Several applications of the melt-thru symbol are shown in Figure 14.5 and Figure 14.6. In Figures 14.5(a) through (c), the melt-thru symbol is used with a groove weld. However, it can also be used for flange welds as in Figure 14.7(a) and (b). The melt-thru symbol is used in the same manner and has the same significance for flange welds as it does for groove welds.

WELDED FROM THIS SIDE

FLANGED EDGE JOINT

(a)

CORNER FLANGE

(b)

FIGURE 14.7 ■ Applications of melt-thru symbol with edge welds.

UNIT 14: REVIEW

Graph paper is provided at the end of this review for your use.

1. a. What types of welds are used with back or 7. Draw the welding symbol required for the

backing welds? following welds:

b. Identify the types of welds to which melt - thru symbols may be applied.

■BACK WELD

2. How may the back weld be distinguished from a backing weld?

3. Sketch the welding symbols to indicate the following welds. Include a square groove weld symbol with the back and backing weld symbols.

a. Back weld

b. Backing weld

c. Melt-thru weld

d. Arrow side square groove weld with a removable backing

4. Explain each part of the following welding symbol.

GRIND,

Sketch the welds required as indicated by the following welding symbols for A. and B. below. Indicate the sequence of welds on the sketch and identify each weld symbol.

a. Should the reference CJP be included in sketch B?

b. Explain your answer.

Arrow side:

Other side:

5. a. Are size dimensions generally shown for back or backing welds?

b. What dimension may be given with a melt - thru weld symbol?