Hi @alijalil,
I’m SimScale you can assess the weld strength by modelling the weld geometry. The means separating the members by a small amount and joining them only at the weld interfaces.
This can be a time consuming job, so you want to avoid it if possible. Here are some points to keep in mind:
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Keep welded joints away from the extreme fibres of your members (for example weld to webs not flanges). This ensures your welded joints (the weakest part of your structure) are away form areas of highest stress.
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The design code that I use specifies a weld capacity factor of 0.6 (for general purpose welds). So, in general, you do not want to see stresses in welded areas greater than 60% of the parent material yield stress (after applying load factors).
I hope this helps.