BlueprintExercises

Welding symbols chart

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Welding symbols chart

Basic weld symbols (drawn on the arrow side)

Fillet weld
Square-groove weld
ISO: Square butt weld
V-groove weld
ISO: Single-V butt weld
Bevel-groove weld
ISO: Single-bevel butt weld
U-groove weld
ISO: Single-U butt weld
J-groove weld
ISO: Single-J butt weld
Plug or slot weld
Spot weld

Arrow side and other side

AWS / ISO B: below = arrow side
AWS / ISO B: above = other side
ISO A: on solid line = arrow side
ISO A: on dashed line = other side

Sizes, lengths and marks

1/42-6
AWS: 1/4 leg, 2 in welds, 6 in pitch
a53 × 50 (100)
ISO: a = throat, z = leg; n × l (e)
Circle = all around, flag = field weld

Size left of the symbol, length right. a5 throat needs about 7 mm legs (leg = throat x 1.414). blueprintexercises.com