Element killing during laser melting

Dear friends

I am working on laser cutting with moving heat source with subsequent stress analysis. I have successfully simulated the thermal analysis . However, I dont know how to delete/kill those elements whose temperature goes beyond the melting temperature during laser heating. for example, Assume that the melting temperature is 1273 K, thus any element with a temperature of 1273 or greater must be killed to simulate melting.
comsol can do this element kill process?
Can anybody guide me in this issue?

Thanks in advance