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Saw defects
The document discusses the effects of various welding parameters and techniques on weld quality. It identifies issues such as porosity, undercutting, improper reinforcement, burn-through, and cracking that can occur when parameters like current, voltage, speed, beveling, fit-up, wire position, and granular material depth are not properly set or techniques not properly followed. Maintaining correct welding parameters and techniques is important to produce welds without defects.
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Saw defects
- 1. Effect of Varyingthe Welding Current • Arc Blow Porosity or Ropey Bead • Burn-Through • Metal Spillage On Rounds Fusion Zone • Pear Shaped • Penetration too deep or too shallow • Reinforcement Overlapped • Reinforcement too high or too low LOW CORRECT HIGH
- 2. Effect of HighWelding Voltage • Arc Blow Porosity or Ropey Bead • Undercutting • Penetration too deep or too shallow • Reinforcement too high or too low • Slag Sticking in Deep Groove LOW CORRECT
- 3. Effect of LowWelding Voltage • Pear Shaped • Reinforcement Narrow & Steep-Sided • Reinforcement Overlapped • Reinforcement Ropey CORRECT HIGH
- 4. Effect of Varyingthe Welding Speed • Low Speed • Arc Blow Porosity or Ropey Bead • Reinforcement Overlapped • High Speed • Reinforcement too high or too low • Transverse Cracking in Multi-pass Weld • Undercutting • Voids and Cracks LOW CORRECT HIGH
- 5. Effect of Beveling •Burn-Through • Reinforcement Narrow & Steep-Sided • Reinforcement too high or too low
- 6. Effect of RootFace Dimension • Burn-Through
- 7. Effect of PlateCleanliness on Finished Welds • Porosity and Gas Pockets • Rust Porosity • Transverse Cracking in Multi-pass Weld CROSS SECTION TOP CLEANED CONTAMINATED
- 8. Effect of ImproperFit-up in Welds Having Manual Weld Backing • Porosity and Gas Pockets • Undercutting CORRECT INSUFFICIENT SPACING
- 9. Effect of WirePosition and Reinforcement Shape in Fillet Welds • Porosity and Gas Pockets • Transverse Cracking in Multi-pass Weld • Undercutting • Voids and Cracks CORRECT CONCAVE REINFORCEMENT IMPROPER WELD POSITION
- 10. Effect of ImproperFit-up in Double Welds • Burn-Through • Porosity and Gas Pockets • Undercutting • Voids and Cracks SQUARE GROOVE BUTT JOINT 3/8-in. Plate 900 DOUBLE- VEE GROOVE BUTT JOINT 5/8-in. Plate CORRECT SPACING EXCESSIVE SPACING
- 11. Effect of ImproperFit-up in Square Butt Weld • Reinforcement too high or too low
- 12. Effect of ImproperFit-Up in Steel-Backed Welds • Penetration too deep or too shallow • Reinforcement too high or too low • Undercutting CORRECT SPACING INSUFFICIENT SPACING EXCESSIVE SPACING GAP BETWEEN PLATES AND BACKING
- 13. Effect of Properand Improper Depth of Granular Material • Porosity and Gas Pockets • Reinforcement Narrow & Steep-Sided • Reinforcement Ropey CORRECT SHALLOW
- 14. Effect of WeldingWire Offset in Circumferential Seam Welding • Metal Spillage On Rounds Fusion Zone SMALL OFFSET MEDIUM OFFSET LARGE OFFSET