Welding Question and Answer

Cswip 3.1 question & Answers 1.

Ques Qu esti tion on Ex Exce cerp rptt  1. A crack running along the centreline of a weld bead could be caused by:  A. Use of damp flux B. ack of preheat !. Arc "oltage too high #. $eld bead too deep and "ery narrow %. $hen welding thin plate distortion can be minimised by:  A. $elding $elding from both both sides B. Using U preparations rather than & types !. Using strongbacks #. Using back'step welding

(. E) *+, -1/ 0e"el ! specifies that the limit for the diameter 0# of a single pore in a weld is: #23.(s4 but max. 5mm where s6material thickness. 7or which of the following situations is the pore acceptable8  A. s6%3mm4 measured pore pore diameter diameter 6 -mm  B. s61-mm4 measured pore diameter 6 5.-mm !. s613mm4 measured pore diameter 6 (mm  #. s613mm4 measured pore diameter 6 (.-mm  5. 9ypical temperature used for normalising a !'n steel plate are:  A. ;33';-3A? cracking  B. $eld decay !. $eld metal cracking #. #istortion  ;. 9ransfer of material identification by hard stamping is sometimes not allowed for high integrity applications because it:  A. *s too slow  B. !an be a safety ha@ard !. ay damage the material #. !auses problems with coating operations.  /. $hich of the following is associated with +A$ more often than it is with A welds8 1

 A. >ydrogen cracking in the >A? B. +olidification cracking in the weld metal !. eheat cracking during $>9  #. amellar tearing  . A !'n steel is being welded by A and the electrode run'out lengths that ha"e been used are much shorter than specified by the $+. 9his de"iation may gi"e:  A. *ncreased risk of hydrogen cracking  B. *ncreased risk of solidification cracking  !. ower "alues of >A? toughness  #. >igher "alues of >A? hardness =. $hich of the following is a suitable shielding gas for 7!A$ of stainless steels8  A. 133C Argon B. /3C Argon D (3C >e !. Argon D -C >ydrogen #. Argon D %3C !,% 13. $hich of the following would be considered to be high heat input welding8  A. --3Fmm B. --Fmm !. -.-Fmm #. -GFmm 11. *nitiation of a 9*H arc using high freIuency spark may not be allowed because it:  A. ,ften causes tungsten inclusions B. !an damage electronic eIuipment  !. *s an electrical safety ha@ard  #. ,ften causes stopFstart porosity 1%. A arge grain si@e in the >A? of a !'n +teel weld Joint may ha"e:  A. ow ductility B. ow toughness !. >igh toughness  #. >igh tensile strength 1(. amellar tearing has occurred in a steel fabrication. $hat techniIue could ha"e been used to find it before the weld was made8  A. K'ray examination B. iIuid penetrant examination !. Ultrasonic examination #. *t could not ha"e been found by any inspection method 15. 9he presence of iron sulphides in a weld bead may cause:  A. +olidification cracking B. >ydrogen cracking !. amellar tearing #. $eld decay  1-. $hich type of +A$ flux is susceptible to breaking down into fine particles during circulation8 2

 A. 7used B. )eutral  !. Alloyed  #. Agglomerated 1;. 7or A welding of a ;3mm wall no@@le to a 133mm wall "essel shell4 preheat temperatures should be checked:  A. Before welding startsFrestarts  B. ,n the shell and no@@le  !. At points at least /-mm from the Joint edge  #. All of the abo"e 1/. reheating a low alloy steel prior to welding to minimise the risk of:  A. orosity . B. Excessi"e distortion !. >A? cracking  #. ack of fusion  1. A suitable gasFgas mixture4 for HA$ for aluminium is:  A. 133C !,% B. 133C Argon !. 3C Argon D %3C !,% #. =C Argon D %C 3%  1=. A +9A test is used to measure the:  A. 9ensile strength of the welded Joint B. e"el of residual stress in butt Joints !. 7racture toughness of the >A?  #. 9hrough'thickness ductility of a steel plate 0the ? direction %3. $hich of the following procedures would be expected to produce the least distortion in a 1-mm straight butt weld8  A. 9*H weld4 single'sided4 multi'pass B. A weld4 single'sided4 multi'pass  !. A weld4 double'sided4 multi'pass #. +A$ weld4 1 pass per side %1. 9o impro"e resistance to ser"ice failure caused by cyclic loading4 it is good practice to:  A. Use low heat input welding B. Use steel with a low !E& !. Ensure there are no features that gi"e high stress concentration #. $>9 the fabrication %%. 9he property of a material which has the greatest influence on welding distortion is its  A. Lield strength B. !oefficient of thermal expansion !. Elastic modulus #. !oefficient of thermal conducti"ity 3

