TIG welding SILUMIN. AlSi9Cu3 (fe) Porsche Panamera gearbox housing repair after repair.

Complete process of repairing a gearbox housing made of silumin. Alloy of aluminum with silicon AlSi9Cu3 (Fe) I weld the deformed area using TIG welding - welding with tungsten in argon.
They brought me a Porsche Panamera gearbox for repair. The gearbox housing is damaged and has already been repaired by someone. But the gearbox leak was not eliminated. I remove the old welding as much as possible, in my opinion the previous repairs were carried out using an aluminum electrode.
I am using argon-arc welding to restore the deformed area.
What additive do I use, what current and what tungsten?
All the details of this process, as well as the nuances that arise when welding aluminum and its alloy silumin, see this video.
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