Welding Fundamentals Summary

Introduction to Welding Drawings and Symbols

  • Focus on welding drawings, symbols, and types of welds.

Purpose of Welding

  • Unite metal pieces to support loads.

  • Welding symbols on drawings specify type and size of weld.

Basic Welding Terms

  • Key terms: Throat, Weld size (leg), Face, Thickness, Groove angle, Bevel angle, Root face, Root opening.

Basic Welding Joints

  • Types include Butt, Lap, Corner, Tee, and Edge joints.

Welding Symbols

  • Shortened language for accuracy in drawings.

  • Based on American Welding Society symbols to convey type and specifications of weld.

Elements of Welding Symbols

  1. Reference line

  2. Arrow

  3. Basic weld symbol

  4. Dimensions (inches or millimeters)

  5. Supplementary symbols

  6. Finish symbols

  7. Tail

  8. Specification or other reference

Weld Locations

  • Welds on the arrow side: symbol on bottom of reference line.

  • Welds on other side: symbol on top.

  • Weld-all-around symbol at intersection of reference line and arrow.

Types of Basic Weld Symbols

  • Fillet, Plug or Slot, Spot or Projection, Stud, Back or Backing, Edge, Corner, Groove types (V, U, J, Flare-Square, etc.).

Supplementary Weld Symbols

  • Include Field weld, All-around, Melt-thru, Contour indicators (Flush, Convex, Concave).

Tail of Welding Symbol

  • Indicates process/formulation specific by letters, reference codes can be placed here.

Multiple Reference Lines

  • For sequences of operations, nearest reference line specifies primary operation.