You know your welds are good when.....

[mushroomgrey]

your wrought iron cladding splits the core in half lengthwise!

 

[butcher_block]

i had that happen before but it was not steel i forged

 

[mushroomgrey]

i was going to just do an edge quench in brine , followed by oil , but the bugger slipped out of the tongs and dropped in the brine tank....

 

[Willie71]

i was going to just do an edge quench in brine , followed by oil , but the bugger slipped out of the tongs and dropped in the brine tank....

Bad luck!

 

[Will52100]

Och! Had that happen to a hawk I forged. The bit was O-1, what was yours?

 

[mooreknives]

I had this happen a couple of days ago on a San Mai Chef's knife, 5 layers of steel( mild steel on outsides, 15N20 on core of 1095, split the 1095 down spine of blade in heat treat, any ideas?

 

[Bailey Knives]

I have had that happen (not to that degree) on san mai knives I make. I keep it from happening with a clay coated spine. After I get the blade ground down, I coat the spine and any part of the handle area that will be touching the oil. It makes for not so severe a change in the movement of the steel and keeps that from happening.

 

[mooreknives]

Thanks Bailey, sounds good, will give it a try.

 

[Bill Burke]

I believe this actually happened from the core growing as the martensite transformation finishes. I have had it happen on chef's knives. this one was .119 above the heel, full tang tenish inch blade gyuto. it split right down the middle of the core. 52100 416 san mai.

 

[Travis Fry]

I believe this actually happened from the core growing as the martensite transformation finishes. I have had it happen on chef's knives. this one was .119 above the heel, full tang tenish inch blade gyuto. it split right down the middle of the core. 52100 416 san mai.

I had that happen about that bad with a wrought clad CruForge V cored blade, but it did it from the other (handle) end. Nearly made me cry. And I thnk you're right about the martensite expansion being the culprit.