WELDING IMPERFECTIONS

WELDING IMPERFECTIONS

• 1. Deviation from Ideal Weld is called Imperfection
  2. Unacceptable imperfection is called Defect.
  3. Crater Cracks are found only on Weld Metal.
  4. Solidification Cracks are formed due to impurities like Sulphur and Copper.
  5. Pre-heating is applied to avoid Hydrogen Cracking.
  6. Lamellar tearing is caused only in Rolled Plates.
  7. Porosity is caused due to Damped Electrode.
  8. Crater Pipe can be avoided using Slope-Out Device.
  9. Tungsten Inclusion can be avoided using Slope-in Device.
  10. Lack of Root Fusion is caused due to Low Current, Excessive Root Face, Incorrect Tilt Angle and Linear Mis-alignment.
  11. Lack of Penetration is caused due to Excessive Root Face, Insufficient Root Gap and Low Current.
  12. Excess Penetration is caused due to High Current & Large Root Gap.
  13. Under-Cut is caused due to High Welding Current, High Travel Speed & Incorrect Electrode Angel.
  14. Under-Cut is mainly caused due to High Welding Current.
  15. Deflection of Arc with magnetic force is called Arc Blow.
  16. If Arc Blow is occurring then switch the power Supply from D.C to A.C.
  17. Root Concavity is caused due to excessive Back Purging.
  18. Burn Through is caused due to Excessive welding Current, Insufficient Travel Speed & excessive Rot Gap.
  19. Causes of Arc Strike are Hard Spots, reduction in Thickness & Cracking.
  20. Spatters are caused due to High Current