UNIT 15Fillet Welds

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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.

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Fillet Weld• Approximately triangular• Actual throat– Shortest distance between weld root and

face of weld– Affects strength of weld

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Parts of a Fillet Weld

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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

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Fillet Weld with Unequal Legs

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Weld Length• Shown to right of weld symbol• Weld-all-around symbol– For all geometric shapes

• Round parts– Length may be given in degrees

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Weld Length Given in Degrees

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Hatching• Shows extent and location of fillet weld• Additional arrows used for abrupt changes

in weld direction

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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

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Intermittent Fillet Weld with Symbol

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Staggered Intermittent Fillet Weld with Symbol

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Fillet Welds in Holes or Slots

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Fillet Weld Contours• Specified when specific welded shape is

desired– Flat– Concave– Convex

• Indicated by contour symbol

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Combination Weld Symbols• Other types of welds can be used with fillet

welds• Fillet symbol and other weld symbol

included on welding symbol

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Example of Combination Weld Symbol