Welding Symbols 1

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Chapter 4

Welding Symbols

Weld Specification on Prints • Weld

Joints • Weld Types • Welding

Symbols • Edge Preparation •

Brazing Symbols • NondestructiveExamination (NDE) Symbols



Chapter 4 — Welding Symbols

Object dimensions and

welding symbols on a print

convey fabrication

information to the welder.




A weld is specified with a

welding symbol and is

completed by the welder

using the specified process.




The five basic weld joints

are the butt, lap, T, edge,

and corner weld joints.




Weld types are classified by the

cross-sectional shape of the weld.




Groove welds are

classified by the edge

shape of the

joint members.




Fillet welds are triangular

in cross-sectional shape.

They transfer loads to

joint members positioned

at 90° to one another.




Plug and slot welds provide

strength without affecting the

edges of the joint members.




Stud welds permanently join

threaded fasteners to parts

using heat and pressure.




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.




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.




Surfacing welds are commonly

used to build up worn parts.




Edge welds are commonly used on

thin materials where filler metal is

not required.




Welding symbols provide standardized information

regarding welding and examination requirements.




The arrow of the welding

symbol points to the location

of the weld specified.




The reference line divides the

welding symbol into the arrow

side and the other side.




Weld symbols on the welding

symbol indicate the type of

weld required.




Dimensions included in the

welding symbol specify weld

size and location requirements.




Information in the tail of the

welding symbol pertains to

weld specification, weld

process, or other reference.




Supplementary symbols

provide additional

information regarding the

weld required.




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.




Brazing symbols show the brazing processdesignation in the tail.




Nondestructive

examination (NDE)

symbols can be part of a

welding symbol or a

separate NDE symbol.

Welding Symbols 1

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