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WorksheetsMaintenance welding 3
Total questions: 35
Worksheet time: 18mins
Once the GMAW gun cylinder is in place, it should be chained to prevent it from
Tipping
Leaking
Losing pressure
Venting
EK705-6,70 is the GMAW wire designation for that
Gauge of the welding wire
Tensile strength of the welding wire
Type of deoxidizers applied to the wire
Type of welding wire
What determines the wire thickness in GMAW wedding?
The type of metal being welded
The metal thickness
The shielding gas used
All of the above
When choosing welding wire for GMAW welding, look for
metal type, metal thickness, and shielding gas type
welding type, metal type, wire diameter
shielding gas and pressure
gas type, metal type, and ambient temperature
When removing old welding wire, the contact tip and nozzle should not be disturbed
True
False
Proper wire tension prevents wire from tangling when being spooled to the welding gun
True
False
How is GMAW welding amperage controlled
With an amperage knob
With a voltage knob
by wire feed speed
By the type of welding wire
Thicker metal requires, ____ IN GMAW welding
Higher voltage and higher wire feed setting
Lower voltage but higher wire feed setting
Lower voltage and lower wire feed setting
higher voltage but lower wire feed setting
The initial wire feed and voltage settings are selected based on the experience level of the operator
True
False
Where should you get information for setting up for GMAW welding
The welding equipment manufacturer data sheets
Rule of thumb guidelines learned in basic welding school
Trial and error on scrap material
Journeymen welders
In Gas Metal Arc Welding (GMAW) terminology, DCEP means
Direct Circuit Electrical Protection
Direct Currant Electrical Production
Dominant Current Energy Polarity
Direct Current Electrode Positive
A common reason for GMAW wire not feeding is _____ build up around the welding nozzle
Carbon
Whiskers
Spatter
Welding dust
The main consideration in selecting GMAW tips and nozzles is _____
Which tips and nozzles produce the minimum amount of spatter
Threaded or non-threaded
Steel or aluminum construction
AC or DC welding current
The main consideration in selecting GMAW tips and nozzles is _____
Which tips and nozzles produce the minimum amount of spatter
Threaded or non-threaded
Steel or aluminum construction
AC or DC welding current
The main consideration in selecting GMAW tips and nozzles is _____
Which tips and nozzles produce the minimum amount of spatter
Threaded or non-threaded
Steel or aluminum construction
AC or DC welding current
A welding bead is _____
the line of metal resulting from the welding
a temporary weld used in place of a clamp
the portion of the metal to be welded
a segment of a welded join that is unsuitable
A tack weld involves placing a small weld at each of the joint being welded and every few inches in between
True
False
A tack weld involves placing a small weld at each of the joint being welded and every few inches in between
True
False
A tack weld involves placing a small weld at each of the joint being welded and every few inches in between
True
False
How long should each bead be when performing a tack weld
As small as possible
Less than 1/8in
About 1/2in
About 1 in
J grove weld is named for the shape that is cut out of the base metal's edge
True
False
_____ is not a valid welding position
Vertical
Overhead
backhand
Flat
When welding a groove weld in the horizontal position the welding gun should be aimed _____
toward the top center of the joint
toward the bottom of the joint
directly in the center of the joint
45 degrees toward the top of the joint
a butt joint uses a groove weld to join two pieces of metal that are placed _____
overlapping one another
meeting in a corner
meeting in a tee
end-to-end
A good GMAW bead should
Have fine or no spatter
Be of uniform width
Have good penetration into base metal
All of the above
A long SMAW arc means _____
The weld will likely be porous and weak
A wider gap can be filed
A stronger weld is produced
A wider puddle wil be formed
If metal is not cleaned between weld passes it can result in
Slag inclusions
Porosity
Incomplete fusion
Excessive spatter
What is a common cause of an undercut weld defect
Excessive weld current
Incorrect filler metal
Insufficient filler metal deposited
All of the above
What weld defect reduces the cross-sectional thickness of the base metal
Undercut
Inclusion
cold lap
Burn through
When inspecting a weld with porosity you might see
small cracks on the root side of the weld
erosion on the toe of the weld
extrusions of wire electrode that sticks through the root of the weld
small holes on the surface of the weld
When there is slag or flux in the weld it called a _____ defect
Undercut
Inclusion
Cold lap
Burn through
Which of these terms does NOT refer to a welding defect
Penetration
Porosity
Inconsistent bead
Undercut
Two common penetration flaws are _____
lack of penetration, bum through
whisker and, porosity
uneven height and uneven bead
undercutting and inconsistent width
Incomplete fusion occurs when _____
pockets of hydrogen and nitrogen are trapped in the weld puddle
the welding electrode melts entirely through the metal
the metal is not melted deep enough to create a strong weld
the weld does not fuse properly causing a weld to be weak
Three factors that may cause a weld to crack are
insufficient weld size, poor joint design or preparation, and dirty base metal
whiskers, uneven bead, and porosity
proper joint design, sufficient weld size, and clean base metal
too large weld bead, whiskers, and unsteady hand