%(. B+ E) *+, -1/ 0e"el B specifies the limit for excess weld metal 0h on a butt weld as: h21mmD3.1b4 but max. -mm4 b6 weld width. *n which of the following situations is the measured excess weld metal acceptable8  A. b 6 13 measured excess weld metal 6 %.-mm B. b 6 %3 measured excess weld metal 6 (.-mm !. b 6 (- measured excess weld metal 6 5.-mm #. b 6 5- measured excess weld metal 6 -.-mm %5. 9he risk of hydrogen cracking is greater when A welding:  A. !'n +teels B. Austenitic +tainless +teels !. ow Alloy +teels 7or Ele"ated 9emperature +er"ice  #. ow !arbon +teels 7or !ryogenical +er"ice  %-. 9he maximum hardness in the >A? of a steel will increase if the:  A. >eat input is increased  B. !E& is increased !. oint thickness is decreased  #. Basic electrodes are used %;. 9he first procedure prepared for a $eld rocedure Qualification test is a:  A. p$+  B. $+  !. $Q  #. $A %/. A macrosection is particularly good for showing:  A. 9he weld metal >A? microstructure  B. ,"erlap !. oint hardness #. +patter   %. 7or HA$ the burn'off rate of the wire is directly related to:  A. +tick'out length B. $ire feed speed !. Arc "oltage #. 9ra"el speed  %=. $hich type of submerged arc welding flux is susceptible to moisture pick'up8  A. )eutral B. Agglomerated  !. 7used  #. Are all about the same (3. 9o measure arc "oltage accurately it is recommended that the "oltmeter should be connected:  A. Across the arc and as near as practical to the arc B. Across the power source terminals prior to arc initiation  !. Across the power source terminals during the welding operation  #. Anywhere in the circuit 4

Question Excerpt

1. $elds made with "ery high heat input will show a reduction in:  A. 9ensile ductility  B. )otch toughness !. 7atigue strength #. !reep resistance %. !arbon eIui"alent "alues 0!E& are used to determine how to a"oid the risk of:  A. >ydrogen cracking B. amellar tearing !. +olidification cracking #. weld decay (. !hanging an essential "ariable beyond the allowed limits for a Iualified welding procedure:  A. ay change the mechanical properties of the Joint B. ay ad"ersely affect the Iuality of the weld !. $ill reIuire a new welding procedure to be appro"ed  #. All of the abo"e 5. $hen AH welding in dip transfer 0a short'circuiting mode spatter can be reduced by:  A. Using inductance B. Using 133C!,% !. Using Ar D(3C >e #. *ncreasing the stick'out length  -. A trans"erse tensile test from a $eld rocedure Appro"al ecord 0$A test plate is used to measure:  A. 9ensile strength of the weld  B. 9ensile strength of the Joint !. +tressFstrain characteristics of the weld #. +tressFstrain characteristics of the Joint  ;. 9he highest and lowest heat input positions are considered to be:  A. B highestM A lowest. B. E highestM ! lowest.  !. # highestM B lowest. #. 7 highestM H lowest. /. $hich of the following A$+ A-.1 electrodes has a rutile co"ering:  A. E ;313 B. E /31; !. E /31 #. E ;31( . $hat determines the penetrating power of gammer rays8  A. 9ime B. 9ype of isotope 5

