Millwright Journeyman Certification | Welding, Cutting, Metallurgy & Machining | 2026/2027
MILLWRIGHT JOURNEYMAN CERTIFICATION
Industrial Mechanic – Apprentice to Journeyman
WELDING, CUTTING, METALLURGY, AND MACHINING
JOURNEYMAN CERTIFICATION EXAMINATION
150+ Multiple-Choice, True/False, and Practical Application Questions
Verified Correct Answers with Detailed Rationales
Latest 2026/2027 Edition | Graded A+
TABLE OF CONTENTS
Section Topic Page
1 Welding Processes 3
2 Cutting Processes 7
3 Metallurgy Fundamentals 10
4 Heat Treatment Processes 14
5 Metal Identification & Testing 17
6 Machine Tools 19
7 Cutting Tool Geometry & 23
Materials
Page 1
, Millwright Journeyman Certification | Welding, Cutting, Metallurgy & Machining | 2026/2027
8 Speeds & Feeds Calculations 26
9 Precision Measurement 28
10 Fits & Tolerances 31
11 Thread Standards 33
12 Metallurgical Defects & 35
Prevention
13 Weld Inspection & Testing 37
14 Welding Metallurgy 39
15 Safety Protocols 41
Section 1: Welding Processes
___________________________________________________________________
_____________
1. In SMAW (Shielded Metal Arc Welding), the electrode coating serves which
primary functions?
A. Provides only electrical insulation
B. Stabilizes the arc, shields the molten puddle with gas, and provides flux to
clean the weld metal
C. Acts only as a filler metal binder
D. Increases welding speed by conducting more current
Rationale: The electrode coating in SMAW serves multiple critical functions: it stabilizes the arc
by providing ionizing elements, produces a shielding gas (primarily CO₂) that protects the molten
weld pool from atmospheric contamination, and forms a slag layer that further shields the cooling
weld and can be chipped away after solidification. The coating also may contain alloying elements
and iron powder to enhance weld metal properties.
2. Which welding process uses a continuous solid wire electrode and an externally
supplied shielding gas?
A. SMAW (Stick welding)
B. GMAW (Gas Metal Arc Welding)
C. GTAW (Gas Tungsten Arc Welding)
D. Oxyacetylene welding
Page 2
, Millwright Journeyman Certification | Welding, Cutting, Metallurgy & Machining | 2026/2027
Rationale: GMAW (also called MIG welding) uses a continuously fed solid wire electrode and an
external shielding gas supply (typically 75% argon/25% CO₂ for steel, or 100% argon for
aluminum). The wire serves as both the electrode and the filler metal, and the shielding gas
protects the weld pool from atmospheric nitrogen and oxygen absorption.
3. FCAW (Flux-Cored Arc Welding) differs from GMAW in that FCAW:
A. Requires a tungsten electrode
B. Uses a tubular wire electrode containing flux materials internally
C. Cannot be used outdoors
D. Always requires external shielding gas
Rationale: FCAW uses a tubular wire electrode with fluxing agents and alloying materials
contained within the hollow core. FCAW can be used in two modes: self-shielded (FCAW-S),
where the internal flux generates sufficient shielding gas for outdoor use without an external gas
supply, and gas-shielded (FCAW-G), where additional external shielding gas is used. FCAW-S is
particularly valued for outdoor construction welding.
4. GTAW (Gas Tungsten Arc Welding) uses which type of electrode?
A. Consumable coated electrode
B. Non-consumable tungsten electrode
C. Continuous solid wire
D. Tubular flux-cored wire
Rationale: GTAW (TIG welding) uses a non-consumable tungsten electrode that creates the arc
but does not melt into the weld puddle. Filler metal, when needed, is added manually from a
separate rod. The tungsten electrode is available in pure tungsten, thoriated (2% ThO₂), ceriated,
and lanthanated varieties, each suited for different materials and current types. Shielding is
provided by an external inert gas (argon or helium).
5. Which polarity is most commonly used for GTAW welding of aluminum with AC
current?
