CWB Level 2: Chapter 4 Questions
with Complete Answers.
X - ray diffraction is used to measure residual stresses and compare changes in - Answer
atomic spacing
Why is the use of a carbon steel fixture not allowed to contact stainless steel directly - Answer
It may cause corrosion
Why does a hot rolled structural beam shape show compressive residual stresses at the edge of
the flange - Answer Because it cools first
Which type of distortion is likely to be produced by a butt weld in long thin material ? Select all
that apply - Answer Longitudinal shrinkage , Longitudinal buckling
Which of the following will produce the least angular distortion in a fillet joint ?. - Answer
Single pass welding
Which of the following will produce the least angular distortion in a fillet joint - Answer Single
pass welding
Which are the major factors that affect transverse shrinkage in butt welds - Answer Plate
thickness , root opening , cross - sectional area of weld , groove angle
Which alloys expand more after heating , mild steel or austenitic stainless steel - Answer
Austenitic stainless steel expands more
Where is the best place to initiate spot heating in a bulged plate - Answer At the centre of the
bulge
When welding heavy plates it is a good idea to have a small root opening rather than butting
the parts tightly together because - Answer the small root opening will allow the plates to
move together as the weld shrinks and to help prevent cracking
When welding a double V - butt joint , the distortion can be limited by . - Answer alternating
weld passes on either side of the joint
When using heat spots or wedges , it is a good practice to . - Answer apply heat to the long
side of a curved object to shrink it . 9 ( Hard to remember )
, When heated , a metal expands - Answer in three dimensions .
When butt welding hollow sections , distortion can be limited by . - Answer Ensuring proper
fit up , ensuring alignment , balancing the heat about the neutral axis
When automatic oxy - fuel gas cutting a strip from one edge of a plate distortion will occur .
Why - Answer uneven heating by automatic travel shortens the edge next to the cut
When a component is welded on one side only the unbalanced shrinkage forces will ? - Answer
cause the welded side to shorten .
What would be the thermal expansion of a steel bar that is heated at 200 ° C -
Answer .00236m
What would be the first effect when applying thermal cutting to a plate - Answer The flame
cut edge is in tension
What would be the effect of cambering outside on a windy day - Answer The wind on the
flange may kink sideways
What is the type of heat pattern typically used to remove a bulge in a plate - Answer A spot
heat pattern spirally out from the centre of the bulge
What is the modulus of elasticity or Young's modulus - Answer It is the relationship between
stress and strain
What is the difference between transverse shrinkage and longitudinal shrinkage in a butt joint -
Answer In longitudinal shrinkage the weld shrinks longitudinally
what is the difference between transverse shrinkage and angular distortion in a butt joint -
Answer The width in the transverse direction is less , and in angular distortion both plates
contract forming a pronounced angle
What is strain - Answer It is shape change produced by stress
What is needed in order to produce a permanent upsetting of a part when heated - Answer
Restricted contraction
with Complete Answers.
X - ray diffraction is used to measure residual stresses and compare changes in - Answer
atomic spacing
Why is the use of a carbon steel fixture not allowed to contact stainless steel directly - Answer
It may cause corrosion
Why does a hot rolled structural beam shape show compressive residual stresses at the edge of
the flange - Answer Because it cools first
Which type of distortion is likely to be produced by a butt weld in long thin material ? Select all
that apply - Answer Longitudinal shrinkage , Longitudinal buckling
Which of the following will produce the least angular distortion in a fillet joint ?. - Answer
Single pass welding
Which of the following will produce the least angular distortion in a fillet joint - Answer Single
pass welding
Which are the major factors that affect transverse shrinkage in butt welds - Answer Plate
thickness , root opening , cross - sectional area of weld , groove angle
Which alloys expand more after heating , mild steel or austenitic stainless steel - Answer
Austenitic stainless steel expands more
Where is the best place to initiate spot heating in a bulged plate - Answer At the centre of the
bulge
When welding heavy plates it is a good idea to have a small root opening rather than butting
the parts tightly together because - Answer the small root opening will allow the plates to
move together as the weld shrinks and to help prevent cracking
When welding a double V - butt joint , the distortion can be limited by . - Answer alternating
weld passes on either side of the joint
When using heat spots or wedges , it is a good practice to . - Answer apply heat to the long
side of a curved object to shrink it . 9 ( Hard to remember )
, When heated , a metal expands - Answer in three dimensions .
When butt welding hollow sections , distortion can be limited by . - Answer Ensuring proper
fit up , ensuring alignment , balancing the heat about the neutral axis
When automatic oxy - fuel gas cutting a strip from one edge of a plate distortion will occur .
Why - Answer uneven heating by automatic travel shortens the edge next to the cut
When a component is welded on one side only the unbalanced shrinkage forces will ? - Answer
cause the welded side to shorten .
What would be the thermal expansion of a steel bar that is heated at 200 ° C -
Answer .00236m
What would be the first effect when applying thermal cutting to a plate - Answer The flame
cut edge is in tension
What would be the effect of cambering outside on a windy day - Answer The wind on the
flange may kink sideways
What is the type of heat pattern typically used to remove a bulge in a plate - Answer A spot
heat pattern spirally out from the centre of the bulge
What is the modulus of elasticity or Young's modulus - Answer It is the relationship between
stress and strain
What is the difference between transverse shrinkage and longitudinal shrinkage in a butt joint -
Answer In longitudinal shrinkage the weld shrinks longitudinally
what is the difference between transverse shrinkage and angular distortion in a butt joint -
Answer The width in the transverse direction is less , and in angular distortion both plates
contract forming a pronounced angle
What is strain - Answer It is shape change produced by stress
What is needed in order to produce a permanent upsetting of a part when heated - Answer
Restricted contraction