!. +ource'to'film'distance #. +ource strength  =. $hich element has the greatest effect on the >A? hardness of !'n steel8  A. olybdenum  B. !hromium !. 9itanium #. !arbon 13. B+ E) % and B+ E) *+, 1-;15 are specifications for8  A. $elder appro"al testing B. $elding eIuipment calibration  !. $elding procedure appro"al #. !onsumables for submerged arc welding 11. 7or +A$4 what is the effect of raising arc "oltage but keeping all other parameters the same8  A. $eld bead width will increase  B. #epth of penetration will increase !. $eld bead width will decrease #. #epth of penetration will decrease 1%. A penertrameter 0*Q* is used to measure the:  A. +i@e of discontinuity in a weld Joint B. #ensity of a radiographic film !. #egree of film contrast #. Quality of the radiographic techniIue 1(. $hat type of co"ering will an electrode ha"e that is suitable for welding ;3mm !'n steel and can gi"e good weld metal toughness at '-3e has not done any welding for 5 months B. >e has been absent from work for / months !. 9he repair rate for his work exceeds 1C #. >is work has been examined by U9 only 1-. reheating a steel plate with a carbon eIui"alent 0!E& of 3.5 may be reIuired to:  A. #ri"e moisture from the plate B. re"ent excessi"e hardening in the >A? !. re"ent the formation of carbides  #. *mpro"e the mechanical properties of the weld metal  1;. 9he sensiti"ity of a radiograph is assessed:  A. By using a densitometer B. By using an image Iuality indicator 0*Q* !. 7rom the G&A used #. 7rom the sourceFtube to work standoff distance used 6

1/. 9he dip transfer or short'circuiting mode of metal transfer used for *HFAH welding is characteri@ed by:  A. Hi"ing deep penetration  B. Being suitable for positional welding !. Hi"ing low spatter   #. Hi"ing high deposition  1. $hich of the following cutting methods is suitable for cutting stainless steel8  A. lasma  B. ,xy'acetylene  !. ,xy'propane #. *t depends upon the thickness. 1=. $hich of the following would be classed as the most serious type of defect8  A. A buried linear slag inclusion B. Buried lack of inter'run fusion !. +urface breaking lack of sidewall fusion #. +urface porosity %3. Exceeding the maximum interpass temperature specified for a !'n steel weld Joint may gi"e:  A. Excessi"e porosity  B. Burn through !. ower toughness  #. >igher strength %1. $ith reference to the "arious grades of stainless steels which of the following statements is true8  A. 9hey are all non'magnetic B. 9hey all reIuire 133C Ar for HA$ !. 9hey all ha"e "ery high thermal conducti"ity #. ,nly certain grades can be used for ser"ice at "ery low temperatures %%. *n friction welding4 the metal at the interface when the Joining occurs is describes as being in the:  A. iIuid state B. *ntercritical state !. lastic state #. Elastic state %(. 9he temperature range o"er which a steel goes from ha"ing high to low toughness is called the:  A. !ritical transformation temperature B. #uctility dip temperature !. Bi'modal temperature #. 9ransition temperature  %5. *HFAH welding has a tendency to gi"e lack of sidewall fusion when:  A. +pray transfer conditions are used B. 133C !,% shielding gas is used 7

!. ulsed current is used  #. #ip transfer   %-. $hen two different material types are welded together the Joint is referred to as:  A. A composite Joint B. A transition Joint !. An autogenous weld  #. >eterogeneous Joint  %;. #uring $>9 of a complex fabrication4 it is heated to the soak temperature at a much faster rate than specified by the procedure. 9his may:  A. !ause excessi"e oxidation  B. )ot allow sufficient time to relie"e stresses  !. *ntroduce excessi"e compressi"e stresses #. !ause distortion  %/. epair welding of in'ser"ice plant and eIuipment may be more difficult than making repairs during initial fabrication because:  A. 9he material may be contaminated B. Access to repair area may be difficult  !. ositional welding may be needed  #. All of the abo"e %. $hich of these drawing symbols shows weld penetration depth in accordance with B+ E) %%--(8 A. B. !. #.  %=. 7or gammer radiography of a steel weld at (-mm thickness4 the recommended isotope is:  A. 9hulium 1/3 B. Ltterbium 1;=  !. *ridium 1=% #. !obalt ;3 (3. Ultrasonic testing has an ad"antage o"er other )#9 methods for the detection of:  A. ack of sidewall fusion B. oot undercut  !. *ncompletely filled groo"e  #. oot conca"ity

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