My previous boat had the TIG (?) wire in place of cotter pins. It worked great for several years of day sailing and short cruises in inland waters.
For the record, it was purchased in welding sticks or rods, not from a spool. I've never done more than spot welding so I can't comment on the variations of wire.
I have cotter pins at the moment, but will change over to welding wire as I have to change out the pins.
So much easier to make small adjustments and much less work when the rig comes down for the winter.
Edit: Got me to thinking.... RIP Tom Rapp of TR Rigging.. you were a nice guy and missed. http://www.legacy.com/obituaries/tim...21#fbLoggedOut