Samurai Sword - Forging Thereof

Traditional forging of samurai sword

Category:

Education

[knifesmith]

@Wyndstarthedruid

Nope. A lamination line is different from a hamon (which is a line of transformational crystal types between the hardened martensite edge and the softer pearlite back). See the video "applying clay to the edge". The hamon is indeed on both sides, but can be different on each side (it's a property of the shallow hardening nature of the alloys used in this type of blade).

[knifesmith]

The narrator is a bit condescending eh? "When you have no written language..." Whaa?

And on the clay/hamon issue. The clay goes on the back 1/2 of the blade (along the spine -mune) to serve as thermal insulation and keep the quenchant (water) from cooling the steel along the back fast enough to hit the martensite transformation point. So the edge gets hard (martensite), and the back stays relatively soft (pearlite and other forms of crystalline steel).

[Wyndstarthedruid]

@TheHaymanator it goes on no side, the clay is put on the inner core, then inserted into the outer layer, there is a hamon on BOTH sides. and infact, all laminated steel has a hamon line, it just has to be polished to bring it out

[aznmeowmeow]

@MrModernNinja what is the clay made out of?

[MrModernNinja]

@TheHaymanator The clay goes on the side where you do not wish to show the hamon (the dark wavy line on the edge of the sword)

[KNIGHTANGELSBLADE]

Thanks never got to see this one. Great to find on here..

[TheHaymanator]

which side do u put the clay on?

[moe2744]

very nice video thank you ceiliog for this nice video..