How to Attach Spade 10 AWG Solid Copper

Agree a crimp is going to fail. For solderless: I would use a spade (like WBT) that can be screwed down onto the wire for a solid tight connection. Even drilling a hole into the shaft of the spade, threading it and using an allen head set screw will do a great connection (I would file the wire to have a flat spot where the set screw meets the wire, to make it (nearly) impossible for the wire to pull out.

First solder at high heat using the least amount of solder to make a perfect connection. Then you can crimp. Do not crimp first and then solder.

Do not crimp first and then solder.
Reb1208

And why is that?
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I one crimps at all, it should be done first, to obtain the best/most metal to metal contact. Minimum solder between the actual conductors is preferable. Once soldered, a crimp is wasted effort. Obviously- solder is a conductor also, but none will be as good as the spade or cable's metal.

It never ceases to amaze me how much information you read on the internet that is outright wrong.

If the average person with average skills solders after crimping, the crimped connection will tend to be compromised.

In this case, we are talking about a solid core wire. So once again, I advice soldering at HIGH heat using a minimal amount of solder. Then crimp the connection.

If the wire to be connected to the spade is stranded, I would advice crimp only.