? What What is +ati-u +ati-ue? e? What What materi materials als it it -enera -enerall ll occurs? occurs? What What is is str stres esss con conce cent ntra rati tion on?? Wh +ati +ati-ue -ue crac crack k occur occur in outs outside ide sur+ sur+ace ace o+ o+ materia materials? ls? How do do ou ou know know notch notch tou-h tou-hness ness is re@uire re@uired d +or +or a particu particular lar materia material? l? &ive &ive example exampless o+ supple supplemen mentar tar essent essential ial varia varia.le .le?? =uali+ied =uali+ied thickness thickness ran-es ran-es +or +or *mpact *mpact tested tested materials materials## ! mm< mm< 14 mm< mm< 2! mm?
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PDO Interview Questians
Name: Anto dal
2009
WRI 3 rd batch
!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!
1) What are the the material materialss ou +amiliar +amiliar with? 2) What What is mean mean . "333 and and its its desi-n desi-n temp temp ? 3) What What is mean mean . impa impact ct prop propert ert? ? 4) Can we use C: at at #! #! de-? de-? Wh? Wh? !) Chemic Chemical al compos composit ition ion o+ C: I 5C: %) What What is is mean mean . . "1$! "1$! ,) What What is is mean mean . . :: I tpe tpes? s? /) ;o+ alloi alloinn- eleme elements nts in 0:: ) pes pes o+ ele elect ctro rode des? s? 1$) Wh Wh the the clas classi si+i +ied ed lik likee that that?? 11) What is mean . cellulosic< cellulosic< rutile and low hdro-en? 12) pes o+ coverin- +or each and chemical composition? composition? 13) Which o+ these three -ive -ive -ood arcL make more sla-< +umes etcM 14) Wh low hdro-en electrodes need .akin- and how< how< temp etcM 1!) Which one is used +or pipeline? pipeline? Wh? 1%) Weldin- process ou +amiliar with 1,) "dvanta-es "dvanta-es and disadvanta-e disadvanta-e `Page 6 of 8
PDO Interview Questians
2009
1/) "pplicatio "pplication? n? Wh? 1) Which one -ives -ood impact impact propert? 2$) What are ou know know a.out heat treatment? treatment? 21) pes o+ H 22) Phase trans+orm trans+ormatio ation n in H? 23) Aaterial structure in C:etc ? 24) "usteniteMMtoMMMM "usteniteMMtoMMMMM.inate? M.inate? 2!) Aaterial structure structure in .inate? 2%) >immed< Nilled< :emi :emi killed steels? steels? 2,) What are essential non< supplementar supplementar essential varia.les? 2/) How a supplementar essential varia.le .e essential? 2) How we know it a++ect a++ect the notch tou-hness? 3$) wo P=> we have one with &" &"W in / mm and another with 1% mm :A"W :A"W Can we make a WP: with these two +or 32 mm com.ination process? Wh? 31) With &" &"W 14mm? Wh? 32) hickness ran-e o+ impact propert materials 24mm< 14mm< 1$mm< 4mm 4mm 33) What are the classes ou know in materials? speciall speciall in :: 34) What are the acceptance criteria o+ porosit as per '313OK0i++erent '313OK0i++erent service and thickness) 3!) What are the acceptance criteria o+ porosit< porosit< sla-< 5EP< *P etc as per "P* 11$4 3%) 0i++erent techni@ues in in > > 3,) Which side *=* *=* -ives -ood ima-e? Wh? 3/) :ensitivi :ensitivit???? t???? 3) What are the thin-s ou check in in interpretation? 4$) 'ackscatter 'ackscatter??? ??? 41) 0W0*???? 0W0*???? 42) What is the main point point ou check in elliptical method? method? 43) What does u know a.out a.out D???? D???? 44) !mm thick plates which process ou pre+er P or A? Wh? Wh? 4!) How ou check check oke? 4%) What is the an-le o+ oke? How is it works? works? 4,) A detect de+ect up to how much depth? 4/) What is mean . dwell time? how much ? 4) Can we use A in ::? Wh? !$) *n +errite?? +errite?? !1) Which tpe o+ penitrent we use in :: +or P? !2) HEW we will will check? !3) *nterpretation with with +ilm photosM
2nd appearance 1) How man +ilms u interpreted et now? 2) What r the common de+ects? 3) "cceptance criteria +or that ones ones without re+errin- code? 4) "cceptance criteria o+ porosit? !) What r the specs u +amiliar with `Page 7 of 8
PDO Interview Questians
%) ,) /) ) 1$) 11) 12) 13) 14) 1!) 1%) 1,) 1/) 1) 2$) 21) ""# 23) ")# 2!) 2%) 27) 28)
2009
"cceptance criteria o+ porosit< porosit< sla-< root concavit? :ame in di++erent thickness< cods< specs specs ect? What is meant . porosit? Which -as is trapped in porosit? Causes o+ porosit? What is mean . electrode .akin-? emperature? emperature? >easons? Holdin- times in .ackin- oven< holdin- oven< @uivers? Causes o+ root concavit? What will happen due to root concavit? How we select the shots +or radio-raph? 0i++erent techni@ues? 9amiliar with? :hot selection o+ dou.le wall sin-le ima-e? What is meant . densit? Aaximum densit allowed? Aaximum densit variation allowed? What is meant . D&? 8@uation and explain? Ho$ % select the si&e o' so%rce(
What is the re@uired D& no? I' the 'ilm is *+mm a$a 'rom the $eld, Ho$ % calc%late -.(
0o u know a.out *P? 9or radio-raph what is *P sain-? How u know radiography has taken? Film interpretaon.. interpretaon..
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