Welding symbols are graphical representations used to communicate information about the welding process on engineering drawings. These symbols provide important details about the type of weld, its dimensions, and other specifications.

Some common welding symbols include:

1. Fillet Weld Symbol: This symbol represents a fillet weld, which is a triangular weld that joins two surfaces at a right angle.

2. Groove Weld Symbol: This symbol represents a groove weld, which is a weld made in a groove between two surfaces.

3. Plug Weld Symbol: This symbol represents a plug weld, which is a circular weld made through a hole in one surface to join it to another surface.

4. Spot Weld Symbol: This symbol represents a spot weld, which is a weld made by applying pressure and heat to two or more overlapping metal sheets.

5. Seam Weld Symbol: This symbol represents a seam weld, which is a continuous weld made along the length of two or more overlapping metal sheets.

6. Surfacing Weld Symbol: This symbol represents a surfacing weld, which is a weld made to build up or reinforce a surface.

These symbols are typically placed on the welding joint or near the area to be welded on the engineering drawing. They provide information about the weld size, type, and other specifications such as the welding process, electrode type, and weld length.