Power Engineering 2-A2 - Part 2 Exam
2025 Questions and Answers
What is a Back weld? What is Backing? - CORRECT ANSWER✔️✔️-Back weld: A weld applied
to the back side (root side) of a single groove weld AFTER the main weld has been completed.
Purpose of this weld is reinforcement and fills where the main weld did not penetrate
Backing: Applied to the back side of a single groove weld BEFORE the main weld is started. Its
purpose is to fill the root opening and prevent melt through
What is the purpose of Surfacing welds? - CORRECT ANSWER✔️✔️-- To increase the thickness
of the of the surface for strengthening or anticipation of corrosion purposes. *No joining of pieces*
What is an Edge Weld? - CORRECT ANSWER✔️✔️-- Used to join 2 pieces along their adjacent,
exposed edges
What is the purpose of the reference line on a Welding Symbol? - CORRECT ANSWER✔️✔️--
Contains any tags, symbols, notations that describe the type, dimensions, location of the weld.
Purpose of the Arrow on a welding symbol? - CORRECT ANSWER✔️✔️-- Joins the reference
line to the joint at which the weld will be applied.
- Stem should not be horizontal
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
,Direction that the arrow points (up or down) in a welding symbol is irrelevant. True or False? -
CORRECT ANSWER✔️✔️-True
What is the purpose of the Tail in a welding symbol? - CORRECT ANSWER✔️✔️-- Attached to
the opposite end of the arrow and contains supplemental information that is necessary for the
welder to know; information that isn't included in the reference line is contained here
The tail of a welding symbol is optional and may be left off. True or False? - CORRECT
ANSWER✔️✔️-True
The arrow side and the reference line are important pieces of information for what reason? -
CORRECT ANSWER✔️✔️-These 2 things inform the welder which side of a joint the weld must
be applied to
Any information BELOW the reference line must be applied to the ARROW side of the joint. True
or False? - CORRECT ANSWER✔️✔️-This is true. Any information located ABOVE the
reference line is applied to the OTHER side of the joint.
BELOW>ARROW
ABOVE>ABOTHER>OTHER
Weld symbol for Melt Through? - CORRECT ANSWER✔️✔️-- Root weld that extends beyond
the surface at the bottom of a groove weld
- Solid black half dome symbol
- *always placed above the reference side because it always occurs on the OTHER side*
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
,Weld symbol for a Field Weld? - CORRECT ANSWER✔️✔️-- A black flag pointing away from
the arrow indicates a weld that has to be performed in its final location (not in a shop)
Symbol for an 'All Around Weld'? - CORRECT ANSWER✔️✔️-- A circle at the end of a
reference line
Weld symbol for Backing? - CORRECT ANSWER✔️✔️-- Rectangular hollow box above the
reference line which indicates a flat surfaced piece is to be placed on the back side of a root weld.
This piece normally remains in place
Weld symbol for a Spacer? - CORRECT ANSWER✔️✔️-- A rectangular box that straddles the
reference line.
- Spacers are used in between the members of a groove weld (butt joints). It acts as backing and
keeps the joint root open during welding
Weld symbol for a Consumable Insert? - CORRECT ANSWER✔️✔️-- SQUARE box placed on
top of the reference line
- Indicates a filler material should be used to the weld joint to add strength
3 possible symbols for Weld Contour? - CORRECT ANSWER✔️✔️-- Either a flat, convex or
concave line is placed above the reference line. If the weld can't be completed with the desired
contour naturally then machining or grinding may be necessary
Information that can be contained on the reference line for Groove Weld Symbols? - CORRECT
ANSWER✔️✔️-- In addition to the basic weld symbol, information like specific sizing and
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 3
, shaping of the joint surfaces, depth of penetration, use of backing, thickness of melt-through, etc.
may also be included.
Welding symbols for fillet welds include what information? - CORRECT ANSWER✔️✔️--
Location of the weld
- Size of the weld
- Surface finish required
For lap (fillet) weld symbols, which side is the vertical ALWAYS on? - CORRECT
ANSWER✔️✔️-- Vertical side is always on the left; angled side is always on the right.
"3 - 5" What would these numbers mean in a welding symbol? - CORRECT ANSWER✔️✔️--
Staggered or in line welds where the individual welds are 3" long and the pitch distances are 5" apart
(centre to centre)
Mechanical vibrations can be propagated only in solid objects. True or False? - CORRECT
ANSWER✔️✔️-False, these sound waves can be detected in solids, liquids and gases.
Sounds wave range that is audible to the regular human ear? - CORRECT ANSWER✔️✔️-10 Hz -
20 000 Hz. Above 20 000 Hz is considered ultrasonic.
What is the Ultrasonic Principle based on? - CORRECT ANSWER✔️✔️-- Based on the fact that
solid materials are good conductors of sound waves.
