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