There are a few theories about the function of the Ganja . An esoteric one is that the Ganja is like a stopper on the base of the blade to hold the spirit in the blade .
Mechanically it may have been easier to add a Ganja to widen the blade than to try to forge it all in one piece .
I'd like to see a full shot of the blade profile (dapur) .
The pamor is laminated to both sides of a steel core ; a sandwich of sorts .
Then there are blades made entirely from pamor material with no core .
And
For more learnin'
http://www.vikingsword.com/ethsword/
scroll down to Asia