- These sound waves are reflected at interfaces within the object as well as internal flaws (material
separations/inclusions)
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 4
2025 Questions and Answers
What is a Back weld? What is Backing? - CORRECT ANSWER✔️✔️-Back weld: A weld applied
to the back side (root side) of a single groove weld AFTER the main weld has been completed.
Purpose of this weld is reinforcement and fills where the main weld did not penetrate
Backing: Applied to the back side of a single groove weld BEFORE the main weld is started. Its
purpose is to fill the root opening and prevent melt through
What is the purpose of Surfacing welds? - CORRECT ANSWER✔️✔️-- To increase the thickness
of the of the surface for strengthening or anticipation of corrosion purposes. *No joining of pieces*
What is an Edge Weld? - CORRECT ANSWER✔️✔️-- Used to join 2 pieces along their adjacent,
exposed edges
What is the purpose of the reference line on a Welding Symbol? - CORRECT ANSWER✔️✔️--
Contains any tags, symbols, notations that describe the type, dimensions, location of the weld.
Purpose of the Arrow on a welding symbol? - CORRECT ANSWER✔️✔️-- Joins the reference
line to the joint at which the weld will be applied.
- Stem should not be horizontal
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 1
,Direction that the arrow points (up or down) in a welding symbol is irrelevant. True or False? -
CORRECT ANSWER✔️✔️-True
What is the purpose of the Tail in a welding symbol? - CORRECT ANSWER✔️✔️-- Attached to
the opposite end of the arrow and contains supplemental information that is necessary for the
welder to know; information that isn't included in the reference line is contained here
The tail of a welding symbol is optional and may be left off. True or False? - CORRECT
ANSWER✔️✔️-True
The arrow side and the reference line are important pieces of information for what reason? -
CORRECT ANSWER✔️✔️-These 2 things inform the welder which side of a joint the weld must
be applied to
Any information BELOW the reference line must be applied to the ARROW side of the joint. True
or False? - CORRECT ANSWER✔️✔️-This is true. Any information located ABOVE the
reference line is applied to the OTHER side of the joint.
BELOW>ARROW
ABOVE>ABOTHER>OTHER
Weld symbol for Melt Through? - CORRECT ANSWER✔️✔️-- Root weld that extends beyond
the surface at the bottom of a groove weld
- Solid black half dome symbol
- *always placed above the reference side because it always occurs on the OTHER side*
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 2
,Weld symbol for a Field Weld? - CORRECT ANSWER✔️✔️-- A black flag pointing away from
the arrow indicates a weld that has to be performed in its final location (not in a shop)
Symbol for an 'All Around Weld'? - CORRECT ANSWER✔️✔️-- A circle at the end of a
reference line
Weld symbol for Backing? - CORRECT ANSWER✔️✔️-- Rectangular hollow box above the
reference line which indicates a flat surfaced piece is to be placed on the back side of a root weld.
This piece normally remains in place
Weld symbol for a Spacer? - CORRECT ANSWER✔️✔️-- A rectangular box that straddles the
reference line.
- Spacers are used in between the members of a groove weld (butt joints). It acts as backing and
keeps the joint root open during welding
Weld symbol for a Consumable Insert? - CORRECT ANSWER✔️✔️-- SQUARE box placed on
top of the reference line
- Indicates a filler material should be used to the weld joint to add strength
3 possible symbols for Weld Contour? - CORRECT ANSWER✔️✔️-- Either a flat, convex or
concave line is placed above the reference line. If the weld can't be completed with the desired
contour naturally then machining or grinding may be necessary
Information that can be contained on the reference line for Groove Weld Symbols? - CORRECT
ANSWER✔️✔️-- In addition to the basic weld symbol, information like specific sizing and
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 3
, shaping of the joint surfaces, depth of penetration, use of backing, thickness of melt-through, etc.
may also be included.
Welding symbols for fillet welds include what information? - CORRECT ANSWER✔️✔️--
Location of the weld
- Size of the weld
- Surface finish required
For lap (fillet) weld symbols, which side is the vertical ALWAYS on? - CORRECT
ANSWER✔️✔️-- Vertical side is always on the left; angled side is always on the right.
"3 - 5" What would these numbers mean in a welding symbol? - CORRECT ANSWER✔️✔️--
Staggered or in line welds where the individual welds are 3" long and the pitch distances are 5" apart
(centre to centre)
Mechanical vibrations can be propagated only in solid objects. True or False? - CORRECT
ANSWER✔️✔️-False, these sound waves can be detected in solids, liquids and gases.
Sounds wave range that is audible to the regular human ear? - CORRECT ANSWER✔️✔️-10 Hz -
20 000 Hz. Above 20 000 Hz is considered ultrasonic.
What is the Ultrasonic Principle based on? - CORRECT ANSWER✔️✔️-- Based on the fact that
solid materials are good conductors of sound waves.
- These sound waves are reflected at interfaces within the object as well as internal flaws (material
separations/inclusions)
FOR STUDY PURPOSES ONLY COPYRIGHT © 2025 ALL RIGHTS RESERVED 4
