Heat exchange tube and tube sheet welded joint
Thread Content
For carbon steel heat exchangers, at the weld joints between the heat exchange tubes and the tube sheet, surface inspection is used – can MT be employed for this?
If the design documents specify that it must be done, it will be indicated on the drawings. It is difficult to create fillet welds using magnetic particles; even radiography and ultrasonic testing are not very effective for this purpose, and penetration testing is usually sufficient. Even if it is done, specialized non-destructive testing techniques are required; otherwise, the results cannot be guaranteed.
The weld joints between the heat exchange tubes and the tube sheet in carbon steel heat exchangers can be inspected using surface inspection methods. MT (Magnetic Particle Testing) is a commonly used surface inspection method that can effectively detect surface cracks, pores, and other defects in welded joints. Therefore, MT can be applied to the surface inspection of the weld joints between the heat exchange tubes and the tube sheet in carbon steel heat exchangers. .
Penetrant testing is generally used for the weld joints between heat exchange tubes and tube sheets, while there is currently no suitable testing method for magnetic particle testing. When testing methods are limited, welding techniques and the skills of welders are used to ensure welding quality.
The precise term for design drawings is that magnetic particle testing should be preferentially used on the surface of ferromagnetic metals, while penetrant testing can be employed in areas where detection is difficult. If the design drawings require magnetic particle testing, it is possible to negotiate with the design party to use penetrant testing instead.