Hello everyone,
There is a porosity formation at the end of the process right in the middle of the workpiece. I know porosities formation depends on several factors such as laser power, solidification rate, welding speed, backfilling speed, etc. So, my question is:
I actually want to see the porosities scattered throughout at the Solid/liquid interface or nearby to that location. Any suggestions would be appreciated. I am attaching the GIF, please download to watch since researchgate isnt supporting it.
I am using COMSOL and doing a simulation on Laser keyhole welding. Thank You.
I think you have to use level-set, volume of fluid or phase filed method to be able to see the porosities after solidification. Are you using ALE to model the keyhole?
I already have the porosity in my model but its right at the centre. I am using level set. You can download the attached GIF to see the whole process. I actually want to see the porosities scattered throughout nearby S/L interface.
Are you modeling the beam trapping phenomenon? I think it may change the mechanics of the keyhole formation. I modeled the keyhole formation with ALE method and I'm having trouble to model using the level-set. I really don't know what I'm doing wrong in my model. I really appreciate your help.
That is actually my next step. I am using a simple Gaussian heat source up until now. For the last two days, I have been trying to include beam trapping/electromagnetism in my model. Let's see. The level set is pretty straightforward, you can state your problem here. I will try to answer if I can. Have you considered beam trapping already ?
Hi Akash,
in my opinion, you will not be able to see any porosity during the process at the S/L interface as long as you are using a well-distributed Gaussian heat source. Process porosity occurs mainly due to transient collapses of the keyhole, and you will only be able to reproduce that behavior by using a more realistic beam-matter coupling, e.g. as provided by the ray-tracing method. By doing so, you end up in multiple reflection points along the keyhole wall being associated to a more local energy input and thus ares of different temperatures and recoil pressure values in the end.
Best,
MB
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