ZM150 Degauss controller for Zeromag
Zeromag measures and neutralizes magnetic fields that may be present in the weld preparation area of mating steel components. When welding pipes, several approaches can be used. Under normal operation, Zeromag dynamically reduces magnetism during welding. This method is effective, but having demagnetizing components in place while welding can hinder throughput.
ZM150
The ideal approach would be to fully degauss all components, but the process is often too lengthy and complex. Additionally, there are challenges with AC degauss fields penetrating deeply into the bulk of the material, which can leave the core still magnetized.
The Zeromag degauss option effectively degausses the entire fitted-up butt joint. In this mode, a cable is wound around the pipe butt joint, typically using clam coils, and a quick downcycle is initiated. Once the joint is degaussed, the coils are removed, and welding can proceed. Magnetism may return over time or as the magnetic geometry changes during welding. If this occurs, the demagnetization procedure can be quickly repeated.
This joint degaussing process can also be applied to pipe end degaussing. In this mode, the Zeromag degauss option focuses on the pipe end before fit-up. This downcycling process is relatively quick—typically less than 3 minutes. The hysteresis loop time is about 10 seconds, allowing deep penetration of the degaussing field into the steel of the pipe end. However, the magnetism in the rest of the pipe remains unchanged, so over time, magnetism from the rest of the pipe may ‘leak’ back into the pipe end. This process is material-dependent but typically takes about 1 hour.
The dual degausser controller ZM150x2 is available for controlling two Zeromag units, which is used for degaussing larger and thicker-walled pipes.
ZM150