Welding Symbols PDF

Welding Symbols  Welding Symbols There are two standards for welding symbols which are AWS & ISO. 1-Difinitions a- Weld symbols on drawings. A method of transferring information from the designer to the workshop B- Weld symbol Graphic symbol that indicates weld required C- Weldi...

Welding Symbols  Welding Symbols There are two standards for welding symbols which are AWS & ISO. 1-Difinitions a- Weld symbols on drawings. A method of transferring information from the designer to the workshop B- Weld symbol Graphic symbol that indicates weld required C- Welding symbol Following eight elements: 1- Reference line (required) 2- Arrow (required) 3- Basic weld symbols 4-Dimensions and other data 5- Supplementary symbols 6- Finish symbols 7- Tail 8- Other specifications 2- Welding Symbol Components 3- Advantages and disadvantages of welding symbolic representation. a- Advantages of symbolic representation: 1-simple and quick plotting on the drawing 2-does not over-burden the drawing 3-no need for additional view 4-gives all necessary indications regarding the specific joint to be obtained b- Disadvantages of symbolic representation: 1-used only for usual joints 2-requires training for properly understanding of symbols 4- Elementary Weld Symbols 4-1- Butt/groove welds 4-2- Fillet and edge welds, backing run or weld, flare groove and bevel welds, and plug or slot weld 4-3- Spot and seam welds, surfacing, and steep flanked butt welds 5- location of symbols In the ISO system the weld symbol on the arrow side is placed on the continuous line and the weld symbol on the other side is placed on the dashed line. In the AWS system the weld symbol on the arrow side is placed below the single continuous line and the weld symbol on the other side is placed above the line. 5-1- Butt/groove welds 5-2- Fillet welds 6- Supplementary symbols Additional information about a weld can be provided by supplementary symbols used in conjunction with those welds already described. In most cases, the same symbol is used in the ISO and AWS standards. In other cases, only one of the standards uses a symbol for a particular requirement. 7- Process identification In the ISO system the welding process to be used can be symbolized by a number written within the fork or tail at the end of the reference line, whereas in the AWS system letters are used instead of numbers.