Josh, there is more than one way to skin a cat.
The usual way that we construct a pamor blade is by making the billet of pamor, and then welding it on each side of a piece of steel, effectively making a sandwich of it.
However, there are other methods of construction that we can use, and the pedang you have provided a pic of shows one of these methods.Sometimes a cross section through a blade will show a steel core, sometimes it will not, and the steel will only appear at the cutting edge, or edges. Sometimes there will be no core at all.
Whatever method we may use is really immaterial. The end result is what matters.
Yes, the making of pamor can be considered to be closely allied with what we refer to as "pattern welding".
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