Ch30 Welding Symbols Teacher

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WeldingPrinciples and PracticesThird Edition

Sacks and Bohnart

1

WeldingSymbols

Chapter 30



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Objectives

1. Know the name of the AWS standard forwelding symbols

2. List the eight elements that may be found on awelding symbol

3. List the basic weld symbols4. List the supplementary symbols5. Name the five basic joints6. Identify the applications of the different weld

symbols



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American Welding Society

• Material in this chapter reprinted throughcourtesy of AWS

– Symbols include latest revision• For more detailed reference

– Booklet Standard Symbols for Welding, Brazing,and Nondestructive Examination (AWS A2.4-98)

•

Published by the AWS• Many companies develop own system of

symbols, references with AWS as base



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ANS Symbol System

• Joint – Basis of reference

• Welded joint indicated by symbol will havearrow side and other side

• Use tail of reference line for givingspecifications for welding

– Welding process; type and brand of filler metal;where or not peening, chipping or preheatingrequired and other information



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Welding Symbol Components

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Examples of Arrow Symbols




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AWS Standard

• Weld symbol – Graphic symbol that indicates weld required

•

Welding symbol – Following eight elements:

• Reference line (required)• Arrow (required)• Basic weld symbols• Dimensions and other data

• Supplementary symbols• Finish symbols• Tail• Other specifications

Standard welding symbols given in Table30-1



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Basic Weld Symbols


AWS



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Basic Weld Symbols


AWS



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Welding Symbols


AWS



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Filet Welds and Symbol

• Fillet weld triangular-shaped weld placed on the joint

•

Fillet weld symbol triangular in shape – Vertical line of fillet weld symbol always drawn to

left of symbol – Size always shown to left of symbol and length to

right of symbol• No length given, then weld should run full length of joint



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Examples:Fillet Welds on T-Joints




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Example: Fillet Weld Lengthand Pitch Indications




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Weld-All-Around Symbol

• Used when weld is to extend all way around joint or series of connected joints

• Symbol: circle viewable at junction ofreference line and arrow




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Groove Welds

• Seven types of groove welds and symbols torepresent them

– Square – V – Bevel – U –

J – Flare-V – Flare-bevel

Symbols take the shapeof the groove the weld

is to be placed in.



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Groove Welds

• Place in a joint• Used to make butt joints, but can be used to

make other types of joints• Double bevel

– One of joint members has bevel on both sides and joint is to be welded from both sides

– V shape



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V-groove Weld on Butt Joint




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Double V-groove Weldon Butt Joint




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Contour Symbol

• Desired shape of weld shown on weldingsymbol

•

Located above imaginary face of weld forgroove weld symbols and above side oftriangle that most closely represents face ofweld

– Flat: straight line – Concave and convex: takes on that shape



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Contour Symbol and LettersWhich Indicate Finishing Method

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Ch30 Welding Symbols Teacher