Free AutoCAD welding symbols (DWG), AWS A2.4 style: weld, brazing and NDE symbol blocks

About AWS A2.4

AWS A2.4:2007 is the American standard for symbols for welding, brazing and nondestructive examination. It defines the reference line, arrow and tail, the weld symbols with their dimensions and the supplementary symbols, and the examination methods with their letter designations. The shapes in this library follow its figures and its SI dimension annex; the three-dimensional pictures of the joint types (B, C, T, L, E) are not drawn.

These symbols are our own drawings after the figures of the standard. They are not copied from it, and the library is not certified against it. Check them against the standard, your company standard or your customer’s legend before you rely on a shape.

Frequently asked questions

Which side is the arrow side?

The arrow side is the side of the joint the arrow points to. In AWS A2.4 a weld on the arrow side has its symbol below the reference line; a weld on the other side has it above the line; a weld on both sides has a symbol on each side. The ISO 2553 library works differently and has its own download.

How do I specify a groove weld?

Double-click the welding symbol (or run EATTEDIT). Put the depth of preparation or the effective throat in SIZE, the root opening in ROOT_OPENING and the groove angle in GROOVE_ANGLE; the blocks place them where the standard puts them. Use the groove types with a second symbol for welds made from both sides.

Can I use the symbols in commercial projects?

Yes. They are free to use and modify in your own projects, including commercial ones. They are provided as is, without warranty.

How do I show brazing and examination?

Brazing uses the weld symbols, and you name the process in the tail, for example TB or FB. For examination use the NDE blocks: choose the one for the arrow side, the other side or both sides and fill in METHOD (for example RT, UT, MP, PT or VT), the NUMBER of examinations and the LENGTH.

Can I change a symbol or add attributes?

Yes. Open the DWG, edit a block with BEDIT to change it or add attributes, and save. To update drawings that already contain the block, run ATTSYNC or replace the block. Make a backup first: attribute values can be lost if ATTSYNC is used carelessly.

Where do I find a ready-made set of these symbols for AutoCAD?

AutoCAD itself ships only a small set of sample blocks, so a full symbol set has to come from a library. Download the ZIP on this page and open the DWG: every symbol is a block. Insert one with INSERT (Blocks palette, Libraries tab, then pick the DWG) or drag it from DesignCenter (ADCENTER). You can also download a single symbol on its own.