Chapter 3 Welding Joints, Positions, and Symbols 49 3.1.5 Edge Joint An edge joint is formed when the surfaces of two pieces are in contact and their edges are fl ush (even). The pieces are joined by welding along at least one of the fl ush edges. Figure 3-6 shows the edge prepara- tion for various edge joints. 3.1.6 Flange Joint A fl ange joint is formed when the edge of one or more pieces of the joint is bent to form a fl ange. The edges are aligned and a weld is placed along the speci- fi ed edges. Figures 3-2, 3-4, and 3-6 show examples of fl ange joints. 3.1.7 Flare-Groove Joint Flare-groove joints are formed when the fl anged edges of one or both pieces are placed together to form a single-fl are-bevel or double-fl are-V-groove. The weld is placed in the bevel or V-groove, as shown in Figures 3-2, 3-4, and 3-5. 3.2 Types of Welds A weld is a fused joint between two or more pieces of metal or nonmetal. Welds are created by applying heat until the materials melt, fl ow together, and are cooled to form a single piece. This can be done with or without Square-groove Bevel-groove Double-bevel-groove Flare-bevel-groove J-groove Figure 3-5. Various methods of T-joint edge preparation. Square-groove Bevel-groove V-groove J-groove U-groove Edge-flange weld Figure 3-6. Various edge preparations for edge-type joints.