Lew, no weld line. The blade is made from one piece of metal. But there is a line running in the middle of the blade. From that point to the handle, the blade is a bit thicker. It then tapers towards the edge (which is very sharp).
Katana,
As requested : first a view of the top of the shaft, followed by the bottom (which is round). You might notice the copper ring at the bottom.
The handle is also decorated with some geometrical design.
