LENGTH AND PITCH OF GROOVE WELDS

The length of a groove weld is specified by placing the dimension to the right of the weld symbol, Figure 13.7.

The length and pitch (distance between centers) of intermittent welds are specified by placing the dimen­sions to the right of the weld symbol and are separated by a hyphen, Figure 13.8.

The length and pitch of intermittent welds are specified on both sides of a joint as shown in Figure 13.9. Note: Intermittent welds are also identified as chain intermittent welds.

When symbols are offset, the welds are identified as staggered intermittent welds, Figure 13.10.

6 - 10

/----------- ІЇ8-

6 SIGNIFIES LENGTH OF WELD 10 SIGNIFIES PITCH OF WELD

FIGURE 13.8 ■ Length and pitch dimensions.

к

4 - 6

4 - 6

С

-СШЮ—

—QJJJXD—

-nrrrm-

-mrrm-

I/ 4 - 6 l 4 - 6

SYMBOL

SYMBOL SIGNIFICANCE

FIGURE 13.9 ■ Intermittent welds on both sides.

SIGNIFICANCE

FIGURE 13.10 ■ Staggered intermittent welds on both sides.

ROOT OPENING OF GROOVE WELDS

The distance between the joint members at the bottom of the weld is called the root opening, Figure 13.11.

In many cases, manufacturers have standardized the root openings of groove welds so that they can be covered by a general note or specification. For example, “Unless otherwise indicated, root openings for all groove welds are 3/іб".”

FIGURE 13.11 Root opening.

ROOT OPENING

FIGURE 13.12 ■ Root opening applied to welding symbols.

FIGURE 13.13 ■ Root opening applied to other welding symbols.

When specified, the dimension for the root open­ing is located inside the weld symbol, Figure 13.12 and Figure 13.13. Note that for double groove welds the root opening need appear only once, Figure 13.12(b) and Figure 13.12(c). Note that when a root opening dimension is not given, the root opening is zero (0). A “0” may be used to indicate this, Figure 13.13(c).

GROOVE ANGLE

When the angle formed by the members to be welded is given, it is placed inside the weld symbol, Figure 13.14. If both the groove angle and the root open­ing are given, both dimensions should be placed as shown in Figure 13.15.

FIGURE 13.15 ■ Groove weld symbol showing use of combined dimensions.

FIGURE 13.14 ■ Groove angle designation.

CONTOUR AND FINISHING

The standard surface contour and finish symbols are added to the groove weld symbols as shown in Figure 13.16. Note that when a postweld finish is not speci­fied, the contour may be approximate in shape. Also, recall that the postweld method of finish is optional when the letter “U” (for unspecified) is used with the contour symbol. It signifies an unspecified method of finish.

GROOVE WELD COMBINATIONS

Groove weld symbols may be used in combination with one another or with other weld symbols, Figure 13.17. They are used to indicate a similar or different type of groove weld, or another type of weld, on opposite sides of the joint, Figure 13.17(a), (b), and (c).

Groove welds are also used with other weld symbols to indicate a sequence of welds required on the same side of the joint, Figure 13.17(d), and on both sides, Figure 13.17(e).

SYMBOL

-K-

SIGNIFICANCE

INDICATES SIMILAR GROOVE WELDS ON OPPOSITE SIDES OF THE JOINT

~T

b.

■*-

INDICATES DIFFERENT GROOVE WELDS ON OPPOSITE SIDES OF THE JOINT. CJP

BEVEL GROOVE S WELD

■ FILLET WELD

INDICATES A COMBINATION OF A BEVEL GROOVE WELD AND FILLET WELD

d.

SQUARE GROOVE WELD APPLIED FIRST

THEN FILLET WELD APPLIED TO REINFORCE SQUARE GROOVE WELD WITH COMPLETE JOINT PENETRATION

INDICATES SEQUENCE OF WELDS ON SAME SIDE OF JOINT

FIGURE 13.17 ■ Groove weld combinations.

e.

INDICATES J-GROOVE WELD AND FILLET WELD ON BOTH SIDES

FIGURE 13.18 ■ Use of groove symbols with multiple reference line welding symbol.

V

2ND OPERATION, GOUGE OPPOSITE SIDE OF BEVEL GROOVE WELD

. 1ST OPERATION, BEVEL GROOVE WELD (ARROW SIDE)

2ND OPERATION BACK GOUGE

BACK

.GOUGE

1ST OPERATION BEVEL GROOVE WELD

Figure 13.18 shows a groove weld symbol used with welding symbols having multiple reference lines.

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