ACTIVITY #2
MIDTERM
NAME Gutierrez, Gionathan O. SCORE
COURSE BSIT – Mechanical Technology DATE 11 – 04 – 2023
Direction: Search the different welding symbols. Make a chart/table with their corresponding meanings.
Strictly typewritten.
Welding cannot take its proper place as an engineering tool unless means are provided for
conveying the information from the designer to the workmen (Grill, 2023). Learning and knowing
your welding symbols well is equally important as learning to weld properly since welding
symbols provide the means of placing complete welding information on drawings (Grill, 2023;
Mason, 2023).
Commonly Used Weld Symbols Use
The most used weld.
These are welds used to form
overlapping joints using holes in
which welds get deposited.
Done similarly to the seam
except that these welds are done
in a singular spot
They are made using high heat
input and are made in linear
form.
Second most used. It usually
involves preparing the edge
pieces to form one of the groove
weld shapes like V, bevel, U, J,
Flare V, Flare bevel or no
preparation at all with square
edges to form a square groove.
Supplemental Symbols Use
They use the same symbol but are
different. The backing weld is
deposited before the actual weld in
the groove. Something like a pre-
weld. The back weld on another
hand goes after the actual weld.
Something like giving the weld a
good back.
Indicates that the root of the weld
needs to be reinforced.
Specifies the welds that are made
over the entire surface of the piece.
Designates the backing bar to be
used on the back of the weld. If it
has R in it, it should be removed
after welding.
This symbol indicates the type and
the dimension of the spacer that is
inserted between the welded
pieces.
It signals that the weld is to be
made over the entire
circumference.
Field weld/Made on site.
These symbols designate the final
weld end product contour.
Structure of Welding Symbol
The Reference Line
The Arrow The Tail
Reference lines are important
welding symbols drawn as a
The arrow is the main element of straight line horizontally across the The tail is the third weld symbol
weld symbols. The arrow line drawing. The reference line arrow part. It is drawn at the end of the
points towards the place that is also contains additional details reference line opposite the arrow.
supposed to be welded. The stem about the welding itself. It can It usually contains information for
of the arrow should not be contain some valuable information which there is no provision
depicted as a horizontal line on the like the joint design, the weld elsewhere. The tail can provide
drawing. pattern, the weld size, etc. info about the welding process, the
reference document, and the
Being that welding symbols Both the upper and the lower examination process.
specify the joint that the arrow side reference line have the same
is pointing towards as well as a elements for both sides. The main However, the tail doesn’t have to
change of direction and a change difference is the info about where be there, it depends on the need
of geometry of the end of the joint one actually needs to weld. The for additional information. If
a multiple arrow welding symbol lower part is a narrow side where provisional info is not relevant, the
can be added. the arrow indicates what side to tail is omitted.
weld based on the provided
elements. The elements given on
the upper part describe the other
side of the joint.
References
Grill, J. (2023, January 31). Welding Symbols: Diagrams & Types - Weld Guru. Weld Guru.
https://weldguru.com/welding-symbols/
Mason, A. (2023, October 2). Welding Symbols - types, example diagrams, free PDF charts.
WeldingPros - Welding Career Guide, How To and Gear Reviews.
https://weldingpros.net/welding-symbols/
