Free AutoCAD welding symbols (DWG), ISO 2553 style: weld symbols and welding symbol blocks

About ISO 2553

ISO 2553:2019 sets the rules for showing welded joints on technical drawings: elementary, combined and supplementary symbols, the arrow, the reference line, the tail and the dimensions. It knows two systems, A and B, that differ in how the arrow side and the other side are shown. The proportions of the symbols in this library are taken from the tables of the standard; the joint preparation dimensions of tables 8 and 9 and the drawn examples of the annexes are not included.

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

What is the difference between system A and system B?

System A uses a continuous and a dashed reference line: a symbol on the continuous line is on the arrow side, a symbol on the dashed line is on the other side. System B uses one reference line: a symbol below it is on the arrow side, a symbol above it on the other side. Do not mix the two systems on one drawing; the library has both.

How do I set the weld size and length?

Double-click the welding symbol (or run EATTEDIT) and fill in SIZE and LENGTH. Write a for the throat thickness, z for the leg length and s for the penetration depth, for example a5. Write intermittent welds as n x l (e), for example 3x50(100). The blocks for both sides have a second pair of attributes for the other side.

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.

Where are the American welding symbols?

In the AWS A2.4 library, a separate download. American practice puts the arrow side below the reference line, uses one reference line and gives the size and the length and pitch in other positions, so the two libraries are kept apart.

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.