In electric arc welding process
It is crucial to know electrical arc optical emission properties to accurately measure the temperature, because when we measure hot metal emissions, its continuous IR-emission nature is described by plank low and measured by the pyrometer, subsequently affecting the measurements. In this case, it is essential that the own line-emission of arc plasma will not disturb the process and will not make superposition with sensor spectral sensitivity range.
From many literature sources, the maximum plasma emission comes to 1150nm. At the same time, our pyrometer A5-EX works in spectrum 2.1-2.5mkm and has good blocking for shorter wavelengths.
For small targets (like carbide inserts welded to the saw disk – 3-6mm), I would propose two options: a pyrometer with fiber optics and a pyrometer without. A faraway pyrometer will be better because welding may be hazardous for optical devices.