A. DCEN (Direct Current Electrode Negative)
B. DCEP (Direct Current Electrode Positive)
C. AC (Alternating Current) balanced wave
D. DC straight polarity only
Page 3
, Millwright Journeyman Certification | Welding, Cutting, Metallurgy & Machining | 2026/2027
Rationale: AC current is used for GTAW welding of aluminum because the electrode-positive
(DCEP) half-cycle provides cathodic cleaning action that breaks up the refractory aluminum oxide
layer, while the electrode-negative (DCEN) half-cycle provides penetration into the base metal.
Modern TIG power supplies offer adjustable AC balance controls to optimize the ratio between
cleaning and penetration for different aluminum thicknesses.
6. Brazing differs from welding in that brazing:
A. The base metal melts during the process
B. Only occurs at temperatures below 840°F (450°C) and the base metal does
not melt
C. The filler metal is always ferrous
D. It can only join similar metals
Rationale: Brazing is defined as a joining process occurring above 840°F (450°C) but below the
melting point of the base metal. The filler metal is distributed between closely fitted surfaces by
capillary action. Unlike welding, the base metal does not melt during brazing. This distinction is
important because brazing produces less thermal distortion and can join dissimilar metals that
would be incompatible in welding.
7. Soldering is performed at temperatures below which threshold?
A. Below 840°F (450°C)
B. Below 1100°F (593°C)
C. Below 500°F (260°C)
D. Below 1500°F (816°C)
Rationale: Soldering is a joining process performed at temperatures below 840°F (450°C),
distinguishing it from brazing. Soldering uses filler metals with lower melting points (typically
tin-lead or tin-silver alloys) and relies on capillary action to distribute the filler between joint
surfaces. Soldering is widely used in electrical connections, plumbing, and sheet metal work
where minimal heat input is essential.
8. In oxyacetylene welding, which type of flame is used for welding most steels?
A. Carburizing (reducing) flame
B. Neutral flame
C. Oxidizing flame
D. Any flame type produces equivalent results
Page 4
MILLWRIGHT JOURNEYMAN CERTIFICATION
Industrial Mechanic – Apprentice to Journeyman
WELDING, CUTTING, METALLURGY, AND MACHINING
JOURNEYMAN CERTIFICATION EXAMINATION
150+ Multiple-Choice, True/False, and Practical Application Questions
Verified Correct Answers with Detailed Rationales
Latest 2026/2027 Edition | Graded A+
TABLE OF CONTENTS
Section Topic Page
1 Welding Processes 3
2 Cutting Processes 7
3 Metallurgy Fundamentals 10
4 Heat Treatment Processes 14
5 Metal Identification & Testing 17
6 Machine Tools 19
7 Cutting Tool Geometry & 23
Materials
Page 1
, Millwright Journeyman Certification | Welding, Cutting, Metallurgy & Machining | 2026/2027
8 Speeds & Feeds Calculations 26
9 Precision Measurement 28
10 Fits & Tolerances 31
11 Thread Standards 33
12 Metallurgical Defects & 35
Prevention
13 Weld Inspection & Testing 37
14 Welding Metallurgy 39
15 Safety Protocols 41
Section 1: Welding Processes
___________________________________________________________________
_____________
1. In SMAW (Shielded Metal Arc Welding), the electrode coating serves which
primary functions?
A. Provides only electrical insulation
B. Stabilizes the arc, shields the molten puddle with gas, and provides flux to
clean the weld metal
C. Acts only as a filler metal binder
D. Increases welding speed by conducting more current
Rationale: The electrode coating in SMAW serves multiple critical functions: it stabilizes the arc
by providing ionizing elements, produces a shielding gas (primarily CO₂) that protects the molten
weld pool from atmospheric contamination, and forms a slag layer that further shields the cooling
weld and can be chipped away after solidification. The coating also may contain alloying elements
and iron powder to enhance weld metal properties.
2. Which welding process uses a continuous solid wire electrode and an externally
supplied shielding gas?
