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Aramco Specific Evaluations for Welding / Mech. QC candidates

1. Describe the difference beteen QA/QC!

QA provides the ob"ective needed to give a ma#imum confidence for $ualit%hile QC is involved ith the monitoring of a process and eliminating thecauses of an% deficient output ith an% process& hich has effect on $ualit%.

'. What is an essential variable as related to a Weld (rocedure Specification)W(S*!

Essential variables are those in hich a change& is considered to affect themechanical properties of the eldment and shall re$uire re$ualification ofthe W(S.

+. What is the relationship beteen (rocedure Qualification ,ecord )(Q,* anda W(S!

(Q, is a record of the elding data used to eld a test coupon& it containsthe result of the tested specimens& hile the W(S is the ritten form of theelding procedure for ma-ing a specified -ind of eld "oint using specifiedbase and filler materials.

. eat input )SMAW per ASME SEC 0* is a common of hat to electricalcharacteristics 2 travel speed!

3olts and amperes& heat input 4 volts # amperes / travel speed.

5. E#cessive heat input is mainl% attributed to hat poor elding techni$uesduring SMAW process!

0ncorrect elding techni$ue

6. What are + potential sources of %drogen encountered during SMAWprocess!

Damp electrodes

Moist surface

0mproper eather condition.

7. What are several li-el% causes of porosit% in carbon steel elds using theSMAW process!

E#cessive moisture in the flu#

Arc length too long

8se of lo elding current

Damage electrode flu#

9. What dimension is measured to determine the si:e of a concave fillet eld!

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0ts height and length

;. What dimension is measured to determine the si:e of a conve# fillet eld!

0ts throat thic-ness

1?AW process& describe hat happens to a root pass appliedithout purging/bac- gauging on SS!

0t ill produce o#idi:ing& co-ing to the eld metal.

1'. @ame + of the 5 mechanical tests in ASME 0 emplo%ed for procedure

2 performance $ualifications!

?ension test

>uided bend test

illerBeld test

@otchBtoughness test

Macro test

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Mechanical/NDT, assume SMAW process for all questions.

1. o is Magnetic (article inspection of a eld using et continuous testmethod performed!

Measure and record the temperature of e#amination surface&temperature shall not e#ceed 1+5 )57 C *

Clean e#amination surface and ad"acent area ithin + inches ) 76.'mm * of the e#amine area

(erform visual inspection of the e#amination surface for cleanliness

and discontinuities

Chec- for remnant magnetic fields e#ceeding ' gauss.

'. 0ndications ith =i$uid (enetrant ?esting are easil% seen if the surface hasbeen prepared b% grinding prior to testing! ?rue or alse! Wh%!

alse& surface discontinuities of the e#amine area ill not be seen or occur

+. @ame an @D? method and techni$ues that emplo%s a reflected sound beamthat can be used for the volumetric e#amination of elds!

8ltra sonic test

. =ist + advantages of ,? over other @D? Methods!Advantages:

(ermanent record =ittle surface preparation

Defect identification ver% eas%

@o material limitation

@ot so reliant operator s-illDisadvantages:

,e$uires bul-% and e#pensive machiner%

E#pensive consumables

Cannot detect plate laminations& lac- of interBrun fusion or crac-sperpendicular to #Bra% beam

5. 0f a product is to be stress relieved& h% is it important to use e#actl% thesame ,? procedure before and after stress relieving!

?o ensure the eld has no crac-s or defects.

6. A dar- narro area 'B+ mm ide appears on a radiograph all along the edgeof the area of the representing the eld. ?he "oint has a 6< Degree doublevee groove. What is the indication most li-el% to be!

Slag inclusion

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7. A locali:ed dar-er densit% ,adiographic image ith fu::% edges in thecenter of the eld image that ma% or ma% not be ider than the idth ofthe root pass images is most li-el% hat !

urn through

9. @ame 5 common film artifacts that ma% be cause for re"ection of the,adiographic film!

ilm mar-s

=o densit%

(oor identification

og and processing irregularities

8nacceptable techni$ue and setBup

;. When the radiation source is located inside piping ith the film locatedoutside& singleBall e#posure and singleBall vie& name this t%pe ofe#posure!

(anoramicB single all e#posure& single all vieing )single all singleimage*

1ap verification

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15. riefl% describe good QC practice relating to the installation 2 bolting offlanges!

olt holes shall be aligned ithin 1.9 mm ma#imum offset

lange bolts and studs shall be long enough to penetrate completel%through the nuts minimum of + threads protrusion

olts nuts faces and nut bearings surfaces shall be lubricated beforeinstallation

16. What is an oftenB overloo-ed inspection/ @D? re$uirement on theinstallation of the orifice flanges!

Welds root at orifice flanges shall be ground or machined smooth and flushon the inside of the pipe& and it re$uires ,?.

17. What A(0 documents appl% to the replacement of the e#isting floor for anAboveground Hil Storage tan-!

A(0 65+

19. ,elating to eld fabrication shop evaluation prior to the beginning of pipeelding for a ma"or pro"ect& hat are several -e% items %ou ould loo- foras the 0nspector before %ou approved the shop for elding!

?he inspector must considered the folloingI material specification& elders$ualification& W(S

intI 5M E formula 4 Manpoer& Methods& Materials& Machines&Measurements& Environment

(er SAES J WB

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0t should be same materials& and (? or M(?

5. What is the minimum amount of time that EB7round internall%/e#ternall% for at least '5 mm& and should be clean

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