Machine Drawing

166 Machine Drawing

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d:\N-Design\Des11-1.pm5

11.2.2 Conventional Signs

The two conventional signs used for welding as per BIS are a circle at the elbow (1), connecting

the arrow and the reference line to indicate welding all around and, by a filled-in circle (2) at

the elbow to indicate welding on site, as shown in Fig. 11.4a. These are shown, in addition to

the weld symbols of the joint to be made.

1

2

(a)

(b)

SAW

Fig. 11.4

Another convention as per International Standards Organisation, indicates the process

of welding. For this, the abbreviation of the welding process is written as a note at the tail end

of the arrow, forming a 90°V as shown in Fig. 11.4b. Here, SAW stands for submerged arc

welding (Table 11.6).

11.2.3 Location of Welds

The location of the welds is specified by the following:

(i) Position of the arrow line,

(ii) Position of the reference line and

(iii) Position of the symbol.

11.2.4 Position of the Arrow Line

The arrow line joins one end of the continuous reference line, such that it forms an angle with

it and is completed by an arrow head. Figure 11.5 shows the relation between the arrow line

Arrow

Other side

side

(a) Weld on the arrow side

Arrow

side

Other side

(b) Weld on the other side

Fig.11.5 Arrow side and other side (contd.)

and the joint. The terms ‘arrowside’ and ‘otherside’ (in case of fillet welding) are used with

respect to the continuous plate (Figs. 11.5 c and d). The position of the arrow line with respect