GMAW - Chapter 25 Multiple Choice

In a free-bend test, the width of the specimen is __________ multiplied by the thickness of the specimen

1.5

In a free-bend test, each corner lengthwise should be rounded in a radius not exceeding _______________ the thickness of the specimen

1/10

Critical parts or welds are usually _____ percent tested.

100

__________ testing is used to determine how well a weld can resist repeated fluctuating stresses or cyclic loading

Fatigue

________ is/are nonmetallic materials trapped in the weld metal, between weld beads, or between the weld and the base metal.

Inclusions

_________ may result from sharp notches between weld beads or between the weld bead and the base metal that trap materials so that they cannot float out.

Inclusions

______ is/are the lack of coalescence between the molten filler and previously deposited filler metal and/or the base metal.

Incomplete fusion

_________ or destructive testing may be used in random sample testing procedure in mass production

Mechanical

_____________ has the capacity to etch rapidly and should be used on polished surfaces only.

Nitric Acid

____________ inclusions can resemble porosity, but, unlike porosity, they are generally not spherical

Scattered

Which of the following is true magnetic particle inspection?

The magnetic field is always at right angles to the direction of the current flow

________________ is a groove melted into the base metal adjacent to the weld toe or weld root and left unfilled by weld metal.

Undercut

______________ is the most frequently used nondestructive testing method

Visual inspection

In an alternate bend test, the specimen is bent ___________ from the gauge lines through an angle of ________________

away, 30 to 45 degrees

A _____________ is an interruption in the typical structure of the weld, whereas a _______ is a flaw which renders the part unable to meet minimum acceptance standards.

discontinuity, defect

The percent of elongation is found by ___________

dividing the elongation by the gauge length and multiplying by 100

Longitudinal shearing strength is obtained by ______________

dividing the maximum force by the sum of the length of welds that ruptured.

Transverse shearing strength is obtained by ___________

dividing the maximum force by twice the width of the specimen.

Tensile strength is determined by __________________

dividing the maximum load by the original cross-sectional area of the specimen at the middle.

Arc strikes will always appear when an acid _________ is used

etch

In a(n) _______________ test, two specimens are prepared and tested, one face bend and one root bend.

guided-bend

Elongation is found by fitting the fractured ends of the specimen together ____________

measuring the distance between gauge marks, and subtracting the gauge length

The two methods used in product quality control are _________ testing.

mechanical and non destructive

With _________ testing all welds can be tested and the part can be used for its intended purpose

nondestructive

In a fatigue test, the results are reported as _____________.

number of stress cycles resisted without failure and total stress used

When using hydrochloric acid in an etch test, the proportion of concentrated hydrochloric acid to water is _____________

one to one

The formula for the cross-sectional area of a specimen at the middle is __________.

pi times the radius squared

Shearing strength is measured in ____________________

pounds per linear inch

Each code give the ______ that changes a discontinuity to a defect.

tolerance

The difference between what is acceptable, fit for service, and perfection is known as

tolerance

The E0718 electrode should not be weaved wider than ____ times the electrode diameter because very little shielding gas is produced.

two and a half

____ appear(s) in either spherical or cylindrical form

Porosity

___________ result(s) when gas that was dissolved in the molten weld pool forms bubbles that are trapped as the metal cools to become solid.

Porosity

Which of the following is true of penetrant inspection?

There are two types: color contrast, and fluorescent

When using hydrochloric acid in an etch test, the welds are immersed in the reagent.

at or near boing temperature