WELDING TERMS AND DEFINATIONS

WELDING TERMS AND DEFINATIONS

• 1. A union between materials caused by heat and (or) Pressure is called a weld.
  2. A configuration of member is called a JOINT.
  3. Combination of two types of weld is called a Compound Weld.
  4. Actual Thickness = Design Throat Thickness + Excess Weld Metal.
  5. The relation between Design Throat Thickness and Leg Length isa = 0.707×Z,

     Z = 1.41× a,

     Where,

     a = Design Throat Thickness,

     Z = Leg length.

  6. For deep penetration, Design Throat Thickness is denoted by “S” instead of “a”.
  7. Concave Fillet is preferred for joints subjected to Fatigue Loading.
  8. If angel between plates is,                                                                                                                                                                30°    Edge joint                                                                                                                                                                                          30-135     Corner joint                                                                                                                                                                                 135-180   Butt joint
  9. If a weld is formed without using a filler material then that weld is called Autogenous Weld.
  10. Weld Joint between same parent material and Weld Material is called Homogenous Weld Joint
  11. Weld Joint between same parent material and different Weld Material is called Heterogeneous Weld Joint.
  12. Weld Joint between different parent material and different Weld Material is called Transition or Dissimilar Weld Joint.
  13. The boundary between Weld Metal and H.A.Z is called Fusion Boundary.
  14. Included Angel of Single V- Preparation is 70 degree.
  15. Vertical -Up (PF) position is Highest Heat Input Position.
  16. Vertical -Down (PG) position is Lowest Heat Input Position.