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Corrosion
Small plate heat exchanger .
materials should align with the corrosion resistance of the base materials , preventing galvanic corrosion and ensuring the overall corrosion resistance of the welded joints .
• Post-weld treatment : Employing appropriate postweld treatments , such as passivation or pickling , helps remove oxides and scale formed during welding . This enhances the corrosion resistance of the weld and the surrounding areas , reducing the vulnerability to localized corrosion .
Quality control :
• In-process inspections : Rigorous quality control measures during the fabrication process involve continuous in-process inspections . Regular checks for weld quality , material integrity , and adherence to design specifications are essential . Non-destructive testing ( NDT ) techniques , such as radiography or ultrasonic testing , can be employed to identify hidden defects that could compromise the corrosion resistance of the heat exchanger .
• Material verification : Ensuring the correct selection and verification of materials is a critical aspect of quality control . Material inconsistencies or deviations from specifications can lead to corrosion vulnerabilities . Proper documentation and traceability of materials throughout the fabrication process are essential .
• Compliance with standards : Adherence to industry standards and codes is crucial for maintaining the quality and corrosion resistance of heat exchangers . Quality control processes should align with relevant standards to ensure that the fabricated components meet or exceed the specified requirements .
• Documentation and traceability : Comprehensive documentation and traceability of fabrication processes , materials , and inspections are vital for quality control . This documentation aids in identifying any issues that may arise during subsequent inspections , repairs , or maintenance , contributing to the long-term reliability of the heat exchanger .
48 Heat Exchanger World September 2024 www . heat-exchanger-world . com