ALL QUESTIONS AND CORRECT ANSWERS |
ALREADY GRADED A+ | LATEST EXAM |
VERIFIED ANSWERS
What is lamination or lamellar tearing? ---------CORRECT ANSWER----------
-------tear in the base metal parallel to the length of the base metal; usually
a manufacturing defect, but can be caused by improper joint configuration
vs weld size specified
What is concavity? ---------CORRECT ANSWER-----------------the face of the
weld being below the toes of the weld
What is convexity? ---------CORRECT ANSWER-----------------weld being
above the toes of the weld
What’s another term for convexity? ---------CORRECT ANSWER---------------
--excessive reinforcement
What are the most common weld types that cause slag inclusions? ---------
CORRECT ANSWER-----------------SMAW and FCAW
How do you identify slag inclusions? ---------CORRECT ANSWER-------------
----RT and UT only
,What is a hi-lo gauge ---------CORRECT ANSWER-----------------it detects
misalignment
What are the only tools for inspection of stainless ---------CORRECT
ANSWER-----------------flashlight, mirror, hi-lo gauge
What are types of destructive tests? ---------CORRECT ANSWER-------------
----bend, tensile, peel, charpy v-notch test
What is the common code book we refer to here? ---------CORRECT
ANSWER-----------------ASME B31.3 Process Piping Code
What does "shall", "should", and "may" mean? ---------CORRECT
ANSWER-----------------"shall"= required
"should"=strong suggestion
"may"= if you want to, but do not have to
What are the best ways to avoid cold cracking ---------CORRECT
ANSWER-----------------preheating to slow down the cooling rate so less
martensite forms
post weld heat treat to temper the martensite to make it more ductile
What is the roughness average for mechanically polished surfaces? ---------
CORRECT ANSWER-----------------Below 30 Ra
,What is the unit of measure for surface roughness? ---------CORRECT
ANSWER-----------------Roughness average (Ra)
What organization determines CFOS? ---------CORRECT ANSWER----------
-------CGA G-4.1 (Compressed Gas Association)
How can you verify if the material is cleaned for oxygen service? ---------
CORRECT ANSWER-----------------by checking the C of C (Certificate of
Conformance) or the MTR (Material Test Report) that came with the
material
How is a surface electropolished? ---------CORRECT ANSWER----------------
-Run the material through a solution, energize it the tube and let it react
with the electrolytes in the solution and act as a fine polishing abrasive
What is the roughness average of an electro-polished surface ---------
CORRECT ANSWER-----------------1-10 Ra, will have a mirror finish
How is roughness average measured? ---------CORRECT ANSWER----------
-------profilometer
How does a profilometer work? ---------CORRECT ANSWER-----------------It
has a probe with a diamond tip on the end that when running across a
surface it measure the peaks and valleys and gives the average
, Inert gas on the inner diameter while welding= ---------CORRECT
ANSWER-----------------purging
Inert gas on the outer diameter while welding = ---------CORRECT
ANSWER-----------------shielding
What gas are we protecting stainless steel from when welding? ---------
CORRECT ANSWER-----------------oxygen
What gases can be used on stainless steel while welding (except TIG) ------
---CORRECT ANSWER-----------------Argon, nitrogen, helium
TIG welding needs to be ___ for stainless steels, why? ---------CORRECT
ANSWER-----------------Argon bc nitrogen is too unstable and will not create
a good plasma flow of the arc to the metal. He or H2 can be mixed to
create a hotter arc but is discouraged for thin wall tubing
What is the main priority of argon when purging? ---------CORRECT
ANSWER-----------------remove oxygen and impurities from weld area
What is significant about orbital welding and purging with argon? ---------
CORRECT ANSWER-----------------A slight pressure is required on the ID so
the weld does not become concave.
What measures concavity or convexity on a weld? ---------CORRECT
ANSWER-----------------Magnahelic (it measure pressure flow)