Machine Drawing

162 Machine Drawing

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(i) Elementary symbols (Table 11.1),

(ii) Supplementary symbols (Table 11.2),

(iii) Combination of elementary and supplementary symbols (Table 11.3) and

(iv) Combination of elementary symbols (Table 11.4).

Corner joint

Edge joint

Tee joint Butt joint

Lap joint

Fig. 11.2 Types of joints

11.2.1 Position of the Weld Symbols on the Drawings

The complete method of representation of the welds on the drawing comprises, in addition to

the symbol (3), the following (Fig. 11.3):

2b

3

a5 300

4

2a

1

Joint

Fig. 11.3

(i) An arrow line (1) per joint,

(ii) A dual reference line, consisting of two parallel lines; one continuous and one dashed

(2a, 2b) and

(iii) A certain number of dimensions (4) and conventional signs (3).

NOTE The dashed line may be drawn either above or below the continuous line (Fig. 11.8). For

symmetrical welds, the dashed line is omitted.