welding qc q&a

7/26/2019 Welding QC Q&A

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Candidates Name: _____________ Nationality/Location: ________________

Interview Date: _____ Interviewer(s): _________________________________

Rate Technical Knowlede (!echanical" #C$%&)

'ality ystems

1. Describe the difference between QA & QC?

*nswer: Quality Control is the operational techniques (Inspection,!a"ination & #estin$% that are used to fulfill require"ents for quality.Quality Assurance is the syste" of action and plannin$ needed to proideconfidence that a 'roduct or erice will satisfy quality require"ents

). *hat do quality syste" audits ealuate?

*nswer: #he de$ree of quality syste" confor"ance to establishedrequire"ents.

+. audi Ara"co has adopted the basic fra"ewor and definitions of theInternational Quality yste" tandards I-/000 eries. #his has been done toproide uniersal understandin$ and i"proe co""unication between the

C-'A23 and prospectie C-2#4AC#-4 whose Quality yste" iscon$ruent with the I-/000 eries. Describe the basic ele"ents of an I-/000 eries Quality 'ro$ra"?

*nswer:

Quality ana$e"ent & Quality Assurance tandards per I-/000Quality yste"s per I-/001, /00), /00+

Quality 'lan 5uidelines per I- 10006

!echanical/+eldin

7. *hat is an essential ariable as related to a *eld 'rocedure pecification

(*'%?

*nswer: A chan$e in a weldin$ condition that will affect the weld8s"echanical properties.

6. *hat is the relationship between a 'rocedure Qualification 4ecord ('Q4% anda *'?

*nswer: #he 'Q4 docu"ents what occurred durin$ the weldin$ andtestin$ of the test coupon.

9. :eat input (A* per A I;% is a co"bination of what two electricalcharacteristics & trael speed?

*nswer: . *hat are + potential sources of :ydro$en encountered durin$ A*process?

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Interview Date: _____ Interviewer(s): _________________________________

*nswer: oisture in the "etal and electrode coatin$, oil, ele"ental :ydro$en inthe base "etal

/. *hat are seeral liely causes of porosity in carbon steel welds usin$ the

A* process?

*nswer: 'oor weldin$ technique and equip"ent, e!cessie wind, "oisture &weld conta"inants.

10. *hat di"ension is "easured to deter"ine the sie of a concae fillet weld?

*nswer: #hroat

1). *hat di"ension is "easured to deter"ine the sie of a cone! fillet weld?

*nswer: @e$1+. *here would cracin$ "ost liely occur fro" e!cessie current input in asin$le pass weld?

*nswer: Centerline of the weld

17. sin$ 5#A* process, describe what happens to a weld without properpur$in$Bbac $assin$ on "aterial?

*nswer: -!idation at the ID (u$arin$%

16. 2a"e + of the 6 "echanical tests in A I; e"ployed for procedure &perfor"ance qualifications?

*nswer: #ension, 5uided end, illetweld, 2otchtou$hness & tudweld tests

INT,R-I,+ *TT*C.!,NT w/*N+,R K,

Rate Technical Knowlede (!echanical" #C$%&)

!echanical/NDT (assme !*+ 0rocess sed 1or all 2estions)

19. :ow is a$netic 'article inspection of a weld usin$ the wet continuous test"ethod perfor"ed?

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Interview Date: _____ Interviewer(s): _________________________________*nswer: #he particles (usually fluorescent% are sprayed, poured on orapplied by i""ersion and the "a$netiin$ current is applied while theparticles are still flowin$.

1=. Indications with @iquid 'enetrant #estin$ are easily seen if the surface hasbeen prepared by $rindin$ prior to testin$? #rueBfalse? *hy?

*nswer: alse, because $rindin$ can s"ear "etal and "asBcoerdiscontinuities.

1>. 2a"e an 2D# "ethod and technique that e"ploys a reflected sound bea"that can be used for the olu"etric e!a"ination of welds?

