GMAW PIPE WELDING TEST
Q: A ________________ power source is used for the gas metal arc welding process.
A: DC/CV (Direct Current / Constant Voltage)
Explanation: GMAW typically uses a DC power source with constant voltage to maintain a
stable arc and consistent metal transfer.
Q: In GMAW, the ___________________ is adjusted by either increasing or decreasing the wire
feed speed.
A: Amperage
Explanation: Amperage, which controls the welding current, is directly influenced by wire feed
speed because faster wire feed means more current and heat input.
Q: Wire feed speed is measured in _________________.
A: IPM (inches per minute)
Explanation: The speed at which the welding wire is fed into the weld pool is measured in inches
per minute.
Q: In GMAW, shielding gas flow rate is measured in;
A: Cubic feet per hour (CFH) or liters per minute (L/min)
Explanation: The gas flow protects the weld pool from contamination and is regulated in volume
per unit time, commonly CFH or L/min.
Q: When the pipe is in the horizontal fixed position, this is known as the ______________ or
____________ position.
A: 5G or Bell Hole
Explanation: The 5G position refers to a fixed horizontal pipe position where the pipe does not
rotate, and the welder works around the pipe. Bell hole refers to the excavation made to access
the pipe.
, Q: The pipe you are welding is at a 45°, what is this position called?
A: 6G
Explanation: The 6G position is a pipe welding position where the pipe is fixed at a 45-degree
angle, considered one of the most challenging welding positions.
Q: The ____________ method of metal transfer is used to deposit the root pass in this course.
A: Short Circuit
Explanation: Short circuit transfer allows better control of the weld pool and is often used for
root passes to avoid burn-through.
Q: Identify the parts of the following AWS electrode classification: ER 70S-6
A:
• ER: Electrode Rod
• 70: Minimum tensile strength of 70,000 psi
• S: Solid wire
• 6: Chemical composition and usability characteristics
Explanation: This classification defines the electrode type, mechanical properties, and chemical
suitability.
Q: Which welding code or standard are we following in this GMAW pipe welding course?
A: API Standard 1104
Explanation: API 1104 is the standard for welding pipelines and related facilities.
Q: According to the code we are using, what is the minimum and maximum reinforcement
allowed for root?
A: Flush to 1/16 inch
Explanation: Reinforcement refers to the excess weld metal above the pipe surface; for root
passes, it must be minimal to avoid stress concentration.
Q: According to the code we are using, what is the minimum and maximum reinforcement
allowed for the face?
A: Flush to 1/8 inch
Explanation: The face reinforcement limits ensure weld integrity and fatigue resistance.
Q: A ________________ power source is used for the gas metal arc welding process.
A: DC/CV (Direct Current / Constant Voltage)
Explanation: GMAW typically uses a DC power source with constant voltage to maintain a
stable arc and consistent metal transfer.
Q: In GMAW, the ___________________ is adjusted by either increasing or decreasing the wire
feed speed.
A: Amperage
Explanation: Amperage, which controls the welding current, is directly influenced by wire feed
speed because faster wire feed means more current and heat input.
Q: Wire feed speed is measured in _________________.
A: IPM (inches per minute)
Explanation: The speed at which the welding wire is fed into the weld pool is measured in inches
per minute.
Q: In GMAW, shielding gas flow rate is measured in;
A: Cubic feet per hour (CFH) or liters per minute (L/min)
Explanation: The gas flow protects the weld pool from contamination and is regulated in volume
per unit time, commonly CFH or L/min.
Q: When the pipe is in the horizontal fixed position, this is known as the ______________ or
____________ position.
A: 5G or Bell Hole
Explanation: The 5G position refers to a fixed horizontal pipe position where the pipe does not
rotate, and the welder works around the pipe. Bell hole refers to the excavation made to access
the pipe.
, Q: The pipe you are welding is at a 45°, what is this position called?
A: 6G
Explanation: The 6G position is a pipe welding position where the pipe is fixed at a 45-degree
angle, considered one of the most challenging welding positions.
Q: The ____________ method of metal transfer is used to deposit the root pass in this course.
A: Short Circuit
Explanation: Short circuit transfer allows better control of the weld pool and is often used for
root passes to avoid burn-through.
Q: Identify the parts of the following AWS electrode classification: ER 70S-6
A:
• ER: Electrode Rod
• 70: Minimum tensile strength of 70,000 psi
• S: Solid wire
• 6: Chemical composition and usability characteristics
Explanation: This classification defines the electrode type, mechanical properties, and chemical
suitability.
Q: Which welding code or standard are we following in this GMAW pipe welding course?
A: API Standard 1104
Explanation: API 1104 is the standard for welding pipelines and related facilities.
Q: According to the code we are using, what is the minimum and maximum reinforcement
allowed for root?
A: Flush to 1/16 inch
Explanation: Reinforcement refers to the excess weld metal above the pipe surface; for root
passes, it must be minimal to avoid stress concentration.
Q: According to the code we are using, what is the minimum and maximum reinforcement
allowed for the face?
A: Flush to 1/8 inch
Explanation: The face reinforcement limits ensure weld integrity and fatigue resistance.
