CSWIP 3.2 QUESTIONS Flashcards
Dropping characteristics power source is suitable for
A- MIG AND TIG
B- TIG AND MMA
TIG and MMA
A common gas mixture using MIG welding of nickel ( stainless steel ) alloys to combine good levels of penetration with good arc stability would be -
A- 100% C02
B-100% Argon
C-80 argon - 20 C02
D-98% argon -2% oxygen
D - 98% Argon - 2% Oxygen
Necking -
A) is when the elastic point is reached
B) when the proof stress is reached
C) when the specimen has gone past it’s elastic point and moving into plastic zone
D) is the point just before failure
D) is the point just before failure
The transition range is -
A) is the point between yield and UTS
B) it’s the range between the lowest inter pass temp and the highest inter pass temp where welding can take place .
C) is a range plot in Charpy impact testing
D) is the range curve for hardness testing
A) is the point between yield and UTS
Highest Hydrogen levels would be found in -
A) E6013
B) E6011
C) e6018
B) E6011
Fracture testing -
A)Is used to asses the strength of a fillet weld
B) used to asses the strength of a butt weld
C) Detects lack of root penetration
D) both a and c
C) Detects lack of root penetration
In HICC ( Heat induced Cold Cracking ) , which of the following statements is not true ?
A) it occurs immediately after welding
B) Cellulosic rods are ideal to avoid HICC
C) Pre heating will increase the chances
D) all of the above
D) all of the above
A radio graphic test cannot reveal ?
A) the length of a defect
B) the location of the defect
C) the depth of the defect
D) the type of defect
C) the depth of the defect
Which of the following is the odd one out ?
A) under bead cracking
B) cold cracking
C) HICC ( heat induced cold cracking )
D) Hot cracking
D) Hot cracking
Drooping characteristic:
A) is so called because welding current drops constantly during the welding operation .
B) works on the basis of a large change in voltage equals a small change in amps
C) uses a self adjusting arc to balance amps and Volts
D) works on the basis that a small change in volts equals a large change in Amps
B) works on the basis of a large change in voltage equals a small change in amps
The term A% is used ?
A) To determine the yield point
B) In Charpy impact testing
C) In COTD testing
D) to denote elongation
D) to denote elongation
If the original gauge length of 50mm increases to 55.6 mm in all weld tensile test , the percentage is :
( 55.6mm divided by 50 X 100 )
A) 5.6%
B) 10.2%
C) 11.5%
D) 11.2%
D) 11.2%
If the original gauge length of 50mm increases to 55.6 mm in all weld tensile test , the percentage is :
( 55.6mm divided by 50 X 100 )
A) 5.6%
B) 10.2%
C) 11.5%
D) 11.2%
D) 11.2%
The purpose of post heating a weld joint is ?
A) To change the microstructure of the weld metal
B) To allow time for the hydrogen to diffuse out
C) To temper the micro structure
D) All options are correct
C) To temper the micro structure
Arc Blow
A) occurs when welding DC -
B) occurs when welding DC +
C) only occurs in AC
D) Both A and B
D) Both A and B
Stainless steel 316 type
A) Has a flat , slightly decreasing transition range
B) has a sharp decreasing transition range
C) Has n0 transition range as it has a FCC structure
D) changes from FCC to BCC structure as temperature drops and therefore transition range changes accordingly.
A) Has a flat , slightly decreasing transition range
Bend Testing :
A) Has normally a 10% of t as the radius along the four edges of the specimen .
B) Has the reinforcement removed before testing to check for the number of runs
C) has a former size 0.4 of t
D) both B and C
A) Has normally a 10% of t as the radius along the four edges of the specimen .
Which of the following uses a flat characteristic?
A) processes 111, 141, 121, 136
B) processes 131, 136, 121, 135
C) processes 111, 121, 135, 141
B) processes 131, 136, 121, 135
In NDT -
A) Radiography is the best method for the detection of lack of sidewall fusion in a single V buttt weld
B) DPI can be used for both surface and sub surface defect detection.
C) MPI can be used for both surface and sub surface defect detection.
D) UT is the best method for the detection of rounded ( non planar ) defects
C) MPI can be used for both surface and sub surface defect detection.
Lamellar tearing -
A) is a problem associated with steels of a low through thickness ductility
B) Is always associated with steels that have been sensitised
C) is caused by rapid cooling from above the upper critical point
D) all options are correct
A) is a problem associated with steels of a low through thickness ductility
Tensile testing :
A) is a measure of a materials ability to bend through 180
B) Measures the yield strength of a material only
C) Measures Re and Rm of a material
D) is designed to break the material at low temperatures to determine its susceptibility to brittle fracture .
C) Measures Re and Rm of a material
Re = yield strength
Rm = Ultimate Tensile Strength - the tensile strength is the maximum mechanical tensile stress with wich a specimen can be loaded
Solidification cracking -
A) Occurs after PWHT or immediately after welding
B) Occurs up to 24 hours after welding or PWHT
C) immediately after welding or a few hours
D) Immediately after welding
D) Immediately after welding
Stress relieving after welding ;
A) is normally carried out above the lower critical limit
B) is normally carried out below the lower critical limit
C) is always carried out on high tensile strength materials
D) both B and C
B) is normally carried out below the lower critical limit
723 C Degrees
Proof stress is -
A) used to prove that the residual stresses are considered acceptable.
B) a measure used in certain types of tensile testing
C) To determine the UTS of Aluminium
D) Will determine the transition range
B) a measure used in certain types of tensile testing
Rm is a term used to express the
A) Yeild point of a material
B) Elastic point of a material
C) Elongation of a material
D) Maximum load applied .
D) Maximum load applied .
SAW welding :
A) in a multiple wire system it is not recommended to use AC
B) DC+ generally produces deeper penetration when compared with AC
C) DC + generally produces higher build up when compared with AC
D) DC- generally deeper penetration when compared with DC+
B) DC+ generally produces deeper penetration when compared with AC
MMA , TIG and SAW :
A) Use a flat characteristic output
B) Use a drooping characteristic output
C) Use both drooping and flat characteristic outputs
D) Both MMA and TIG use a drooping characteristic outputs , SAW can use a flat characteristic output .
D) Both MMA and TIG use a drooping characteristic outputs , SAW can use a flat characteristic output .
The heat input for a MMA weld made using 22V , 250A and 250mm per minute travel speed would be ?
Volts x Amps x 60 Divided by 250 x 100 X 0.8
A) 1.54KJ/MM
B) 1.05kj/mm
C) 1.05Kj/cm
D) 1.54KJ/CM
IN MMA welding , to improve deposition , which of the following will be useful?
A) Change from DC + to DC -
B) Change from DC - to DC +
C) Change from AC to DC +
D)Change from DC - to AC
A) Change from DC + to DC -
The ductile to brittle transition is associated with what type of mechanical test ?
A) Tensile
B) impact
C) hardness
D) fillet fracture
B) impact
The four edges of a bend test specimen habe a radius added because ?
A) improve bending
B) prevent cracking
C) prevent cuts to the operator
D) to stop spring back
B) prevent cracking
The yield point of a C/Mn steel within a tensile test is where ?
A) the material is in an elastic condition
B) the material has been plastic all deformed
C) the material has failed
D) is where the UTS has been reached
B) the material has been plastic all deformed
The UTS within a tensile test is where ?
A) The load is at its maximum
B) The load is beginning to fall and then failure
C) The yield has been reached and failure occurs immediately
D) a and b are correct
A) The load is at its maximum
