So I’ve been trying to follow along with the laser hardening project by ahmedhussain18 and I guess I don’t quite fully understand the heat flux equation he uses. The problem I run into is that I want to do a simulation using a small 56um diameter laser spot size (typical for fiber lasers used in cutting and welding) but it seams that when I get to that scale, the equation tends to 0 for some reason. This could be an issue with how I input the equation.:

((2*140)/(pi*(0.000025^2)))*EXP((-2*(((x-0.00277)^2)+((y-0.0021)^2)+(-z+(0.0381*t))^2))/(0.000025^2))

Should I be using the measured spot size as opposed to the theoretical spot size of the laser?

Thanks for any help!