Welding Process
The arc welding process produces small metal fragments. These fragments, located inside a hot plasma cloud, are heated up and reflect energy to the pyrometers; consequently, the temperature reading is no longer accurate.
there is no problem measuring the hot metal layer temperature with a pyrometer. It should be considered that during arc welding, the pyrometer looks at the hot metal through the arc plasma cloud. The plasma cloud itself will not interfere with the pyrometer because the plasma’s linear spectrum is quite far away from the pyrometer’s sensitivity spectral range.
The arc welding process produces small metal fragments. These fragments, located inside a hot plasma cloud, are heated up and reflect energy to the pyrometers; consequently, the temperature reading is no longer accurate.
These small hot metal fragments emit a continuous hot spectrum, which is impossible to filter.
This additional emission will affect the amount of energy the pyrometer detects and result in measurement error.
For this reason, we can’t predict the accuracy in advance; it all depends on how clean the plasma cloud is during the process.
The pyrometer
Technical solution Video
