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7/28/2019 Welding Symbols 1
http://slidepdf.com/reader/full/welding-symbols-1 1/23
PowerPoint ® Presentation
Chapter 4
Welding Symbols
Weld Specification on Prints • Weld
Joints • Weld Types • Welding
Symbols • Edge Preparation •
Brazing Symbols • NondestructiveExamination (NDE) Symbols
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Chapter 4 — Welding Symbols
Object dimensions and
welding symbols on a print
convey fabrication
information to the welder.
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Chapter 4 — Welding Symbols
A weld is specified with a
welding symbol and is
completed by the welder
using the specified process.
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Chapter 4 — Welding Symbols
The five basic weld joints
are the butt, lap, T, edge,
and corner weld joints.
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Chapter 4 — Welding Symbols
Weld types are classified by the
cross-sectional shape of the weld.
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Chapter 4 — Welding Symbols
Groove welds are
classified by the edge
shape of the
joint members.
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Chapter 4 — Welding Symbols
Fillet welds are triangular
in cross-sectional shape.
They transfer loads to
joint members positioned
at 90° to one another.
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Chapter 4 — Welding Symbols
Plug and slot welds provide
strength without affecting the
edges of the joint members.
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Chapter 4 — Welding Symbols
Stud welds permanently join
threaded fasteners to parts
using heat and pressure.
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Chapter 4 — Welding Symbols
The size of spot and projection welds is the diameter
of the weld nugget. The size of seam welds is the
diameter of the weld nugget and length of the weld.
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Chapter 4 — Welding Symbols
Back welds are deposited on the opposite side of the
part after the groove weld is made. Backing welds
are deposited on the opposite side of the part before
the groove weld is made.
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Chapter 4 — Welding Symbols
Surfacing welds are commonly
used to build up worn parts.
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Chapter 4 — Welding Symbols
Edge welds are commonly used on
thin materials where filler metal is
not required.
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Chapter 4 — Welding Symbols
Welding symbols provide standardized information
regarding welding and examination requirements.
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Chapter 4 — Welding Symbols
The arrow of the welding
symbol points to the location
of the weld specified.
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Chapter 4 — Welding Symbols
The reference line divides the
welding symbol into the arrow
side and the other side.
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Chapter 4 — Welding Symbols
Weld symbols on the welding
symbol indicate the type of
weld required.
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Chapter 4 — Welding Symbols
Dimensions included in the
welding symbol specify weld
size and location requirements.
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Chapter 4 — Welding Symbols
Information in the tail of the
welding symbol pertains to
weld specification, weld
process, or other reference.
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Chapter 4 — Welding Symbols
Supplementary symbols
provide additional
information regarding the
weld required.
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Chapter 4 — Welding Symbols
The arrow of the welding
symbol is broken if a
specific joint member
requires edge preparation.
If either joint member canbe prepared, the arrow is
not broken.
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Chapter 4 — Welding Symbols
Brazing symbols show the brazing processdesignation in the tail.
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Chapter 4 — Welding Symbols
Nondestructive
examination (NDE)
symbols can be part of a
welding symbol or a
separate NDE symbol.