*nswer: ltrasonic #estin$ usin$ hear *ae #echnique proides $oodolu"etric e!a" coera$e.

1/. @ist + disadanta$es of 4# oer other 2D# ethods.

*nswer: 4adiation afety 'recautions, 'lanar defects not readilydetectable, :eay equip"ent

)0. If a product is to be stress relieed, why is it i"portant to use e!actly thesa"e 4# procedure before and after stress reliein$?

*nswer: o that a baseline ealuation is perfor"ed to ensure thatborderline indications are not "isinterpreted after stress relief.

)1. A dar narrow area )+"" wide appears on a radio$raph all alon$ the ed$eof the area representin$ the weld. #he Eoint has a 90De$ree doubleee $rooe.*hat is the indication "ost liely to be?

*nswer: !ternal ndercut

)). A localied darer density 4adio$raphic i"a$e with fuy ed$es in the centerof the width of the weld i"a$e that "ay or "ay not be wider than the width of the

root pass i"a$e is "ost liely what?*nswer: urnthrou$h

)+. 2a"e 6 co""on fil" artifacts that "ay be cause for reEection of4adio$raphic il"?

*nswer: il" cratches, li$ht leas, che"ical stains, fo$$ed fil", static"ars, water "ars, streas, cri"p "ars, fin$er "ars, lint, dirt

)7. *hen the radiation source is located inside pipin$ with the fil" locatedoutside, sin$lewall e!posure and sin$lewall iew, na"e this type of e!posure?

*nswer: 'anora"ic

)6. :ow do $a""a rays co"pare with ;rays when applied to 4# of welds?

*nswer: 5a""a rays hae $reater penetration ability, but $ie poorercontrast.

Rate 0eci1ic Knowlede (,30erience)

)9. 'er A +1.+ (assu"e latest edition%, na"e three of the four Cate$oriesof luid erice?

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Interview Date: _____ Interviewer(s): _________________________________*nswer: Cate$ories D, , :i$h 'ressure & 2or"al

)=. 'er A +1.+, who is responsible for classification of serice to a $iencate$ory?

*nswer: #he -wner

)>. 'er A +1.+ (assu"e latest edition%, what are the 4# require"ents forocet welds in seere cycle serice?

*nswer: 2one

)/. 4elatin$ to the aboe question, 5ie $ood reasons why rando" 4# of socetwelds is reco""ended?

*nswer: oth $ross weldin$ defects & poor quality welders can beidentified, with repairs and correctie action taen, & 5ap can be erified.

+0. riefly describe $ood QC practice relatin$ to the installation & boltin$ offlan$es?

*nswer:


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Interview Date: _____ Interviewer(s): _________________________________1. Drawin$s, Calcs & Data reiew

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Interview Date: _____ Interviewer(s): _________________________________'er A*011 (show section where infor"ation is found, reiew withcandidate%

1. *hat is the "a!i"u" sie of low :ydro$en (=01>% per"itted?

). *hat are the dia"eter li"itations (per pipe sie% for different weldin$

processes?A*G

5#A*G

5A*G

+. a% *hat is the require"ent (aterial, location% for brid$e tacs?

b% In what "ust brid$e tacs be contained to aoid the need for urfaceethod 2D#?

7. a% or te"porary supports and attach"ents welded to the pipe, what arerequire"ents related to aterial?

b% 2D#?

6. *hat is the "a!i"u" a"ount of ti"e that =01> electrodes can be eptout in the field?

9. *hat is the "ini"u" dryin$ te"perature and dryin$ ti"e?

=. :ow "any ti"es can electrodes be rebaed?

>. *hat is the "a!i"u" internal "isali$n"ent of butt Eoints?

/. 'ipin$ durin$ preparation before fit up shall be cleanedB$roundinternallyBe!ternally for what distance fro" the ed$e of the prepared Eoint?

10.oist surfaces require "oisture re"oal and surfaces to be preheated"ust be preheated to what distance fro" the Eoint ed$e?

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welding qc q&a

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