chapter 4 Flashcards
Shrinkage, tranverse and longitudinal
Angular distortion* caused by transverse shrinkage
Bending distortion caused by longitudinal shrinkage
Buckling caused by longitudinal shrinkage, and to a minor degree transverse shrinkage. It most often occurs when welding large, thin plates and sheets.
Is it recommended to apply stress relief following mechanical straightening? Yes or no. (Multiple Choice)
Question options:
A) Yes
B) No
A) Yes
Which of the following will produce the least angular distortion in a fillet joint?
Welding with low travel speed
Incorrect Response
Welding with high travel speed
Multi-pass welding
Single pass welding
Single pass welding
In the application of a V heating technique for flame straightening, the initial flame should be located: (Multiple Choice)
Question options:
A) in the narrow part of the V heating area first and progress slowly to the wider portion.
B) in either location to obtain the same results.
C) in the wider part of the V heating area first.
D) in the middle of the V area first.
A) in the narrow part of the V heating area first and progress slowly to the wider portion.
The longitudinal residual stress in a butt welded joint is: (Multiple Choice)
Question options:
A) low tensile.
B) high compressive.
C) high tensile.
D) low flexural.
C) high tensile.
When automatic oxy-fuel gas cutting a strip from one edge of a plate distortion will occur. Why? (Multiple Choice)
Question options:
A) Uneven heating by automatic travel uniformly expands the cut edge
B) Uneven heating by automatic travel expands the edge next to the cut
C) Uneven heating by automatic travel contracts the edge next to the cut
D) Uneven heating by automatic travel shortens the edge next to the cut
The purpose of peening the weld metal is to: (Multiple Choice)
Question options:
A) produce tensile residual stresses on the surface.
B) produce compressive residual stresses on the surface.
C) smooth out the weld ripples.
D) produce contraction of the weld metal.
B) produce compressive residual stresses on the surface.
The type of heat pattern used to curve a wide flange beam is: (Multiple Choice)
Question options:
A) line.
B) spot.
C) strip.
D) vee.
D) vee.
What are the forces exerted by the surrounding material at the spot heated zone? (Multiple Choice)
Question options:
A) Expansion
B) Yield force
C) Compression
D) Thermal expansion
A) Expansion
Is residual stress readily visible and measurable? Yes or no. (Multiple Choice)
Question options:
A) Yes
B) No
B) No
When using heat spots or wedges, it is a good practice to____________ (Multiple Choice)
Question options:
A) apply heat to the bottom of the part to allow gravity to straighten it.
B) apply heat to the short side of a curved object to stretch it.
C) apply heat to the inside of a curved object to stretch it.
D) apply heat to the long side of a curved object to shrink it.
D) apply heat to the long side of a curved object to shrink it.
The welding of seams: (Multiple Choice)
Question options:
A) should be carried up to, or beyond, an unwelded butt joint.
B) must be completed 300 — 400 mm beyond an unwelded butt joint.
C) should be stopped 300 — 400 mm short of an unwelded butt joint.
D) must be welded complete before an unwelded butt joint is started.
C) should be stopped 300 — 400 mm short of an unwelded butt joint.
The best area to produce the first tack weld in butt joints in hollow sections to be welded with the SMAW process is: (Multiple Choice)
Question options:
A) where the root opening is the largest.
B) where the root opening is the smallest.
C) where the root opening is intermediate.
D) None of the above
B) where the root opening is the smallest.
What is needed in order to produce a permanent upsetting of a part when heated? (Multiple Choice)
Question options:
A) Restricted contraction
B) No external restrain
C) The part needs to be free to expand
D) None of the above
A) Restricted contraction
What is the modulus of elasticity or Young’s modulus? (Multiple Choice)
Question options:
A) It is the relationship between strain and stress
B) It is the relationship between stress and strain
C) It is the relationship between ductility and strain
D) It is the relationship between hardness and toughness
B) It is the relationship between stress and strain