Magnetic Testing Essentials Quiz

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Questions and Answers

What factor affects the detectability of subsurface indications?

Type of material

Distance from the weld

Temperature of the surface

Depth below surface (correct)

What makes interpretation more difficult for powder buildup?

Temperature of the surface

Type of surface material

More defined powder buildup

Less defined powder buildup (correct)

How are false and nonrelevant indications defined by ASTM E709?

Nonrelevant: Indications resulting from magnetic forces; False: Indications resulting from leakage fields

Nonrelevant: Indications resulting from leakage fields; False: Indications not result of magnetic forces (correct)

Nonrelevant: Indications not related to the surface; False: Indications resulting from magnetic forces

Nonrelevant: Indications not result of magnetic forces; False: Indications resulting from leakage fields

What causes false indications with wet fluorescent MT?

Weld scale Signup and view all the answers

What does HAZ stand for in the context of indications?

Heat Affected Zone Signup and view all the answers

What characteristic affects the detectability of subsurface indications?

Orientation Signup and view all the answers

In what type of steel are dry powder indications found in slot welds?

Armor steel Signup and view all the answers

What will make interpretation more difficult for dry powder indications?

Less defined powder buildup Signup and view all the answers

What is the recommended intensity for black lights used in magnetic testing?

Not less than 800 µW/cm2 Signup and view all the answers

Which current type is preferred for deeper penetration in magnetic testing?

Direct current Signup and view all the answers

What are dry particles more sensitive to in magnetic testing?

Subsurface defects Signup and view all the answers

What are wet particles more sensitive to in magnetic testing?

Very fine surface defects Signup and view all the answers

What are the two sequences for applying magnetic particles during testing?

Residual method and continuous method Signup and view all the answers

What determines the direction of the magnetic field in magnetic testing?

Shape and orientation of the defect in relation to the part's principal axes Signup and view all the answers

What factors does sensitivity in magnetic testing depend on?

Particle type, magnetizing current, and sequence Signup and view all the answers

What does the equipment used for magnetic testing depend on?

Size, shape, and number of parts to be tested Signup and view all the answers

What does test surface preparation involve in magnetic testing?

Removing dirt, rust, loose scale, and oil or grease from the test area Signup and view all the answers

How should the magnetic field be verified before testing in magnetic testing?

Using production or fabricated test parts with discontinuities or magnetic field indicators Signup and view all the answers

What are magnetic field indicators used for in magnetic testing?

Indicate field strength and direction at the surface in the area of the part under test Signup and view all the answers

What are crucial steps in magnetic testing?

Effective area of coverage, overlap of effective areas, yoke placement for weld examination, and application of magnetic particles Signup and view all the answers

Study Notes

Magnetic Testing Training Material Summary

Black lights with a wavelength of 3.6x10-4 mm and intensity not less than 800 µW/cm2 are recommended for magnetic testing.
Techniques for magnetic testing include selection of current type, particles, method of application, sequence, direction of field, sensitivity level, and equipment.
Direct current is preferred for deeper penetration, while alternating current is more sensitive to surface defects.
Dry particles are more sensitive to subsurface defects, while wet particles are more sensitive to very fine surface defects.
Residual method and continuous method are two sequences for applying magnetic particles during testing.
The direction of the magnetic field is decided based on the shape and orientation of the defect in relation to the part's principal axes.
Sensitivity in magnetic testing depends on factors such as particle type, magnetizing current, and sequence.
The equipment used for magnetic testing depends on the size, shape, and number of parts to be tested.
Test surface preparation involves removing dirt, rust, loose scale, and oil or grease from the test area.
The magnetic field should be verified before testing by using production or fabricated test parts with discontinuities or magnetic field indicators.
Magnetic field indicators, like the "pie gage," are used to indicate field strength and direction at the surface in the area of the part under test.
The effective area of coverage, overlap of effective areas, yoke placement for weld examination, and application of magnetic particles are crucial steps in magnetic testing.

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Description

Test your knowledge of magnetic testing with this training material summary quiz. Explore topics such as recommended equipment, techniques, current types, particle selection, sensitivity levels, and more. See how well you grasp the essential concepts of magnetic testing.