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Welding Defect.ppt
The document discusses various welding defects including cracks, surface defects, contour defects, root defects, and miscellaneous defects. It provides details on specific types of each defect such as undercut, overlap, incomplete root fusion, gas porosity, slag inclusions, and their potential causes like incorrect welding technique, contamination, or material defects. Various repair methods are also mentioned such as grinding, chipping, and arc air gouging.
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Welding Defect.ppt
- 1.
- 2. Weld Defects Cracks Surface Contour defects Rootdefects Miscellaneous Defects
- 3. Weld Defects Other associateddefects Cavities (rongga) Solid inclusions Set up irregularities Material defects
- 4. CRAKS Hydrogen (HICC) Solidification (Hottears) Reheat cracks Lamellar tearing
- 5. Cracks Longitudinal parent metalcrack Transverse weld metal crack Longitudinal weld metal crack Lamellar tearing
- 6. Transverse crack Centerline crack
- 7.
- 8. Undercut/Potong bawah Excessive amps/volts Excessivespeed Incorrect electrode angle Excessive weaving Incorrect welding technique Electrode too large
- 9.
- 10.
- 11. Overlap Contamination (pencemaran) Slow travelspeed Incorrect welding technique Current too low
- 12.
- 13. Crater Pipe Too fasta cooling rate Deoxidization reactions and liquid to solid volume change Crater crack
- 14.
- 15.
- 16. Contour Defects Incomplete filledgroove Poor cap profile Excessive cap height Incomplete filled groove + Lack of sidewall fusion
- 17. Incomplete filled groove Excesscap reinforcement
- 18.
- 19. Root Defects Incomplete rootfusion Incomplete root penetration Low Amps/volts Large Root face Small Root Gap Fast Travel Speed Incorrect Electrode Angle Contamination
- 20. Root Defects Lack ofroot fusion Lack of root Penetration
- 21. Lack of rootfusion Lack of root penetration
- 22. Concave root Root Defects Rootfaces too large Root gap too large Excessive back purge pressure during TIG welding Excessive root bead grinding before the application of the second pass
- 23.
- 24. Excessive root penetration RootDefects Root faces too small Root gap too large Excessive amps/volts Slow travel speed
- 25.
- 26. Concave root Excessiveroot penetration
- 27. Shrinkage groove Root Defects Insufficientweld metal deposited in the root pass Too fast a cooling rate during the application of the root bead pass Poor welding technique
- 28. Root Defects Burn through HighAmps/volts Small Root face Large Root Gap Slow Travel Speed
- 29.
- 30.
- 31. Miscellaneous Defects Arc strike Accidentalstriking of the arc onto the parent material Faulty electrode holder Poor cable insulation Poor return lead clamping
- 32. Spatter Excessive current Damp electrodes Contamination Incorrectwire feed speed when welding with the MAG welding process Miscellaneous Defects
- 33.
- 34. Gas Cavities Cluster porosity Gaspore Blow hole Herringbone porosity Root piping Loss of gas shield Damp electrodes Contamination Arc length too large Damaged electrode flux Moisture on parent material Welding current to low
- 35.
- 36. Single gas pore Clusterporosity
- 37. Solid Inclusions Slag originatesfrom welding flux MAG and TIG welding process produce silica inclusions Slag is caused by inadequate cleaning Other inclusions include tungsten and copper inclusions from the TIG and MAG welding process Lack of sidewall fusion with associated slag Slag inclusions Parallel slag lines
- 38. Elongated slag lines Interpassslag inclusions
- 39. Set-up Irregularities Plate/pipe LinearMisalignment (Hi-Lo) Poor fit-up Angular Misalignment
- 40.
- 41. Material Defects Lamination Mechanical damageLap Segregation line
- 42.
- 43.
- 44.