Arrows & Reference Lines
Reading and properly interpreting welding blueprints requires a general understanding of welding symbols.
Basic welding symbols include an arrow and a reference line. If the diagram shows a joint with reference line extending to the right (reference lines always extend to the right), and an arrow on top, the weld is made on the opposite (left) side. If the diagram shows a reference line with the arrow below, the weld is made on the same (right) side. If the diagram shows a reference line with the arrow above and below, the weld is made on both sides. If the diagram shows a circle around the arrows on the reference line, the weld is made all the way around the joint.
Fillet Welds & Groove Welds
Two of the most common types of welds used in basic welding are Fillet Welds and Groove Welds
- Fillet Weld - Roughly triangular in shape, a Fillet Weld is made when welding most 90° angle joints.
- Groove Weld - Made in the groove between two pieces of metal, a Groove Weld can be square grooved with straight sides, beveled with flat angled sides, or U-shapes. Groove Welds are commonly used for butt, edge and corner joints.