Additional reference lines may be applied to the basic welding symbol to show: (1) a sequence of welding operations where the first opera­tion must be completed before the next can be performed and (2) supplementary symbols applicable to the weld symbol shown on the first reference line. Note that the first reference line is the one located closest to the arrow, Figure 10.31(a, b, and c).

When multiple reference lines are applied to the basic welding symbol, the weld-all-around and field weld symbols may be added to one or all of the reference lines. Tails may be added similarly, Figure 10.32.

WELDING

ABBREVIATIONS

Standard abbreviations or letter designations for the various welding processes developed by the AWS are universally accepted by the welding industry.

The welder will find these standard abbrevia­tions on prints used for the fabrication of weld - ments. Table 10.1, Table 10.2, and Table 10.3 illustrate the letter designations used for welding processes, cutting processes, and the methods of applying these processes. These letter desig­nations are used with welding symbols or are included in the notes on prints. Note that the abbreviation for each welding process ends with the letter “W” and for each cutting process with the letter “C”.

FIGURE 10.31(a) ■ Sequence of operations signified by multiple reference lines.

FIGURE 10.31(c) ■ Application of supplementary data to second reference line.

FIGURE 10.32 ■ Application of field weld symbol, and tails to multiple reference line.

TABLE 10.3 ■ Letter designations for applying welding processes.

Note: These suffixes may be used if it is desired to indicate the methods of applying the welding processes, Figure 10.36.

Figure 10.33 shows how letter designations for welding processes are applied to welding sym­bols. Note that in each case the letters are located in the tail of the arrow.

When a contour symbol is used, an abbre­viation for the method of finish may be included, Figure 10.34. All letters shown on prints do not necessarily represent letter designations or abbre­viations. For example, letters can be used with specifications, Figure 10.35. In this case, the letter “A” has no significance except to identify the specification to which reference is made.

There are other occasions when letters are used solely for identification purposes. As weld­ers become familiar with reading prints, they will be able to distinguish between the letters applied as abbreviations and those used to iden­tify specifications.