Home » Boiler Tube Failure Handbook » Cracking » In or near weld or attachment

Observation: Cracking » In or near weld or attachment

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Mechanism

	Appearance	Observation	Locations	Mechanism
	Catastrophic failure associated with weld overlay	Cracking » In or near weld or attachment » Transverse	Waterwall	Hydrogen Damage
	Complete failure at weld	In or near weld or attachment » Transverse » Cracking	Superheater	Thermal FatigueDissimilar Metal Weld Creep
	Transverse crack near support	Cracking » In or near weld or attachment » Transverse	Evaporator	Thermal Fatigue
	Brittle fracture in heat affected zone of a weld	Transverse or Random » Cracking » In or near weld or attachment	ReheaterSuperheater	Graphitization
	Multiple cracks associated with attachment on outside of tube	Longitudinal or Random » Cracking » In or near weld or attachment	WaterwallEconomizer	Corrosion Fatigue
	Longitudinal ID corrosion-fatigue cracks	Cracking » In or near weld or attachment » Longitudinal	Waterwall	Corrosion Fatigue
	Longitudinal cracks adjacent to weld	Longitudinal or Random » Cracking » In or near weld or attachment	Superheater	Wrong material/Creep
	Complete weld separation	Cracking » In or near weld or attachment » Transverse	Superheater	Dissimilar Metal Weld Failure (DMW)
	Cracks close to attachments	Cracking » In or near weld or attachment » Longitudinal	Waterwall	Corrosion Fatigue
	Appearance	Observation	Location	Mechanism