Review Question 2025 Exams: Welding
Principles and Applications 7th Chapter
2 | Questions and Answers
Which welding technique is best suited for joining dissimilar metals?
Brazing.
What is the main benefit of using pulse welding in GMAW?
It provides better control over heat input, reducing distortion.
What is the term for the distance from the base metal to the tip of the welding electrode?
Arc length.
Which welding defect is characterized by the presence of gas pockets in the weld?
Porosity.
What is the purpose of post-weld heat treatment?
To relieve residual stresses and improve mechanical properties.
What does the term "duty cycle" mean in relation to welding equipment?
The percentage of time a welding machine can operate continuously without overheating.
What is the primary purpose of the flux in arc welding?
1
, To shield the molten weld pool from atmospheric contamination.
Which welding process uses a consumable electrode fed through a welding gun?
Gas Metal Arc Welding (GMAW).
Why is preheating sometimes necessary before welding certain metals?
To reduce the risk of cracking by lowering the thermal gradient.
What is the main advantage of Gas Tungsten Arc Welding (GTAW) over other welding
processes?
It produces high-quality welds with precise control over heat input.
What type of current is typically used for welding aluminum with GTAW?
Alternating Current (AC).
Which material property is most critical to consider when selecting a welding process?
Thermal conductivity.
What is the role of shielding gas in welding?
To protect the weld area from oxidation and contamination.
Why are low-hydrogen electrodes often used in shielded metal arc welding?
2
, To minimize the risk of hydrogen-induced cracking.
What is the primary difference between fusion welding and solid-state welding?
Fusion welding melts the base materials, while solid-state welding joins materials without
melting.
What is the most common joint design for welding thick plates?
Beveled butt joint.
What is the primary function of the electrode in arc welding?
To carry electrical current and provide filler metal.
What is the most commonly used shielding gas for welding stainless steel?
Argon or a mixture of argon and helium.
Which welding process uses a non-consumable tungsten electrode?
Gas Tungsten Arc Welding (GTAW).
What is the effect of increasing the travel speed during welding?
It reduces the heat input and can lead to undercut or incomplete fusion.
Why is back purging necessary when welding stainless steel pipes?
3
Principles and Applications 7th Chapter
2 | Questions and Answers
Which welding technique is best suited for joining dissimilar metals?
Brazing.
What is the main benefit of using pulse welding in GMAW?
It provides better control over heat input, reducing distortion.
What is the term for the distance from the base metal to the tip of the welding electrode?
Arc length.
Which welding defect is characterized by the presence of gas pockets in the weld?
Porosity.
What is the purpose of post-weld heat treatment?
To relieve residual stresses and improve mechanical properties.
What does the term "duty cycle" mean in relation to welding equipment?
The percentage of time a welding machine can operate continuously without overheating.
What is the primary purpose of the flux in arc welding?
1
, To shield the molten weld pool from atmospheric contamination.
Which welding process uses a consumable electrode fed through a welding gun?
Gas Metal Arc Welding (GMAW).
Why is preheating sometimes necessary before welding certain metals?
To reduce the risk of cracking by lowering the thermal gradient.
What is the main advantage of Gas Tungsten Arc Welding (GTAW) over other welding
processes?
It produces high-quality welds with precise control over heat input.
What type of current is typically used for welding aluminum with GTAW?
Alternating Current (AC).
Which material property is most critical to consider when selecting a welding process?
Thermal conductivity.
What is the role of shielding gas in welding?
To protect the weld area from oxidation and contamination.
Why are low-hydrogen electrodes often used in shielded metal arc welding?
2
, To minimize the risk of hydrogen-induced cracking.
What is the primary difference between fusion welding and solid-state welding?
Fusion welding melts the base materials, while solid-state welding joins materials without
melting.
What is the most common joint design for welding thick plates?
Beveled butt joint.
What is the primary function of the electrode in arc welding?
To carry electrical current and provide filler metal.
What is the most commonly used shielding gas for welding stainless steel?
Argon or a mixture of argon and helium.
Which welding process uses a non-consumable tungsten electrode?
Gas Tungsten Arc Welding (GTAW).
What is the effect of increasing the travel speed during welding?
It reduces the heat input and can lead to undercut or incomplete fusion.
Why is back purging necessary when welding stainless steel pipes?
3
