API-577 Welding Inspection and Metallurgy Exam Questions and Answers

Interpass temperature control is not needed.

There is less susceptibility to cracking from contaminants.

There is less susceptibility to lack of fusion.

The weld pool tends to be sluggish.

Explosion or unstable reaction with the addition of localized heat.

Exothermic decomposition or explosion.

Carbon steel will burn in the presence of chlorine and high heat.

Hydrogen released during welding process can initiate hydrogen-assisted cracking.

Set the machine amperage, voltage, and travel speed.

Confirm the project heat input is followed during welding.

Successfully complete production welds.

Make imperfection/defect-free welds.

Welding processes can affect both mechanical and corrosion properties of a weldment.

The crystalline structure of base metals affects the resulting structure of the weld.

Physical properties of the final weldment can be significantly affected by preheat and postweld heat treatment (PWHT).

A thorough knowledge of weld metal structures is necessary to understand weldability.

Comparable base metal characteristics

Weldability characteristics of base metal

Electrode characteristics

Chemical composition of the base metal

Neutralize and clean the surface within 6 in. (150 mm) of weld bevels

Steam out the piping system and dry

Verify with pH paper that any surface liquid is “basic"

Grind the surfaces near the bevel to remove contaminants

Groove angle

Joint penetration

The weld body

Complete penetration

Welding rates are significantly lower than those obtained with SMAW.

Process is primarily suitable for only carbon steel and low alloy steels.

Process is limited to a flat position.

Weld is not visible during the welding process.

An interruption in the normal physical structure of a material.

An imperfection which is detectable with NDE.

The response or evidence from the application of NDE.

A departure of a quality characteristic from its intended condition.

WPS/PQR aspects of in-service welding.

Technical aspects of hot tapping.

Safety aspects of in-service welding.

Weldability aspects of in-service welding.

Yield.

Strain.

Stress.

Plasticity.

Coating characteristics.

Chemical composition.

Strength of the filler metal.

Welding position.

1050°F (556°C)

1150°F (621°C)

1250°F (677°C)

1350°F (730°C)

Lamellar tearing

Hydrogen cracking

Sulfite stringers

Hot cracking

300°F (150°C)

500°F (260°C)

900°F (480°C)

1000°F (540°C)

Three out of four of the required test specimens must pass.

The test coupon fails and a new coupon is required.

Two additional test specimens from the coupon must be tested and pass.

The WPS fails.

Analysis of the chemical elements in an ingot.

Chemical analysis of a base metal to be welded.

List of the chemical and mechanical properties specified by a purchaser.

Product analysis of mechanical properties of a base metal.

The percentage of carbon that will be in the completed weld

The as-rolled hardness of the welding components

The carbon equivalent of the steel

The rate of cooling after the welding is completed

An area next to the heat-affected zone that has suffered some softening and loss of strength.

The microstructure of the weld that has been melted and will therefore have properties more like a casting than the base metal.

An area near the heat-affected zone affected by welding that may experience intergranular corrosion.

The high residual stress zone adjacent to the weld fusion line that will have higher hardness than the weld or base material.

Chemical composition of the deposited weld metal.

Comparable base metal ultimate strength values.

Weldability characteristics of the metal.

Type and strength of base metal.

Arc drift.

Arc strike.

Arc blow.

Arc deflection.

Under low humidity conditions.

In warm holding ovens.

In sealed plastic containers.

In tightly sealed ovens.

The expected load for which the weld will be subject.

The minimum established acceptance criteria.

The requirements as established in ASME Section XI.

The same criteria required for welder qualification.

The entire radiograph minus 2 in. (50.8 mm) from the edges

Only the area of contrasting density

The specific portion of a radiograph that needs to be evaluated

The portion that is less than 3t from the center of the radiograph, where t is the thickness of the weld

Porosity and slag inclusions of the weld.

Cracking and corrosion resistance of the weld.

Strength and ductility of the weld.

Ductility and hardness of the weld.

Hardenability.

Temper embrittlement.

Heat treatability.

Thermal conductivity.

Radiographic examination is not allowed.

The entire weld circumference for pipe coupon.

36 in. for welder operator qualification.

6 in. for welder qualification.

Pie gauge.

Magnetic-field-sensitive crayon.

Flux line sensitizer.

Calibration gauge.

Reduce travel speed

Proper shielding

Lower heat input

Arc length control

To provide direction to the welder making production welds.

To establish the properties of the weldment.

To document that a welder has correctly followed a WPS.

To establish a welder's capability to make a quality weld.