If I am going to make a construction where there should be a beam of 45*45 but as an amateur, I take a 45*70 to be on the safe side.
In the middle of the beam, for some reason, a piece needs to be notched out, in this case, 25mm with a length of let's say 100mm.

On these 100mm, the beam is then 45*45, do I then have the same load-bearing capacity there as I would have had if I put in a 45*45?

/Niclas
 
Better! You likely have the drag loads at the edges.
 
It can matter how you make that notch. If you do it in a stupid way, creating a fracture point, you have weakened the stud.

But what do you mean by "load-bearing capacity"? In what way is the stud loaded? In house constructions, studs are never loaded anywhere near their breaking load.
 
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