The picture of the chef knife is Ikkanshi Tadatsuna (all Ikkanshi Tadatsuna western handle knives are made the same way), and it is one body from the tip to the end of the handle.
The bolster is normally welded, but this one is not welded. It prevents to be over 1000 centigrade again by sparks.
It is also clean looking and no sanding marks or welding marks around the bolster.
There is the way to put together the handle and blade by welded.