Weld Symbol Questions
Common questions about 溶接記号 per AWS A2.4. What the letters, numbers, and markings mean on engineering drawings.
AWS A2.4 governs how 溶接 symbols are drawn and read on engineering drawings. Every element of the symbol — the 基線, arrow, 溶接記号, dimensions, tail, and supplementary symbols — has a defined meaning. The questions below cover the most commonly misread parts of a 溶接記号表示, with answers sourced directly from A2.4. For a full 目視 reference, see the weld symbol chart.
G
What does G mean on a 溶接 symbol?Grinding and finishing designators per AWS A2.4
↓
Arrow side vs. 反対側 — what is the difference?Below the reference line = 矢の側. Above = other side.
⌐
What is the broken arrow on a weld symbol?On bevel, J形開先, 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: サイズ 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 基準, WPS number, or spec reference. Omit if unused — A2.4 §6.12
CJP
What does an undimensioned 開先溶接 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