metal transfer & gas
limited to flat and horizontal, must have DCEP with at least 80% Argon
Spray transfer
what limits current output at short-circuit?
slope
what prevents the weld puddle from oxidizing
slag
good abrasion, metal to metal wear at high temperatures
high speed steel
removes metal by gouging or grinding
abrasion
mode of metal transfer that runs between 22 and 26 volts
Globular
which type of wire-feeder is used with a CP power source
constant speed feeder
what is the result of increased wire feed speeds
increased deposition
good resistance to impact wear; work hardens; widely used on chutes
austenitic manganese steels
pounding, battering type of wear
impact
this shielding gas is reactive and the cylinder should be changed when pressure falls to 150 psi. and why does the cylinder need changing at this pressure rating?
Carbon dioxide. the bottom two thirds is liquid, if drawn out could freeze regulators
what does inductance help manage
How long it takes for slope to peak
primary cause of incomplete penetration
insufficient current
the hardest hard-surfacing material, most abrasion resistance, poor impact resistance due to extreme hardness
tungsten carbides
gouging type of wear that washes away or grooves the metal surface
erosion
what gas mixture is sometimes used with FCAW. and. what causes spatter with CO2
argon/CO2 mix is sometimes used
cathode jet is responsible for spatter with CO2
what will increases in arc length produce
decrease in the burn off rate
what component can be checked to control porosity
make sure the wire is centered in the nozzle
retains hardness at elevated temperatures, often used on seal rings
nickel-chromium alloys
wear that pits, perforates and eventually dissolves metal parts
Corrosion
this mode of metal transfer uses slope to limit current output
short-circuit transfer
what is the unique feature of constant voltage power sources in regards to arc length
self-correcting arc length
which variable category does wire stick-out fall under
secondary adjustable
good resistance to corrosion and metal to metal wear
copper alloys (not on test)
exposing metal parts to rapid heating and cooling cycles
thermal shock