CWB Module 4 Welding Processes
Exam Questions and Answers19
Active Flux - ANSWERS-significantly influence the weld puddle
- add manganese, silicon, chromium to weld metal
- typically bonded type flux
Arc Blow - ANSWERS-The deflection of an arc from its normal path due to magnetic forces.
Autogeneous Weld - ANSWERS-A fusion Weld made without filler metal
Duty Cycle - ANSWERS-The time during a ten-minute test period, expressed in percentage, that
a power source can operate at the rated output without overheating
Fused Flux - ANSWERS-A granular flux produced by mixing the ingredients, followed by melting,
cooling to the solid state and processing to produce the desired particle size
Heat Affected Zone (HAZ) - ANSWERS-The portion of the base metal adjacent to a weld which
has not been melted, but the metallurgical microstructure and mechanical properties have been
changed by the heat of welding, sometimes with undesirable effects.
Neutral Flux - ANSWERS-make minimal changes to the weld pool composition
Non Consumable Electrode - ANSWERS-An electrode that does not provide filler metal
,What are the eight categories that welding processes are grouped as? - ANSWERS-Arc Welding
(AW)
Solid State Welding (SSW)
Resistance Welding (RW)
Oxyfuel Gas Welding (OFW)
Soldering (S)
Brazing (B)
Other Wleding
Allied Processes (ie cutting & Thermal Spraying)
What are the two main methods of Arc Shielding? - ANSWERS-Flux Shielding
Gas Shielding
What direction do electrons flow? - ANSWERS-Negative to Positive
What Temperature is a welding arc? - ANSWERS-exceeding 30,000°C
Resistance Welding (RW) - ANSWERS-A type of welding in which welding occurs from the heat
obtained by resistance to the flow of current through the joined metals.
Anode - ANSWERS-Positively charged electrode
Cathode - ANSWERS-Negatively charged electrode
Arc Efficiency - ANSWERS-the portion of the energy that is available to melt the electrode/filler
metal and the work piece
, Direct Current - ANSWERS-an electric current flowing in one direction only.
Alternating Current (AC) - ANSWERS-electric current that reverses its direction of flow in a
regular pattern
Resistance heating - ANSWERS-As current flows through a conductor, heat is produced by the
resistance of the conductor. Conductor Length Increases Resistance. As Diameter Decreases so
does resistance.
Where beside the heating of consumables is the Arc Energy used up? - ANSWERS-Conduction,
Convection, Radiation, Spatter, etc
What is the Arc Efficiency of SAW? - ANSWERS-90% - 95%
What is the Arc Efficiency of SMAW, GMAW, FCAW? - ANSWERS-65% - 85%
What is the Arc Efficiency of GTAW? - ANSWERS-20% - 45%
What does a Transformer do? - ANSWERS-turns High Voltage, Low Amp Power into High Amp,
Low Volt Power
What causes the voltage drop over the electrode extension? - ANSWERS-Longer electrode
extension, smaller wire diameter and higher current
What is Arc Length related to? - ANSWERS-arc voltage
How does cable length effect the voltage? - ANSWERS-The longer the cables, the more voltage
drop
Exam Questions and Answers19
Active Flux - ANSWERS-significantly influence the weld puddle
- add manganese, silicon, chromium to weld metal
- typically bonded type flux
Arc Blow - ANSWERS-The deflection of an arc from its normal path due to magnetic forces.
Autogeneous Weld - ANSWERS-A fusion Weld made without filler metal
Duty Cycle - ANSWERS-The time during a ten-minute test period, expressed in percentage, that
a power source can operate at the rated output without overheating
Fused Flux - ANSWERS-A granular flux produced by mixing the ingredients, followed by melting,
cooling to the solid state and processing to produce the desired particle size
Heat Affected Zone (HAZ) - ANSWERS-The portion of the base metal adjacent to a weld which
has not been melted, but the metallurgical microstructure and mechanical properties have been
changed by the heat of welding, sometimes with undesirable effects.
Neutral Flux - ANSWERS-make minimal changes to the weld pool composition
Non Consumable Electrode - ANSWERS-An electrode that does not provide filler metal
,What are the eight categories that welding processes are grouped as? - ANSWERS-Arc Welding
(AW)
Solid State Welding (SSW)
Resistance Welding (RW)
Oxyfuel Gas Welding (OFW)
Soldering (S)
Brazing (B)
Other Wleding
Allied Processes (ie cutting & Thermal Spraying)
What are the two main methods of Arc Shielding? - ANSWERS-Flux Shielding
Gas Shielding
What direction do electrons flow? - ANSWERS-Negative to Positive
What Temperature is a welding arc? - ANSWERS-exceeding 30,000°C
Resistance Welding (RW) - ANSWERS-A type of welding in which welding occurs from the heat
obtained by resistance to the flow of current through the joined metals.
Anode - ANSWERS-Positively charged electrode
Cathode - ANSWERS-Negatively charged electrode
Arc Efficiency - ANSWERS-the portion of the energy that is available to melt the electrode/filler
metal and the work piece
, Direct Current - ANSWERS-an electric current flowing in one direction only.
Alternating Current (AC) - ANSWERS-electric current that reverses its direction of flow in a
regular pattern
Resistance heating - ANSWERS-As current flows through a conductor, heat is produced by the
resistance of the conductor. Conductor Length Increases Resistance. As Diameter Decreases so
does resistance.
Where beside the heating of consumables is the Arc Energy used up? - ANSWERS-Conduction,
Convection, Radiation, Spatter, etc
What is the Arc Efficiency of SAW? - ANSWERS-90% - 95%
What is the Arc Efficiency of SMAW, GMAW, FCAW? - ANSWERS-65% - 85%
What is the Arc Efficiency of GTAW? - ANSWERS-20% - 45%
What does a Transformer do? - ANSWERS-turns High Voltage, Low Amp Power into High Amp,
Low Volt Power
What causes the voltage drop over the electrode extension? - ANSWERS-Longer electrode
extension, smaller wire diameter and higher current
What is Arc Length related to? - ANSWERS-arc voltage
How does cable length effect the voltage? - ANSWERS-The longer the cables, the more voltage
drop
