The final inspection consists of two major Non Destructive Testing (NDT) methods, namely Magnetic Particle Inspection (MPI) and Ultrasonic inspection (UT).

Magnetic particle inspection
The purpose of the final magnetic particle inspection is to safeguard that no surface defects remains on the finished chain. The wet method is used in combination with fluorescent light. We have installed an Automatic Magnetizer to make the inspection more thorough, easier and of course quicker to perform.

All links are checked in the most sensitive areas, the link-surfaces which have been in contact with the electrode clamps of the welding machine, the weld itself and its vicinity. For chain diameters of 132 mm and above 10% of the links are subject to surface control of all accessible surfaces. The link identification established at the pre heat-treatment control is utilized at reporting of the MPI-results in RChain. The inspection is performed by qualified and certified personnel.

Ultrasonic inspection
The purpose of the ultrasonic inspection is to check the interior of the welded area on the link. This is obtained by the use of angular probes for testing every link in the longitudinal direction through the weld. UT results are reported in RChain. The inspection is performed by qualified and certified personnel.

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