Module 17 distortion

Question 1

Temperature expressed in degrees Fahrenheit or degrees Celsius refers to the measure of the
A) intensity of energy
B) amount of energy
C) volume of energy
D) quantity of energy

Answer 1

A) intensity of energy

Question 2

The term heat expresses
A) quantity
B) degrees
C) temperature
D) intensity

Answer 2

A) quantity

Question 3

Which is a common cause of distortion
A) using specified welding procedures
B) unequal heating and cooling of welds
C) free expansion and contraction
D) equal heating and cooling of welds

Answer 3

B) unequal heating and cooling of welds

Question 4

When he did evenly and without restraint in which direction does metal expand
A) transversely ( across)
B) Longitudinally ( lengthwise)
C) volumetrically ( in all directions)
D) only upwards and downwards

Answer 4

C) volumetrically ( in all directions)

Question 5

Transitional expansion occurs when a metal changes from
A) a solid state to a liquid state
B) one crystalline structure to another
C) one colour to another
D) a liquid state to a solid state

Answer 5

B) one crystalline structure to another

Question 6

Which type of distortion results from shrinkage across the world that’s tends to pull a member of Tee joint toward the welded side
A) transitional distortion
B) transverse distortion
C) longitudinal distortion
D) angular distortion

Answer 6

D) angular distortion

Question 7

Which type of distortion results in an overall reduction in length of the weld
A) transitional distortion
B) transverse distortion
C) longitudinal distortion
D) angular distortion

Answer 7

C) longitudinal distortion

Question 8

Which type of distortion refers to the tend( in butt joints ) for the plates to draw together down the length of the joint as you are welding
A) transitional distortion
B) transverse distortion
C) longitudinal distortion
D) angular distortion

Answer 8

B) transverse distortion

Question 9

What causes angular distortion in a Vee groove weld if the plates are free to move?
A) the non-uniform contraction of the weld metal
B) the rapid cooling of the wild metal
C) making tax too small on the end of the plate
D) the metal expanding when it cools

Answer 9

A) the non-uniform contraction of the weld metal

Question 10

What is the primary cause of distortion created from longitudinal shrinkage
A) welding at a slow rate of speed
B) making tax too small at the ends
C) a weld made using the wrong polarity
D) weld beads contracting upon cooling

Answer 10

D) weld beads contracting upon cooling

Question 11

What welding variable is more likely to have the plates of a butt joint draw together, causing transverse distortion
A) welding at a faster rate
B) using straight polarity
C) using reverse polarity
D) welding at a slower rate

Answer 11

D) welding at a slower rate

Question 12

What is one method you can use to correct angular distortion on butt joints
A) weld with one pass
B) weld with many passes
C) weld on both sides
D) Allow the plates to move freely

Answer 12

C) weld on both sides

Question 13

How can you reduce longitudinal distortion?
A) keep weld reinforcement to a minimum
B) weld on one side of the joint only
C) you slow welding speeds
D) avoid back stepping

Answer 13

A) keep weld reinforcement to a minimum

Question 14

What is one method to reduce transverse distortion?
A) use a slow deposition rate
B) use a fast deposition rate
C) align the plate so that the space between them decreases along the length of the weld
D) before welding set the plates closer together than you need for the finish weld

Answer 14

B) use a fast deposition rate

Question 15

What is a disadvantage to rigid clamping and fixturing?
A) set up time slows down production
B) some distortion can occur after releasing the clamping
C) rigid clamping, and fixturing material is expensive
D) this method cannot be used on objects with square corners

Answer 15

B) some distortion can occur after releasing the clamping

Question 16

What is one advantage of a jigging device?
A) it prevents shrinking of parts
B) it allows for welding in all positions and reduces productivity
C) it, maintains accuracy of the finished product
D) it prevents uneven contraction

Answer 16

C) it, maintains accuracy of the finished product

Question 17

Pieces of metal placed on either side of the joint that absorbed the heat of the weld and help prevent distortion are called
A) plate clamps
B) weld positioners
C) chill strips
D) back up bars

Answer 17

C) chill strips

Question 18

What is the purpose of balancing welds around the neutral access of a worn shaft?
A) to equalize the contractions stresses of the welds
B) to increase the heat buildup into the shaft
C) to get more uniform we build up
D) to allow the use of larger electrodes

Answer 18

A) to equalize the contractions stresses of the welds

Question 19

How can you help control distortion when welding light gauge metal
A) increase the preheat temperature
B) decrease your welding speed
C) increase the number of tacks
D) maintain a 90° electrode inclination

Answer 19

C) increase the number of tacks

Question 20

Which fillet weld application produces the greatest amount of distortion
A) staggered intermittent fillet welds
B) a small fillet weld with a concave profile
C) fillet welds produced with one continuous past
D) multi pass fillet welds with a convex profile

Answer 20

D) multi pass fillet welds with a convex profile

Question 21

What is one characteristic of a good welding design?
A) it uses many rapid changes in cross-section
B) it uses formed or roll sections
C) it uses as many small pieces as possible
D) it uses vertical and overhead position weld as much as possible

Answer 21

B) it uses formed or roll sections

Question 22

When several plates must be welded together with butt joints, what is the best weld sequence to control distortion?
A) weld from the outside edges and toward the centre in both directions
B) weld from the corners and toward the centre in all directions
C) weld in concentric circles toward the centre without back stepping
D) weld from the center, and toward the outside in both directions

Answer 22

D) weld from the center, and toward the outside in both directions

Question 23

What is the advantage of using sub assemblies?
A) they provide more welds in the flat position
B) they provide for more welds in vertical and overhead positions
C) jigs, and skeleton frames are not necessary
D) they eliminate the need for formed or rolled sections

Answer 23

A) they provide more welds in the flat position