Introduction

Welding symbols graphically convey complete information about a weld or braze joint. This is accomplished in a standardized and abbreviated picture format which makes easily used in every country around the world. The complete symbol system is described in ANSI/AWS A2.4, Standard Symbols for Welding, Brazing, and Nondestructive Testing, latest edition, published by American Welding Society. Everything the welder, architect, inspector, engineer, supervisor, foreman and construction superintendent need to know about a weld is described on a welding symbol.

Symbol Information

What information is included on a welding symbol?

• Joint type

• Weld preparation shape

• Weld type

• Welding process

• Specifications or procedures

• Weld location

• Extent of welding

• Quality requirements and method of testing

• Weld sequencing

• Weld size

• Final weld configuration

• Production methods

Symbol Elements

What are the parts of a welding symbol?

A welding symbol's parts may include the following elements:

• Reference line

• Arrow

• Basic weld symbol

• Dimensions and other data

• Supplementary symbols

• Finish symbols

• Tail

• Specifications, process, or other references

Reference Line

What is a reference line?

The reference line is a required part of a completed welding symbol it consists of a line drawn horizontally with all of the other required information drawn on or around it. It must be placed on the drawing near the joint the attached weld symbol describes. Each of the other welding symbol elements must be placed in there proper location about the reference line, and according to the...