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Slide 2 PowerPoint Presentation Chapter 4 Welding Symbols Weld Specification on Prints Weld Joints Weld Types Welding Symbols Edge Preparation Brazing Symbols Nondestructive Examination (NDE) Symbols Slide 3 Chapter 4 Welding Symbols Object dimensions and welding symbols on a print convey fabrication information to the welder. Slide 4 Chapter 4 Welding Symbols A weld is specified with a welding symbol and is completed by the welder using the specified process. Slide 5 Chapter 4 Welding Symbols The five basic weld joints are the butt, lap, T, edge, and corner weld joints. Slide 6 Chapter 4 Welding Symbols Weld types are classified by the cross-sectional shape of the weld. Slide 7 Chapter 4 Welding Symbols Groove welds are classified by the edge shape of the joint members. Slide 8 Chapter 4 Welding Symbols Fillet welds are triangular in cross-sectional shape. They transfer loads to joint members positioned at 90 to one another. Slide 9 Chapter 4 Welding Symbols Plug and slot welds provide strength without affecting the edges of the joint members. Slide 10 Chapter 4 Welding Symbols Stud welds permanently join threaded fasteners to parts using heat and pressure. Slide 11 Chapter 4 Welding Symbols The size of spot and projection welds is the diameter of the weld nugget. The size of seam welds is the diameter of the weld nugget and length of the weld. Slide 12 Chapter 4 Welding Symbols Back welds are deposited on the opposite side of the part after the groove weld is made. Backing welds are deposited on the opposite side of the part before the groove weld is made. Slide 13 Chapter 4 Welding Symbols Surfacing welds are commonly used to build up worn parts. Slide 14 Chapter 4 Welding Symbols Edge welds are commonly used on thin materials where filler metal is not required. Slide 15 Chapter 4 Welding Symbols Welding symbols provide standardized information regarding welding and examination requirements. Slide 16 Chapter 4 Welding Symbols The arrow of the welding symbol points to the location of the weld specified. Slide 17 Chapter 4 Welding Symbols The reference line divides the welding symbol into the arrow side and the other side. Slide 18 Chapter 4 Welding Symbols Weld symbols on the welding symbol indicate the type of weld required. Slide 19 Chapter 4 Welding Symbols Dimensions included in the welding symbol specify weld size and location requirements. Slide 20 Chapter 4 Welding Symbols Information in the tail of the welding symbol pertains to weld specification, weld process, or other reference. Slide 21 Chapter 4 Welding Symbols Supplementary symbols provide additional information regarding the weld required. Slide 22 Chapter 4 Welding Symbols The arrow of the welding symbol is broken if a specific joint member requires edge preparation. If either joint member can be prepared, the arrow is not broken. Slide 23 Chapter 4 Welding Symbols Brazing symbols show the brazing process designation in the tail. Slide 24 Chapter 4 Welding Symbols Nondestructive examination (NDE) symbols can be part of a welding symbol or a separate NDE symbol.