How do you indicate a field or site weld?

By placing a flag symbol at the junction of the arrow and reference line.

How do you indicate a weld on the arrow side?

Place the elementary weld symbol on the continuous reference line.

How do you specify a continuous weld all around a joint?

By placing a circle at the junction of the arrow line and the reference line.

What is the difference between prefix 'a' and 'z' for fillet welds?

Prefix 'a' specifies the design throat thickness, whereas 'z' specifies the leg length of the fillet weld.

IS 813

: 1986

Scheme of Symbols for Arc Welding

CurrentFrequently UsedTerminologyBIMStructural Engineering · Steel and Reinforcement

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IS 813 provides a standard scheme of symbols for representing arc welding on engineering drawings. It enables designers and draftspersons to communicate weld types, sizes, positions, and preparation details clearly to fabricators and site engineers.

Lays down the method for symbolic representation of welded joints on engineering drawings.

Quick Reference Values

Prefix 'a' for fillet weldThroat thickness

Prefix 'z' for fillet weldLeg length

Suffix 'l'Length of weld

Suffix 'e'Distance (pitch) between adjacent weld elements

Weld all around symbol locationJunction of arrow and reference line

Practical Notes

Symbols placed on the continuous reference line indicate a weld on the arrow side of the joint.

Symbols placed on the dashed reference line indicate a weld on the other side of the joint.

The tail of the symbol is optional and is used to specify a particular welding process, standard, or other special instructions.

For symmetric welds, the dashed line is omitted and symbols are placed on both sides of the continuous reference line.