Canadian Welding Bureau
TDN • 1L BWC
CWB ✦
✦
L1 Welding Inspector Level 1 · Basic Welding Inspection
S E T T I N G T H E S TA N D A R D I N W E L D I N G C E R T I F I C AT I O N
CANADA
CWB Inspector Level 1 — Basic Welding Inspection
N DT M E T H O D S · R A D I O G R A P H Y · U LT R A S O N I C · M P I · L I Q U I D P E N E T R A N T · V I S U A L I N S P E C T I O N
ORGANIZATION Canadian Welding Bureau (CWB) CERTIFICATION Welding Inspector Level 1
MODULE Basic Welding Inspection & NDT TOTAL QUESTIONS 25 Questions
SUBJECT AREAS RT · UT · MT/MPI · PT · VT · Inspection FORMAT Multiple Choice & True/False — Select the
Planning Single Best Answer
BASIC WELDING INSPECTION EXAMINATION INSTRUCTIONS
▸ Select the single best answer for each question based on CWB Welding Inspector Level 1 NDT and inspection content.
▸ Content covers: radiographic testing (X-ray vs. gamma, isotopes Co-60/Ir-192, penetrameters), ultrasonic testing (frequencies
2.5–5 MHz, longitudinal/shear waves, couplant), magnetic particle inspection (AC/DC yoke, prod restrictions, non-magnetic
limitations), liquid penetrant inspection (halogen restrictions on austenitic SS, surface-only detection), visual inspection
(before/during/after welding), inspection planning (checklists, procedure verification), and inspector qualifications.
SECTION I — NDT METHODS & INSPECTION PRINCIPLES Questions 1 – 25
1. What is the purpose of ultrasonic couplant during inspection?
A. To reduce friction on the transducer.
B. To fill voids and surface imperfections during testing.
C. To increase the energy transmitted into the material.
D. To reflect subsonic sound waves that interfere with testing.
CORRECT ANSWER C — To increase the energy transmitted into the material.
RATIONALE ULTRASONIC COUPLANT increases the ENERGY TRANSMITTED into the material by eliminating the air gap
between the transducer and the test surface. Sound waves reflect almost completely at an air-solid interface,
so couplant (gel, oil, water) is essential. In an X-ray tube, 99% of energy becomes HEAT and only 1% becomes
X-RAYS — making X-ray production extremely inefficient. For liquid penetrant on AUSTENITIC STAINLESS
STEEL, halogen content must be limited because halogens can cause STRESS CORROSION CRACKING under
certain conditions.
2. A welding inspector is required to be proficient in all types of inspection methods. True or False?
A. True — inspectors must know all NDT methods.
B. False — inspectors may specialize in specific methods.
CORRECT ANSWER A — True — inspectors must know all NDT methods.
RATIONALE TRUE. Because of the variety of welded structures requiring inspection, an inspector is required to be
PROFICIENT IN ALL TYPES of inspection methods. A NOSE TUBE is the hose in which the radiation source is
projected through. An INSPECTION CHECKLIST is used by welding inspectors to STANDARDIZE inspections
and provide a FORMAT for documentation. When using MAGNETIC PARTICLE INSPECTION, the use of PRODS is
prohibited by certain codes due to the chance of causing ARC STRIKES.
TDN • 1L BWC
CWB ✦
✦
L1 Welding Inspector Level 1 · Basic Welding Inspection
S E T T I N G T H E S TA N D A R D I N W E L D I N G C E R T I F I C AT I O N
CANADA
CWB Inspector Level 1 — Basic Welding Inspection
N DT M E T H O D S · R A D I O G R A P H Y · U LT R A S O N I C · M P I · L I Q U I D P E N E T R A N T · V I S U A L I N S P E C T I O N
ORGANIZATION Canadian Welding Bureau (CWB) CERTIFICATION Welding Inspector Level 1
MODULE Basic Welding Inspection & NDT TOTAL QUESTIONS 25 Questions
SUBJECT AREAS RT · UT · MT/MPI · PT · VT · Inspection FORMAT Multiple Choice & True/False — Select the
Planning Single Best Answer
BASIC WELDING INSPECTION EXAMINATION INSTRUCTIONS
▸ Select the single best answer for each question based on CWB Welding Inspector Level 1 NDT and inspection content.
▸ Content covers: radiographic testing (X-ray vs. gamma, isotopes Co-60/Ir-192, penetrameters), ultrasonic testing (frequencies
2.5–5 MHz, longitudinal/shear waves, couplant), magnetic particle inspection (AC/DC yoke, prod restrictions, non-magnetic
limitations), liquid penetrant inspection (halogen restrictions on austenitic SS, surface-only detection), visual inspection
(before/during/after welding), inspection planning (checklists, procedure verification), and inspector qualifications.
SECTION I — NDT METHODS & INSPECTION PRINCIPLES Questions 1 – 25
1. What is the purpose of ultrasonic couplant during inspection?
A. To reduce friction on the transducer.
B. To fill voids and surface imperfections during testing.
C. To increase the energy transmitted into the material.
D. To reflect subsonic sound waves that interfere with testing.
CORRECT ANSWER C — To increase the energy transmitted into the material.
RATIONALE ULTRASONIC COUPLANT increases the ENERGY TRANSMITTED into the material by eliminating the air gap
between the transducer and the test surface. Sound waves reflect almost completely at an air-solid interface,
so couplant (gel, oil, water) is essential. In an X-ray tube, 99% of energy becomes HEAT and only 1% becomes
X-RAYS — making X-ray production extremely inefficient. For liquid penetrant on AUSTENITIC STAINLESS
STEEL, halogen content must be limited because halogens can cause STRESS CORROSION CRACKING under
certain conditions.
2. A welding inspector is required to be proficient in all types of inspection methods. True or False?
A. True — inspectors must know all NDT methods.
B. False — inspectors may specialize in specific methods.
CORRECT ANSWER A — True — inspectors must know all NDT methods.
RATIONALE TRUE. Because of the variety of welded structures requiring inspection, an inspector is required to be
PROFICIENT IN ALL TYPES of inspection methods. A NOSE TUBE is the hose in which the radiation source is
projected through. An INSPECTION CHECKLIST is used by welding inspectors to STANDARDIZE inspections
and provide a FORMAT for documentation. When using MAGNETIC PARTICLE INSPECTION, the use of PRODS is
prohibited by certain codes due to the chance of causing ARC STRIKES.
