Its really hard to specialize in weaponsmithing when blades are so rare to find. My clan has been scavenging for metal since the wipe and only found 1 blade. This is rather frustrating, especially when you look at the resources the other specializations are able to gather.
Blades may end up being craftable once metalworking and forging are implemented. However, for the time being, they are only items you can scavenge. There are a lot of factors that may explain why you aren't getting blades. But, since the latest wipe, I know that my tribe has been looking for blades a lot and have had a decent amount of success.