Guide to Fillet Weld Symbols

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Guide to Fillet Weld Symbols

Overview

Dimensions of fillet welds must be shown on the same side of the reference line as the weld symbol (A, fig. 3-27).

When fillet welds are indicated on both sides of a joint and no
general note governing the dimensions of the welds appears on the
drawing, the dimensions are indicated as follows:

  1. When both welds have the same dimensions, one or both may be dimensioned (B or C, fig. 3-27).
  2. When the welds differ in dimensions, both must be dimensioned (D, fig. 3-27).

When fillet welds are indicated on both sides of a
joint and a general note governing the dimensions of the welds appears
on the drawing, neither weld need be dimensioned. However, if the
dimensions of one or both welds differ from the dimensions given in the
general note, both welds must be dimensioned (C or D, fig. 3-27).

Dimensions of Fillet Welds – Figure 3-27

 

Symbols for Size of Fillet Welds

The size of a fillet weld must of a fillet weld be shown to the left of the weld symbol (A, fig. 3-27).

The size the fillet weld with unequal legs must be
shown in parentheses to left of the weld symbol. Weld orientation is not
shown by the symbol and must be shown on the drawing when necessary (E,
fig. 3-27).

Unless otherwise indicated, the deposited fillet weld size must not be less than the size shown on the drawing.

When penetration for a given root opening is
specified, the inspection method for determining penetration depth must
be included in the applicable specification.

Length of Fillet Welds

The length of a fillet weld, when indicated on the welding symbol,
must be shown to the right of the weld symbol (A through D, fig. 3-27).

When fillet welding extends for the full distance
between abrupt changes in the direction of the welding, no length
dimension need be shown on the welding symbol.

Specific lengths of fillet welding may be indicated by symbols in conjunction with dimension lines (fig. 3-28).

Combined Intermittent and Continuous Welds - Figure 3-27

 

Extent of Fillet Welding

Use one type of hatching (with or without definite lines) to show the extent of fillet welding graphically.

Fillet welding extending beyond abrupt changes in
the direction of the welding must be indicated by additional arrows
pointing to each section of the joint to be welded (fig. 3-29) except
when the weld-all-around fillet weld symbols are used.

Extent of Fillet Welds

Fillet Weld on 3 Sides, No Weld at Corners - Figure 3-29

Dimensioning of Intermittent Fillet Welding

The pitch (center-to-center spacing) of intermittent fillet welding
shall be shown as the distance between centers of increments on one side
of the joint.

The pitch of intermittent fillet welding shall be shown to the right of the length dimension (A, fig 3-27).

Dimensions of chain intermittent fillet welding must
be shown on both sides of the reference line. Chain intermittent fillet
welds shall be opposite each other (fig. 3-30).

Symbols for Dimensions of Chain Intermittent Fillet Welds

 

Dimensions of staggered intermittent fillet welding must be shown on
both sides of the reference line as shown in the fillet weld symbols pictured in figure 3-31.

Dimensions of Staggered Intermittent Fillet Welds

 

Unless otherwise specified, staggered intermittent fillet welds on both sides shall be symmetrically spaced as in the fillet weld symbols in figure 3-32.

Length and Pitch of Increments of Staggered Intermittent Welding

Applications of Dimensions to Intermittent Fillet Weld Symbols
If required by actual length of the joint, the length of the increment of the welds at the end of the joint should be increased to terminate the weld at the end of the joint.

Termination of Intermittent Fillet Welding

When intermittent fillet welding is used by itself, the symbol
indicates that increments are located at the ends of the dimensioned
length.

When intermittent fillet welding is used between
continuous fillet welding, the symbol indicates that spaces equal to the
pitch minus the length of one increment shall be left at the ends of
the dimensioned length.

Separate symbols must be used for intermittent and
continuous fillet welding when the two are combined along one side of
the joint (fig. 3-28).

Surface Contour of Fillet Welds

Fillet welds that are to be welded approximately flat, convex, or
concave faced without recourse to any method of finishing must be shown
by adding the flush, convex, or concave contour symbol to the weld
symbol, in accordance with the location specifications given here (A, fig. 3-33).

Surface Contour of Fillet Welds

Finish symbols used here indicate the method of finishing (" c" = chiping, "G" = grinding, "H" = hammering, "M" = machining), not the degree of finish.

Fillet welds that are to be made flat faced by mechanical means must
be shown by adding both the flush contour symbol and the user's standard
finish symbol to the weld symbol, in accordance with location
specifications given in paragraph 3-7 (B, fig. 3-33).

Fillet welds that are to be mechanically finished to
a convex contour shall be shown by adding both the convex contour
symbol and the user's standard finish symbol to the weld symbol, in
accordance with location specifications given in paragraph 3-7 (C, fig.
3-33
).

Fillet welds that are to be mechanically finished to
a concave contour must be shown by adding both the concave contour
symbol and the user's standard finish symbol to the weld symbol in
accordance with location specification given here.

In cases where the angle between fusion faces is
such that the identification of the type of weld and the proper weld
symbol is in question, the detail of the desired joint and weld
configuration must be shown on the fillet weld symbols on the drawing.

References for Fillet Weld Symbols

A Review of Welding Symbols

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Page Author: Jeff Grill