62 Modern Welding penetration is required. See Figures 3-30 and 3-31 for examples of depth of bevel and groove weld size. 3.5.7 Length and Pitch of the Weld In many welded parts, it is not necessary to weld continuously from one end of the joint to the other. To save time and expense, where full strength is not required, short sections of weld may be spaced across the joint. This is called intermittent welding. On intermittent welds, the length dimension is used to indicate the length of each weld. The pitch dimension indicates the distance from the center of one weld segment to the center of the next. See Figure 3-32 for examples of such welds. The length and pitch dimensions are always shown to the right of the basic weld symbol on the welding symbol. When intermittent fi llet welds are required on both sides of a welding joint, they may be one of two types. One type is chain intermittent welding the other is staggered intermittent welding. The welds on either side of a chain intermittent weld begin and end at the same spot. The welds line up with each other on each side of the joint. The weld symbols also line up on each side of the reference line. Staggered intermittent welds are offset so the welded segments do not line up on each side of the joint. This is shown on the welding 3/8 (3/8) 1/8 60 5/8″ 60° A 1/8″ 3/8″ B .8″ .6″ D .5″ .5″ C .5 .5 (.6) 45 Figure 3-31. Groove weld size. Groove weld size or depth of penetration is shown in parentheses at A and C. Note, at B, that the groove weld size is less than the metal thickness. At D, it is greater than the depth of bevel. Figure 3-32. Length and pitch dimensions of weld. A—Note the placement of length (3) and pitch (6) specifi cations on the welding symbol. B—This image shows a series of 3″ long welds that are 6″ apart from center-to-center of the welds. C and D—Staggered weld. Notice staggered fi llet symbols in C. A B D C 1/8 3-6 2-4 2-4 3″ 3″ 6″ 6″ 4″ 4″ 4″ 2″ 2″ 2″ 2″ 2″ 3″