CWB Module 12 Mechanical Testing of Welds CORRECT 100%

CWB Module 12 Mechanical Testing of
Welds CORRECT 100%
Exercise Questions - Section 2

1. When a metal is subjected to load, it will be resisted by internal forces within the
metal. The intensity of these forces through a given plane is known as ___________
- ANSWERStress

Exercise Questions - Section 2

2. Select the 3 ways in which a load can act on a cross-sectional area in a body

a) perpendicular

b) tension

c) angular

d) compression

e) helixial

f) shear - ANSWERb) tension
d) compression
f) shear

Exercise Questions - Section 2

3. True or False

Strain is the extension divided by the original length - ANSWERTrue

Exercise Questions - Section 2 & 3

1. If a plot of stress against strain is made for a bar that undergoes plastic
deformation, the stress at which a permanent set is first recorded when the bar is
unloaded is known as:

a) permanent set

b) strain

c) the elastic limit

d) the proportional limit - ANSWERc) the elastic limit

, Exercise Questions - Section 2 & 3

2. True or False

Stress is load divided by the original cross sectional area - ANSWERTrue

Exercise Questions - Section 2

4. The modulus of elasticity, E, for steel is usually taken as:

a) 2000 MPa

b) 200,000 MPa

c) 200 MPa

d) 2,000,000 MPa

e) 29,000 MPa - ANSWERb) 200,000 MPa

Exercise Questions - Section 2 & 3

3. To carry out tensile tests, special machines are needed to exert the necessary
force. They are generally 2 types: ________ and _______________. -
ANSWERMechanical and hydraulic

Exercise Questions - Section 2 & 3

4. If it is desired to measure the strain during a test, an _________________ is
placed on the specimen. - ANSWERExtensometer

Exercise Questions - Section 4

1. Name 3 types of guided bend tests? - ANSWERa) Face bend
b) Root bend
c) Side bend

Exercise Questions - Section 4

2. After bending, the welds are examined for flaws or cracks. It is a condition of
almost all codes that the specimens shall be considered to have failed if, on
examination of the convex surface after bending, there is a crack or open defect
exceeding _____________mm in length measured in any direction - ANSWER3

Exercise Questions - Section 4

3. What is the purpose of a nick break test? - ANSWERTo reveal internal weld
defects

Exercise Questions - Section 5