multi choice question paper ( msr - wi - 3 ).doc

8/12/2019 Multi Choice question Paper ( MSR - WI - 3 ).doc

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THE WELDING INSTITUTE

Welding Inspection, Steels WIS 5

Multi Choice Question !pe" # MS$ WI % &

N!'e ( H) Muh!''!d $!*!li +!"nen

ns-e" !ll .uestions

1. The likelihood of a brittle fracture in steels will increase with :

a. The formation of a fine grain structure

b. A reduction in-service temperature to sub-zero conditions

c. A slow cooling rate

d. All of the above

2. Hdrogen cracking in HA! is most likel to occur when welding :

a. "arbon manganese steels

b. Austenitic stainless steel

c. #icro alloed steel $ H%&A '

d. &ow carbon steel

(. )reheating for arc welding applies to :

a. Assembl and tack welding onl

b. *oint over 2+ mm thick onlc. Assembl welding onl

d. ,hen using the ##A welding process onl

e. oth a and b

. ,hich of the following destructive tests would indicate the toughness value of the weld

metal/parent metal and HA! 0

a. #acro

b. ick break

c. Tensiled. "harp ee notch

+. ,hat constituent is needed in a coating of an electrode to prevent the formation of porosit

when welding rimming steel 0

a. 3ron powder

b. )otassium silicate

c. %ilicon

d. "alcium carbonate

4. ,elds made with high heat inputs show a reduction in one of following properties 0

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a. 9uctilit

b. Toughness

c. longation

d. )enetration

;. ,hich of the following steel tpes would give ride to the formation of porosit when

autogenousl welded with an arc welding process

a. which ma be added t steel> has the greatest affect on creep

strength

a. Tungsten

b. #anganese

c. "arbon

d. #olbdenum

?. The HA! associated with a fusion weld

a. "an not be avoided

b. @suall has the highest tensile strengthc. 3s usuall martensitic

d. oth a and b

e. All of the above

1. ,hat four criteria are necessar to produce hdrogen induced cold cracking 0

a. Hdrogen> moisture> martensitic grain structure and heat

b. Hdrogen> poor weld profiles> temperatures above 2" and a slow cooling rate

c. Hdrogen> a grain structure susceptible to cracking> stress and a temperature below 2"

d. Hdrogen> eBisting weld defects> stress and a grain structure susceptible to cracking

11. A carbon eCuivalent $ CE ) of .+D :

a. 3s high for carbon manganese steel and ma reCuire a preheat over 1"

b. 3s generall significant for carbon for manganese steels and is certainl not to be taken

into consideration for preheat temperatures

c. 3s high for carbon manganese steels and ma reCuire a preheat temperature over (" as

to avoid cracking

d. 3s calculated from the heat input formula

12. 3n a martensitic grain structure what would ou eBpect to increase 0

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a. 9uctilit

b. Hardness

c. Toughness

d. All of the above

1(. ,hat do ou understand b the term minimum interpass temperature 0

a. #inimum post weld heat treatment applied to a weld

b. #inimum stress relief temperature

c. The lowest temperature to be used during preheat

d. The lowest temperature allowed during welding and between weld passes

1. ,hich of the following heat treatments on steel cools down in air from the austenite region 0

a. ormalising

b. Annealing

c. Tempering

d. %tress relieving

1+. ,hat is the purpose of microscopic eBamination of a weld 0

a. To determine the number and tpe of defects present

b. To determine the grain size

c. To determine the strength of the weld

d. oth a and b

e. All of the above

14. ,hich of the following units could a tensile specimen be measured in 0

a. )ounds per sCuare inch

b. ewton per sCuare inches

c. *oules

d. oth a and b

1;. Assuming that the welding process> material thickness> carbon eCuivalent and the welding

parameters to be the same> which of the following Eoint tpes would normall reCuire the

highest preheat temperature

a. dge Eoint

b. &ap Eoint

c. utt Eoint $ single- '

d. Tee Eoint $ fillet welded '

1=. Austenitic stainless steels are more susceptible to distortion when compared to ferritic steels

this is because :

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a. High coefficient> low thermal conductivit

b. High coefficient> high thermal conductivit

c. &ow coefficient> high thermal conductivit

d. &ow coefficient> low thermal conductivit

1?. ,hich of the following will most likel reCuire the preheat temperature to be increased 0

a. An increase in travel speed

b. A reduction in material thickness

c. An increase in electrode diameter

d. one of the above

2. ,hich of the following properties ma be applicable to a carbon steel weld $ CE .= '

welded without preheat 0

a. arrow heat affected zone and hardness value in eBcess of H

b. road heat affected zone and hardness values in eBcess of H

c. A ver tough and narrow heat affected zone

d. arrow heat affected zone and low hardness values

21. ,hich of the following materials is considered to be the easiest to weld 0

a. #ild steel

b. #edium carbon steels

c. #artensitic stainless steel

d. root gap 2.+ mm $ welded from on side onl '

b. 9ouble- butt-welded both sides> root gap 2. mm

c. %ingle-@ butt with backing

d. one of the above can be used for mechanized welding

2. ,hich is the correct heat input for the following parameters> amps (+> volts (2 and the

travel speed (1 mm / minute $ ##A welding process '

a. 2.14 k*/mm

b. .(4 k*/mm,3% + 5u paper #%6 - ,3 7 ( )age of 4



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c. 214 k*/mm

d. (.4 k*/mm

2+. Assuming thet the applicable specification makes no mention of arc strikes> what would ou

eBpect to do as a welding inspector if arc strikes were found on a component made of a high

tensile strength material

a. Have the welder re-Cualified

b. 3gnore them

c. Have the area checked for possible cracking

d. "ut out the entire weld where the arc strikes eBist

24. A multi-pass ##A butt weld made on carbon steel consists of + passes deposited using a

4mm diameter electrode. A 12-pass weld made on the same Eoint deposited using a mm

diameter electrode on the same material will have :

a. A lower heat input and a higher degree of grain refinement

b. A lower heat input and a coarse grain structure

c. A lower amount of distortion and a higher degree of grain refinement

d. A higher amount of distortion and a lower degree of grain refinement

2;. ,hat is the purpose of a tensile test 0

a. To measure ultimate tensile strength

b. To measure the elongation of a material

c. To measure the ield strength of a material

d. All of the above

2=. ,hich of the following mechanical tests can be used to give a Cuantitative measurement of

weld zone ductilit 0

a. Tensile test

b. end test

c. "harp notch test

d. All of the above

2?. ,hich of the following are reasons for appling preheat 0

a. The removal of residual stress

b. To aid slow cooling and reduce the carbon contentc. To reduce the chance of a brittle grain structure and to reduce the chance of hdrogen

entrapment,3% + 5u paper #%6 - ,3 7 ( )age + of 4



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d. 3ncrease the ultimate tensile strength values and increase overall weldabilit

(. ,hich of the following are true with regards to a charp test

a. 3tFs a static test used to determine a materials notch toughness in the weld regionb. 3tFs dnamic test used to determine a materials notch toughness in the weld region

c. 3tFs a destructive test to give a measurement of through thickness ductilit

d. one of the above

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multi choice question paper ( msr - wi - 3 ).doc

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