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CWB 2 Visual Weld Inspector Exam (solved & updated).
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CWB 2 Visual Weld Inspector Exam (solved & updated).
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CWB 2 Visual Weld InspectorExam (solved & updated)
A consumable electrode is:
AN electrode which melts and provides metal to fill the joint
The weld heat affected zone is:
the portion of the base metal adjacent to the weld metal whose properties have
been changed due to the heat of welding
When an arc is formed between two electrodes
electricity flows from negative cathode to positive anode
The magnetic pinch force helps in the process of the detaching the molten metal
drops from the electrode tip. The magnetic force
increases as the square of the current causing smaller and smaller droplets to be
detached
The electric current for welding must be transformed from
High voltage, low amperage to low voltage, high amperage
The major advantage of electron beam welding process is
full penetration welds on thick material in one pass
The progress of welding with Electroslag welding process is
Vertical up
Explosion welding
is solid state process in which coalescence is produced through high speed
impacting of two or more materials by controlled detonation
A typical application for thermite welding is
joining of rails
Welding without filler metal with GTAW process is referred to as
autogenous welding
A typical weld flaw associated with GTAW process is
porosity
SMAW power sources typically have a volt-ampere curve that is
drooping
,Once a box of E49XX low hydrogen electrodes has been opened the electrodes
may remain at ambient temperature for up to a maximum of
4 hours
Shielded Metal ARC Welding (SMAW) process
establishes an arc between the end of a covered electrode and the work piece.
The spray mode of metal transfer is achieved with
high amperage, high voltage and argon-rich shielding gas
digital wire feeders
have feedback systems to maintain the preset wire feed speed
wire designated by CSA standard W48 as an E491T-9MJ-H8
Results in weld deposit with a maximum of 8 ml diffusible hydrogen per 100 g of
weld metal
Self shield flux cored wires are
better able to tolerate air currents
The AWS classes metal cored wire along with
solid wires
SAW Fluxes that significantly influence the composition of the weld metal through
slag/metal reactions are called
active
Resistance welding of aluminum
Can be done but with greater difficulty due to its low resistivity
The plasma arc welding process is similar to what other welding process in
principles of operation
GTAW
For a flat weld profile and good penetration profile using the MCAW process
15 degree travel angle using push technique should be used
What is the effect of tip to work distance (electrical sickout on deposition rate of
submerged are welding
decreasing tip to work distance without adjusting any other variable will cause a
increase in deposition rate
Electrode stick out is measured
From tip of nozzle to end of electrode
Contact tip-to-work is the sum (CTTW)
of the electrode extension and arc length
,Increasing electrical sickout
decreases voltage, decreases current and increases resistance
Which welding process for GMAW has large weld pool and is rather large and
difficult to control out of position
Spray transfer
Which welding process for GMAW has excessive spatter
Globular transfer
Which welding process for GMAW usually has lack of fusion
Short Circuit
what electrodes never go in holding or baking oven
cellulosic
Submerged Arc Welding disadvantage
Requires inter-pass and post weld slag removal
What welding process has the greatest HAZ
Electroslag
GTAW when a BALL is formed on Tungsten
Aluminum
Which welding process can be done outside Earth's atmosphere
Diffusion
With tungsten arc, most of the current across the arc is carried by
electrons
Electrode beam welding has
a very narrow weld and heat affected zone
Which gases are used with the GMAW process
argon and CO2 and their mixtures in various proportions
Which welding process is non-consumable electrode process
GTAW
Which shielding gas does GMAW use for spray transfer
95% Argon and 5% CO2
The deposition rate of SMAW electrodes is increased by including
Iron Power
Electrode in Flux cored are welding is
, Tubular wire containing flux or other ingredients
What welding process is not used in overhead position
SAW (Submerged Arc Welding
SAW Fluxes that significantly influence the composition of the weld metal through
slag/metal reactions are called
are classified in conjunction with welding wire forming a flux designation
A welding arc consists of a
high current and low voltage
The heat of the welding arc is used to
locally melt the base material and filler material to create fusion upon
solidification
Welding using GTAW process with current set to DCEN
30% arc heat at the electrode and 70% arc heat at the work
The function of the ingredients in the electrode coating of SMAW electrodes is to
provide a gas shield, slag covering, scavengers, arc stabilization and additional
alloying elements
The temperature for holding low hydrogen electrodes
120 C
The GMAW process uses (Blank) to shield the molten weld from the atmosphere
external shielding gas
The flux cored arc welding is an arc welding process usually in the semi-automatic
mode, consisting of:
A constant current power supply, a continuous speed wire feeder, a welding gun,
and a continuous filler metal electrode with a hallow core containing flux and
other ingredients
Welding is process a joining process that by definition requires application of
Either heat or pressure
Name the two main methods of arc shielding
flux shielding and gas shielding
Which direction do the electrons flow in an electrical are
Cathode to anode
In are welding, the electric are is intensely hot with temperature exceeding
30,000 C
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