[LWJ]

I am not a welder but a million years ago, I sold welding supplies.

My recollection with the nickel weld rod is that before and after welding, you need to heat soak it. Meaning, run it up super hot, weld, heat again, leave in a thermal blanket of some kind.

Don't take my word. Do the research. This type of welding has is super prone to failure.

Me? I would junk it.