19 December 2008

[yim245] Welding Symbols on Drawings-Gregory-Armstrong

Symbols for indicating welded joints on engineering drawings were originally devised by individual drawing offices to provide more useful information than a simple arrow with the instruction ‘weld here’. This practice was obviously unsatisfactory, especially when drawings were passed from one company to another and, to solve this problem, the numerous symbols in existence were rationalized to some extent by countries compiling their own standard specifications for welding symbols.
It is important to appreciate the purpose of welding symbols,which is mainly to transmit information from the designer to one or more persons along the quality system network. This includes the welding engineer, welding supervisors, welders, inspection personnel and inspectors. In many cases it would be unfair to expect the designer to provide all the information possible from welding symbols without the help of a welding engineer and possibly from other welding and inspection personnel.
Weld symbols on drawings was originally published in 1982 based on BS 499 (British Standards Institution 1980), ISO 2553 (International Standards Organisation 1979) and ANSI/AWS A2.4 (American Welding Society-1979) standards. These standards have been through numerous revisions over the last few years; and the current standards are ISO 2553 1992, BSEN 22553 1995, and ANSI/AWS A2.4 1998. The American system of symbolisation is currently used by approximately half of the worldأ¢â‚¬â„¢s industry. Most of the rest of the world use ISO. The British system was standardised in 1933 and the latest of five revisions was published in 1995 as BSEN 22553, which is identical to ISO 2553. For many years an ISO committee has been working on combining ISO and AWS to create a combined worldwide standard, but while discussions continue this could take many years to achieve.


The standards
1. The need to specify welds
2. The advantages of symbols
3. Welding symbols 1:
butt/groove welds
4. Welding symbols 2:
fillet weld Edge weld, Backing run or weld, Flare-V groove and bevel welds, Plug
or slot weld

5. Welding symbols 3 :
spot and seam welds, Surfacing and Steep flanked butt welds
6. Location of symbols 1:
butt/groove welds
7. Location of symbols 2:
fillet welds
8. Supplementary symbols
Contour welds, COnvex contour, concave contour, toes blended smoothly,
other suppementary symbols, spacers, back weld and bacing weld, melt
through, consumable insert, Periperhal welds (weld all round), Field or site weld,
Backing strip or backing

9. Dimensions 1:
Butt/groove welds, Partial penetration welds, Groove dimensions, Length of
butt/groove welds

10. Dimensions 2:
Fillet welds – transverse, Deep penetration welds, Double fillet welds, Unequal
leg length fillet welds

11. Dimensions 3: Fillet welds, longitudinal
12. Spot and seam welds
Resistance spot welds, Arc spot welds, Projection welds, Seam welds
13. Stud welds
14. Surfacing
Multiple Layers
15. Process identification
16. Nondestructive testing symbols, AWS
17. Exercises in the use of symbols
Exercise 1: Flange ended pipe
Exercise 2: Vessel
Exercise 3: Tank
Exercise 4: Beam
Exercise 1 solution
Exercise 2 solution 1
Exercise 2 solution 2
Exercise 3 solution
Exercise 4 solution
Terms and definitions for welding symbols

# Title : Welding Symbols on Drawings
# Author : E.N. Gregory (Editor), A.A. Armstrong (Editor)
# Paperback: 72 pages
# Publisher: CRC; 1 edition (April 20, 2005)
# Language: English
# ISBN-10: 0849335914
# ISBN-13: 978-0849335914

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