Welding Symbols Chapter 30

Objectives Know the name of the AWS standard for welding symbols List the eight elements that may be found on a welding symbol List the basic weld symbols List the supplementary symbols Name the five basic joints Identify the applications of the different weld symbols

American Welding Society Material in this chapter reprinted through courtesy 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

ANS Symbol System Joint Basis of reference Welded joint indicated by symbol will have arrow side and other side Use tail of reference line for giving specifications for welding Welding process; type and brand of filler metal; where or not peening, chipping or preheating required and other information

Welding Symbol Components Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

Examples of Arrow Symbols Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

AWS Standard Weld symbol Welding 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 Table 30-1

Basic Weld Symbols AWS Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

Basic Weld Symbols AWS Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

Welding Symbols AWS Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

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

Examples: Fillet Welds on T-Joints Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

Example: Fillet Weld Length and Pitch Indications Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

Weld-All-Around Symbol Used when weld is to extend all way around joint or series of connected joints Symbol: circle viewable at junction of reference line and arrow Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

Symbols take the shape of the groove the weld is to be placed in. Groove Welds Seven types of groove welds and symbols to represent them Square V Bevel U J Flare-V Flare-bevel Symbols take the shape of the groove the weld is to be placed in.

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

V-groove Weld on Butt Joint Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

Double V-groove Weld on Butt Joint Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.

Contour Symbol Desired shape of weld shown on welding symbol Located above imaginary face of weld for groove weld symbols and above side of triangle that most closely represents face of weld Flat: straight line Concave and convex: takes on that shape

Contour Symbol and Letters Which Indicate Finishing Method Copyright © The McGraw-Hill Companies, Inc. Permission required for reproduction or display.