Weld Symbol Questions
Common questions about welding symbols per AWS A2.4. What the letters, numbers, and markings mean on engineering drawings.
AWS A2.4 governs how welding symbols are drawn and read on engineering drawings. Every element of the symbol — the reference line, arrow, weld symbol, dimensions, tail, and supplementary symbols — has a defined meaning. The questions below cover the most commonly misread parts of a welding symbol, with answers sourced directly from A2.4. For a full visual reference, see the weld symbol chart.
G
What does G mean on a weld symbol?Grinding and finishing designators per AWS A2.4
↓
Arrow side vs. other side — what is the difference?Below the reference line = arrow side. Above = other side.
⌐
What is the broken arrow on a weld symbol?On bevel, J-groove, and flare-bevel welds: points to the member that must be prepared — A2.4 §6.4.1
#
What do the numbers on a weld symbol mean?Fillet weld: size to the left, length and pitch to the right — A2.4 §8.2.1
tail
What does the tail of a weld symbol mean?Process code, WPS number, or spec reference. Omit if unused — A2.4 §6.12
CJP
What does an undimensioned groove weld symbol mean?No depth or size on a groove symbol = complete joint penetration required — A2.4 §7.2.2
≠
What is the difference between a weld symbol and a welding symbol?The weld symbol is the shape (triangle, V). The welding symbol is the entire assembly — A2.4 §4.1
Related Reference