Bs 499 Part 2 May 2026

| Weld Type | BS 499 Symbol | Description | | :--- | :--- | :--- | | | A right triangle | The most common weld in structural steel. | | Butt (Square) | Two vertical lines | Edges are square and brought together. | | Single V Butt | A "V" shape | Used for thicker plates; requires beveling. | | Plug / Slot | A rectangle or circle | Used for overlapping sheets. | | Seam Weld | A row of small circles | For resistance seam welding. |

Do you have a welding symbol from a legacy drawing that you cannot decipher? Drop a description in the comments below, and let’s decode it together using BS 499 Part 2. Disclaimer: This post is for educational purposes. Always refer to the latest official BSI standard (BS 499-2:1994) or superseding ISO standards for contractual or safety-critical work. bs 499 part 2

Decoding the Dots & Dashes: Why BS 499 Part 2 is the Blueprint of Welding Communication | Weld Type | BS 499 Symbol |

Whether you are maintaining legacy infrastructure or working on a new British-built pressure vessel, understanding BS 499 Part 2 is non-negotiable. | | Plug / Slot | A rectangle

For the young apprentice: Memorize the arrow-side rule. For the senior inspector: Use the standard to hold drawings accountable. For the designer: Never assume "everyone knows what I mean."

BS 499 Part 2 is not just a dusty old standard—it is the grammar of fabrication. It removes guesswork, reduces rework, and prevents catastrophic joint failure caused by a misplaced weld.