ADDITIONAL WELDING SYMBOL ELEMENTS
12 июня, 2014 
Oleg Maloletnikov A knowledge of the other elements added to the welding symbol and their placement is required before welding symbols on prints can be interpreted properly.
Each element applied to the basic welding symbol has a standard location with reference to the components of the welding symbol and to the other elements that are added to it. Figure 10.11 illustrates the different elements that may be added to the welding symbols and where they are located with respect to the arrow tail and reference lines.
The specific elements to be applied to the welding symbol to denote the types of welds are illustrated in Figure 10.12.
A standard set of supplementary symbols may also be added to the basic welding symbols, Figure 10.13.
Figure 10.14 shows the kinds of basic weld symbols applied to a welding symbol and their location with respect to the reference line of the basic welding symbol. Note that all symbols do not have an arrow side, other side, or both sides application as illustrated by the spacer symbol. Also note that an arrow with a break is generally necessary with bevel and J-groove symbols. In cases where it is obvious which joint member is to be prepared, an arrow with a break is not required.
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"Used For ESW and EGW. ■"Back ct tacking is s^pectfied in tail of welding symbol having a single reference line. FIGURE 10.14 ■ Basic weld symbols and their location significance on the reference line. |
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OBSOLETE WELD SYMBOLS |
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Weld symbols are periodically revised to simplify the shape of the symbol, to consolidate several symbols into one, or to create a symbol to specify a newly developed welding technique. The weld symbols illustrated in Figure 10.15 are called obsolete symbols because they have been replaced by new symbols. These symbols are not used on current prints; however, they are included for reference in older prints. ri^. _ |
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PREFERRED SYMBOLS Field Weld, Weld-All-Around Symbols Welds extending continuously around the joint are indicated by placing the weld-all-around symbol at the break of the reference arrow line, Figure 10.16. Welds not made in the shop are identified as field welds and are indicated by placing the field weld symbol ^ or ^ at the break in the reference arrow line. Note that the flag of the field weld symbol may point in either direction with respect to the arrow of the welding symbol, Figure 10.17. A field weld symbol and the weld-all-around symbol may be used together, Figure 10.17. |
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FIGURE 10.15 ■ Obsolete weld symbols. |
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0.16 ■ Application of weld-all-around symbol. |
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p— FIELD WELD, FILLET WELD |
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17----- WELD-ALL-AROUND, FILLET WELD |
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WELD-ALL-AROUND IN FIELD. FILLET WELD |
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FIGURE 10.17 ■ Weld-all-around and field weld symbol. |
Опубликовано в BLUEPRINT READING FOR WELDERS