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Wire Breaks And Failure Analysis
PagePreface 1
Types of Wire Breaks 2
Causes of Breaks 3
Prevention of Breaks 4
Wire Break Classification 5
Possible Source of Inclusions 6
I Process Related Problems 7
Annealing Problems: Arcing• Molten Ends 8
Cut Ends 9
Mechanical Damage 10-11
Scriber Marks 12
Welding Related Wire Breaks
• Hot Welds 13
• Cold Welds 14
Wire Drawing Problems
• Bulging 15
• Chatter 16
• Crowsfeet 17
• Cups, Cones, and Cuppy Wire 18
• Drawing Slivers 19
• Misalignment 20
• Packed or Plugged Die (compacted fines) 21
• Shaving 22
• Surface Tearing and Galling 23
• Tensiles 24
• Torsion Breaks 25
II Rod Related Problems 26
Casting Problems• High Oxygen 27
• Icicles / Slag 28
• Macroporosity 29-30
• Off Center Macroporosity 31
Hot Rolling Problems
• Slivers / Seams 32-33
• Roll Protrusions and Overfills 34
• Oxides and Hot Cracks 35
III Inclusions 36
Inclusion Absent 37
Inclusion Present
• Magnetic Inclusions 38-39
• Non-Magnetic Inclusions 40IV Look-Alikes 41-43V Field Service Related Defects 44
Corrosion 45
Fatigue 46
Hydrogen Embrittlement 47
Over Heating 48
Oxidation 49