Fillet Welds

The fillet weld, identified by the symbol |^, is one of the most widely used types of welds. This symbol is always drawn so that the vertical leg is to the reader’s left, Figure 12.1.

SIZE OF THE LEGS

The size of a fillet weld refers to the length of the legs of the weld. The two legs are assumed to be equal in size unless otherwise specified. This size is shown to the left of the weld symbol, Figure 12.2. If a fillet is shown on both sides of the joint, it is identified as a double fillet weld. The size of the legs is indicated for each fillet weld as shown in Figure 12.3 and Figure 12.4.

Fillet welds may have unequal legs. In this case, the size of each leg is indicated in parentheses at the left of the weld symbol, Figure 12.5. Since the symbol does not specify which dimension belongs to which leg, this information must be detailed on the drawing.

When a general note covers the size of fillet welds, the dimension does not usually appear on the welding symbol. An example of a note of this type is: “Unless otherwise indicated, all fillet welds are 3/іб" in size.”

FIGURE 12.2 ■ Fillet weld size.

FIGURE 12.1 ■ Fillet weld symbol.

FIGURE 12.4 ■ Double fillet welds of different sizes.

SYMBOL SIGNIFICANCE

FIGURE 12.3 ■ Double fillet weld.

PLATE

SEE NOTE •

LEG (PLATE "B")

NOTE: 1/4" LEG ON PLATE "A" (PLATE "A”)

1/2" LEG ON PLATE "B"

SYMBOL SIGNIFICANCE

FIGURE 12.5 ■ Fillet welds with unequal legs.

FIGURE 12.6 ■ Length of fillet weld.

SYMBOL

FIGURE 12.7 ■ Length of fillet weld specified by standard dimensioning practice.

FIGURE 12.8 ■ Continuous fillet weld.

SYMBOL SIGNIFICANCE

WELD-

SYMBOL SIGNIFICANCE

FIGURE 12.9 ■ Weld-all-around symbol.

LENGTH OF FILLET WELDS

If the length of the weld is specified, it is placed on the immediate right of the weld symbol, Figure 12.6.

In addition, specific lengths of fillet welds can be described by placing the symbols in conjunction with the dimension lines of the drawing, Figure 12.7. Note that continuous welds are called for in each of the 5'-0" dimensions.

When a length is not specified on the welding symbol, the fillet weld is assumed to be continuous, Figure 12.8. In a similar manner, when the weld-all-around symbol is used, a length dimension is not needed, Figure 12.9.

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