Weld Symbol Questions
Common questions about Simboli di Saldatura per AWS A2.4. What the letters, numbers, and markings mean on engineering drawings.
AWS A2.4 governs how Saldatura symbols are drawn and read on engineering drawings. Every element of the symbol — the reference line, arrow, Simbolo di Saldatura, 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 Visivo reference, see the weld symbol chart.
G
What does G mean on a Saldatura 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: Dimensione 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 Codice, WPS number, or spec reference. Omit if unused — A2.4 §6.12
CJP
What does an undimensioned Saldatura a Scanalatura 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
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