How to weld Cu high conductivity alloy MSP1

#1
How to weld this material?
I need the suggestions from you.
We are now doing with this material but it is very sensitive with welding condition:
- When current is increase => cutting case
- When welding speed is decreased => cutting case
- When arc length is decreased => good quality

So, what is the difference between (increase current or decrease speed) and decrease arc length.
(Constricted TIG welding process, Ar + 30%He, back shielding: 3 L/min, Shielidng gas: 10 L/min, other conditions are keep in constant.)
Material source: http://www.mitsubishi-shindoh.com/en/products/material/msp1.html
Thanks in advance!
 
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