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UNIT 15Fillet Welds
Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc.
Objectives
• Name the parts of a fillet weld.• Determine weld size and weld length
by interpreting the fillet welding symbol.
• Read and interpret a fillet welding symbol used for intermittent and staggered intermittent welds.
• Determine the weld face contour of a fillet weld.
Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc.
Fillet Weld• Approximately triangular• Actual throat– Shortest distance between weld root and
face of weld– Affects strength of weld
Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc.
Parts of a Fillet Weld
Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc.
Dimensions for Fillet Symbol• Dimension for arrow side fillet on arrow side
of reference line• Weld size – Shown to left of weld symbol– Specified dimension is minimum size unless
otherwise noted
Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc.
Fillet Weld with Unequal Legs
Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc.
Weld Length• Shown to right of weld symbol• Weld-all-around symbol– For all geometric shapes
• Round parts– Length may be given in degrees
Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc.
Weld Length Given in Degrees
Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc.
Hatching• Shows extent and location of fillet weld• Additional arrows used for abrupt changes
in weld direction
Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc.
Intermittent Fillet Welds• Intermittent weld– Broken by unwelded spaces
• Pitch– Distance between centers of increments on
one side of joint– Shown to right of length dimension
• Staggered intermittent weld– Weld increments staggered on both sides of
joint
Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc.
Intermittent Fillet Weld with Symbol
Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc.
Staggered Intermittent Fillet Weld with Symbol
Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc.
Fillet Welds in Holes or Slots
Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc.
Fillet Weld Contours• Specified when specific welded shape is
desired– Flat– Concave– Convex
• Indicated by contour symbol
Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc.
Combination Weld Symbols• Other types of welds can be used with fillet
welds• Fillet symbol and other weld symbol
included on welding symbol
Permission granted to reproduce for educational use only.© Goodheart-Willcox Co., Inc.
Example of Combination Weld Symbol
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