Each day, thousands of places experience electric storms that produce a much higher quantity of rays, from to 40 to 100 per second as average. They are electricity, and for that reason the temperature is related to the total voltage and current of the ray.
The soldering equipment also uses an electric arc to achieve high temperatures, more or less 3500ºC. However the difference is that the ray carry much more current and the potential difference is measured in millions of volts.
Enough reasons to affirm that the temperature of a common ray could vaporize several materials. An estimation of temperature would seem rather accurate surpassing 20.000 or 30.000 degrees Celsius. It was measured in fact using a technique based in spectrum analysis providing these numbers.