A. SMAW (Stick welding)
B. GMAW (Gas Metal Arc Welding)
C. GTAW (Gas Tungsten Arc Welding)
D. Oxyacetylene welding
Page 2
, Millwright Journeyman Certification | Welding, Cutting, Metallurgy & Machining | 2026/2027
Rationale: GMAW (also called MIG welding) uses a continuously fed solid wire electrode and an
external shielding gas supply (typically 75% argon/25% CO₂ for steel, or 100% argon for
aluminum). The wire serves as both the electrode and the filler metal, and the shielding gas
protects the weld pool from atmospheric nitrogen and oxygen absorption.
3. FCAW (Flux-Cored Arc Welding) differs from GMAW in that FCAW:
A. Requires a tungsten electrode
B. Uses a tubular wire electrode containing flux materials internally
C. Cannot be used outdoors
D. Always requires external shielding gas
Rationale: FCAW uses a tubular wire electrode with fluxing agents and alloying materials
contained within the hollow core. FCAW can be used in two modes: self-shielded (FCAW-S),
where the internal flux generates sufficient shielding gas for outdoor use without an external gas
supply, and gas-shielded (FCAW-G), where additional external shielding gas is used. FCAW-S is
particularly valued for outdoor construction welding.
4. GTAW (Gas Tungsten Arc Welding) uses which type of electrode?
A. Consumable coated electrode
B. Non-consumable tungsten electrode
C. Continuous solid wire
D. Tubular flux-cored wire
Rationale: GTAW (TIG welding) uses a non-consumable tungsten electrode that creates the arc
but does not melt into the weld puddle. Filler metal, when needed, is added manually from a
separate rod. The tungsten electrode is available in pure tungsten, thoriated (2% ThO₂), ceriated,
and lanthanated varieties, each suited for different materials and current types. Shielding is
provided by an external inert gas (argon or helium).
5. Which polarity is most commonly used for GTAW welding of aluminum with AC
current?
A. DCEN (Direct Current Electrode Negative)
B. DCEP (Direct Current Electrode Positive)
C. AC (Alternating Current) balanced wave
D. DC straight polarity only
Page 3
, Millwright Journeyman Certification | Welding, Cutting, Metallurgy & Machining | 2026/2027
Rationale: AC current is used for GTAW welding of aluminum because the electrode-positive
(DCEP) half-cycle provides cathodic cleaning action that breaks up the refractory aluminum oxide
layer, while the electrode-negative (DCEN) half-cycle provides penetration into the base metal.
Modern TIG power supplies offer adjustable AC balance controls to optimize the ratio between
cleaning and penetration for different aluminum thicknesses.
6. Brazing differs from welding in that brazing:
A. The base metal melts during the process
B. Only occurs at temperatures below 840°F (450°C) and the base metal does
not melt
C. The filler metal is always ferrous
D. It can only join similar metals
Rationale: Brazing is defined as a joining process occurring above 840°F (450°C) but below the
melting point of the base metal. The filler metal is distributed between closely fitted surfaces by
capillary action. Unlike welding, the base metal does not melt during brazing. This distinction is
important because brazing produces less thermal distortion and can join dissimilar metals that
would be incompatible in welding.
7. Soldering is performed at temperatures below which threshold?
A. Below 840°F (450°C)
B. Below 1100°F (593°C)
C. Below 500°F (260°C)
D. Below 1500°F (816°C)
Rationale: Soldering is a joining process performed at temperatures below 840°F (450°C),
distinguishing it from brazing. Soldering uses filler metals with lower melting points (typically
tin-lead or tin-silver alloys) and relies on capillary action to distribute the filler between joint
surfaces. Soldering is widely used in electrical connections, plumbing, and sheet metal work
where minimal heat input is essential.
8. In oxyacetylene welding, which type of flame is used for welding most steels?
A. Carburizing (reducing) flame
B. Neutral flame
C. Oxidizing flame
D. Any flame type produces equivalent results
Page 4
