Ahhhh!!! you were brazing and not melting the steel wire. I misunderstood.
That joint looks great and should work well.
Do you know the melting temperature of your rod? It may be hot enough to temper the upholstery wire but the stress where you joined those probably isn't high enough to cause it to bend even if it was weaker. Anything over about 500F will soften the steel to some degree. I have no idea how a joint like that will affect fatigue life but the stress can't be high enough where you made that joint to cause any concern. It simply isn't constrained enough to be highly stressed at that location.
I'd be curious to see a test where you join pieces the same way and then force them to fail...one in torsion and one bending. This will hopefully build your confidence.
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