10.5 PREHEATING

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The primary reason for post-weld heat treatment is to relieve the residual stresses in a welded fabrication. Stresses occur during welding due to the localized heating and severe temperature changes that occur. PWHT releases these stresses by allowing the metal to creep slightly at the elevated temperature. However there may also be in-service conditions that require particular PWHT conditions. These may not be so closely detailed in construction specifications and inspectors should therefore be particularly aware of these potential requirements when allowing, authorizing or inspecting in-service repairs.
Discussion: However there may also be in-service conditions that require particular PWHT conditions. These may not be so closely detailed in construction specifications and inspectors should therefore be particularly aware of these potential requirements when allowing, authorizing or inspecting in-service repairs.
Page 1 and 2: 10.5 PREHEATING
Page 3 and 4: Preheating
Page 5 and 6: Preheating
Page 7 and 8: • Bring temperature up to preheat
Page 9 and 10: Preheat can be applied using severa
Page 11: The temperature of PWHT is selected
Page 15 and 16: Typical PWHT Chart Insertion temper
Page 17 and 18: PWHT Chart
Page 19 and 20: PWHT
Page 31 and 32: PWHT- Local
Page 39 and 40: PWHT- Equipments
Page 47 and 48: Fun-Photo: Induction Bending Pipe b
Page 49 and 50: Fun-Photo: Induction Bending Pipe b
Page 51 and 52: Other factors can also affect harde
Page 53 and 54: http://www.azom.com/article.aspx?Ar
Page 56 and 57: Welding variables, such as heat inp
Page 58 and 59: Welding- Plate thickness & Weld Geo
Page 60 and 61: Weld Macro- Geometry
Page 62 and 63:
Weld Macro- Geometry
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Weld Macro- Geometry
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The simplest means to determine har
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Jominy Bar
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Jominy Bar
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It may be important for the welding
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Typical Hardness Values Table 11—
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HIC
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HIC- Hydrogen Induced Cracking
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TTT Curve
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Martensite
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10.8 MATERIAL TEST REPORTS Material
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Billets/Ingots
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Billets/Ingots
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Billets/Ingots
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Billets/Ingots
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Billets/Ingots
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Billets/Ingots
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Product analysis- Pipe
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For the purposes of this publicatio
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Ductile to brittle transition tempe
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Fracture toughness
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Charpy impact testing
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Elevated mechanical property testin
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Further Reading
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Quiz 1) See the figure below for po
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c) 50% coarse pearlite + 25% bainit
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10.5 PREHEATING

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