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Chapter 4

Chapter 4. Welding Symbols. Weld Specification on Prints • Weld Joints • Weld Types • Welding Symbols • Edge Preparation • Brazing Symbols • Nondestructive Examination (NDE) Symbols. Object dimensions and welding symbols on a print convey fabrication information to the welder.

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Chapter 4

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  1. Chapter 4 Welding Symbols Weld Specification on Prints • Weld Joints • Weld Types • Welding Symbols • Edge Preparation • Brazing Symbols • Nondestructive Examination (NDE) Symbols

  2. Object dimensions and welding symbols on a print convey fabrication information to the welder.

  3. A weld is specified with a welding symbol and is completed by the welder using the specified process.

  4. The five basic weld joints are the butt, lap, T, edge, and corner weld joints.

  5. Weld types are classified by the cross-sectional shape of the weld.

  6. Groove welds are classified by the edge shape of thejoint members.

  7. Fillet welds are triangular in cross-sectional shape. They transfer loads to joint members positioned at 90° to one another.

  8. Plug and slot welds provide strength without affecting the edges of the joint members.

  9. Stud welds permanently join threaded fasteners to parts using heat and pressure.

  10. 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.

  11. 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.

  12. Surfacing welds are commonly used to build up worn parts.

  13. Edge welds are commonly used on thin materials where filler metal isnot required.

  14. Welding symbols provide standardized information regarding welding and examination requirements.

  15. The arrow of the welding symbol points to the location of the weld specified.

  16. The reference line divides the welding symbol into the arrow side and the other side.

  17. Weld symbols on the welding symbol indicate the type of weld required.

  18. Dimensions included in the welding symbol specify weldsize and location requirements.

  19. Information in the tail of the welding symbol pertains to weld specification, weld process, or other reference.

  20. Supplementary symbols provide additional information regarding the weld required.

  21. 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.

  22. Brazing symbols show the brazing process designation in the tail.

  23. Nondestructive examination (NDE) symbols can be part of a welding symbol or a separate NDE symbol.

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