Welding Symbols on Drawings

Welding Symbols on Drawings
E. N. Gregory and A. A. Armstrong
Contents
Contents v
Introduction vii
Scope ix
Standards referred to in this book x
Terms and definitions xi
1 The need to specify welds 1
2 The advantages of symbols 3
3 Welding symbols 1 6
Butt/groove welds 6
4 Welding symbols 2 9
Fillet and edge welds, backing run or weld,
flare groove and bevel welds, and plug or slot weld 9
5 Welding symbols 3 11
Spot and seam welds, surfacing, and steep flanked
butt welds 11
6 Location of symbols 1 13
Butt/groove welds 13
7 Location of symbols 2 14
Fillet welds 14
8 Supplementary symbols 16
Contours of welds 17
Convex contour 18
Concave contour 19
Toes blended smoothly 19
Other supplementary symbols 20
Spacer 20
Back weld and backing weld 20
Melt through 21
Consumable insert 21
Peripheral welds (weld all round) 22
Field or site weld 22
Backing strip or backing 23
9 Dimensions 1 24
Butt/groove welds 24
Partial penetration welds 25
Groove dimensions 25
Length of butt/groove welds 27
10 Dimensions 2 28
Fillet welds – transverse 28
Deep penetration welds 29
Double fillet welds 29
Unequal leg length fillet welds 3011 Dimensions 3 31
Fillet welds – longitudinal 31
12 Spot and seam welds 34
Resistance spot welds 34
Arc spot welds 35
Projection welds 35
Seam welds 36
13 Stud welds 37
14 Surfacing 39
Multiple layers 39
15 Process identification 40
16 Non-destructive testing symbols – AWS 42
17 Exercises 44
Exercise 1: Flange ended pipe 44
Exercise 2: Vessel 45
Exercise 3: Tank 46
Exercise 4: Beam 47
Exercise 1 solution 48
Exercise 2 solution 1 49
Exercise 2 solution 2 51
Exercise 3 solution 53
Exercise 4 solution 55

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