456A Weld Quality Control 2

Question 1

What is ultrasonic testing (UT) and what are its advantages over radiographic testing?

Accepted Answer

A method using high-frequency sound waves to detect internal discontinuities; advantages include immediate results, no radiation hazard, ability to detect planar defects (cracks, lack of fusion), and portability

Answer

A hearing test for welders

Answer

A method using ultrasonic cleaning of welds

Answer

A surface-only inspection method

Question 2

What is magnetic particle testing (MT/MPI) and what type of discontinuities does it detect?

Accepted Answer

Applying magnetic particles to a magnetized workpiece to detect surface and near-surface discontinuities such as cracks, incomplete fusion, and porosity in ferromagnetic materials

Answer

Testing the magnetic properties of filler metals

Answer

Measuring the magnetic field strength of the welding arc

Answer

Testing whether the base metal is magnetic

Question 3

What is a welder qualification test under CSA W47.1?

Accepted Answer

A practical test where a welder produces test welds on a specific joint configuration, position, and process; the welds are then tested (bend, RT, or UT) to verify the welder can produce acceptable quality

Answer

A written exam on welding theory

Answer

An eye exam to check the welder's vision

Answer

A safety certification course

Question 4

What is dye penetrant testing (PT/LPI) and when is it used?

Accepted Answer

Applying a visible or fluorescent dye to detect surface-breaking discontinuities by capillary action; used on non-ferromagnetic materials and when MPI cannot be used

Answer

Dyeing the weld for appearance

Answer

Testing the colour of the weld metal

Answer

A method for measuring weld penetration depth

Question 5

What is the acceptance criteria for undercut in a structural fillet weld according to CSA W59?

Accepted Answer

Maximum 1 mm (1/32 in.) depth for statically loaded structures; more restrictive limits apply to dynamically (cyclically) loaded structures and critical connections

Answer

Any undercut is acceptable

Answer

Maximum 5 mm depth

Answer

Undercut is only measured on groove welds

Question 6

What documentation must accompany a completed structural weld per CSA W47.1 and W59?

Accepted Answer

Welder identification/qualification records, WPS used, NDE reports, material test reports (MTRs), fit-up inspection records, and any non-conformance reports

Answer

Only the welder's name

Answer

Only photographs of the finished weld

Answer

No documentation is required if the weld passes visual inspection