API 577 Flashcards
The level of learning and training offered by RP 577 is __________________.
not a replacement for AWS CWI training
“DCEN” means.
direct current, electrode negative
Another name or abbreviation for a penetrameter is:
I.Q.I.
A theoretical throat dimension is based on the assumption that the root opening is equal to:
Zero
Welding inspection is a critical part of any ____________ program.
Quality Assurance
Welding inspection can be separated into 3 distinct stages:
before welding, during welding, after welding
One of the items that should be checked prior to welding is:
a. confirm NDE examiners qualifications
b. confirm acceptability of heat treatment procedures
c. review WPS, PQR, and WPQ’s
When discovered, welding defects should be:
removed and re-inspected
NDE examiners should be qualified to ______ when specified by the referencing code.
SNT-TC-1A
As a minimum, each Inspector should review the ______________ prior to starting each job.
site safety rules
An advantage of SMAW is:
can be used on almost all commonly-used metal or alloy
GTAW and SMAW can be distinguished from other processes as they are both used with _______.
cc power supplies
When welding aluminum, and magnesium with GTAW, ______ is normally used.
AC
GMAW can be used in 3 distinct modes of transfer. The coolest or fastest freezing of these transfers is:
short circuiting
A limitation of the FCAW process is:
slag removal
One of the unusual aspects of SAW is that:
the arc is not visible during welding
The three welding documents required to make a production weld (as required by ASME IX) are:
WPQ, PQR, WPS
F numbers are assigned to electrodes based on their ______________.
usability characteristics
What type of electrodes should be stored in a heated oven after initial removal from the package?
low hydrogen
Slightly damp low hydrogen electrodes should be:
rebaked in special ovens
A welder continuity log should be maintained to allow verification that each welder has utilized each welding
process within a _______ period.
six month
Undercut is normally found_______________.
at the weld interface
Weld underbead cracking is normally found _______________________.
in the HAZ
The best NDE method used to inspect butt joints volumetrically (through the entire weld) would be:
RT
Hydrogen cracking may occur in all of the following welding processes, except:
GMAW
In austenitic stainless steel, incomplete penetration is normally corrected by:
proper heat input
“Optical aids” include which of the following:
mirrors
A typical fillet weld gauge would include which of the following:
skew-T
ACFM is an NDE technique that is applied to detect:
surface indications in carbon, alloy and stainless steel
Eddy Current (ET) has limited use in welding inspection, but is often used in____________.
b. coating thickness measurement
c. measuring cladding thickness
The NDE Examiner that performs the radiographic film interpretation should be qualified, as a minimum, to
a _____.
ASNT Level II
Cobalt is normally used for radiographing thicknesses of _________.
1.5” – 7.0”
A film density of 1.0 will allow _______% of light through to the film.
10%
Ultrasonic examination that shows a plan view of the test object would be _____________.
C-scan
Each pass of the UT transducer should overlap the previous pass by _____% of the transducer dimension
10%
Because of the similarities in the shape of the grains and cooling characteristics, a weld can be considered
to be a small_______________.
casting
A defect is also considered to be a (an):
rejectable flaw
The vast majority of metallic materials used in refineries or chemical plants are ___________.
wrought materials
Hydrogen in welding may come from various sources, such as:
a. lubricants
b. moisture
c. net electrodes
Materials with high thermal conductivity will require ___________________.
higher heat input to weld
Metals with a high coefficient of thermal expansion are more susceptible to:
warpage and distortion
The three hardness tests normally used are the:
Rockwell, Vickes, Brinell
In Rockwell hardness testing, the minor load is always____________________
10 kg
One of the most common types of fracture toughness tests is the _________ test.
Charpy
How does preheating carbon steel tend to reduce hydrogen-induced delayed cracking?
slows the cooling rate – prevents martensite formation
Preheat is usually monitored by________________
a. thermocouples
b. crayons
c. contact pyrometer
The primary reason for PWHT is:
relieve residual stresses
Hardness and hardenability are two terms that:
mean two different properties
A typical test for hardenability is the ___________.
Jominy Bar test
The general Brinell Hardness limit for 5CR-Mo steels is:
241
Which of the following elements influences the mechanical properties of weldments more than any other?
carbon
A very specialized external loading weld test is the _________ test.
bend
Austenitic stainless steels typically contain chrome and nickel, and are used for:
a. corrosion resistance
b. resistance to high temperature degradation
The most common measure of weldability and hot cracking of stainless steel is the _________.
ferrite number
An extra-low hydrogen electrode (H4) should be used when hot tapping carbon steels with a CE greater than \_\_\_\_\_\_\_\_\_\_\_\_\_(%)
0.43
To reduce burn-through potential, liquid flow rates should be between _________ and _________ when
hot-tapping.
0.4 – 1.2 m/sec
A common weld defect encountered with the GMAW-S welding process is:
LOF
