Hi and welcome.
I took a quick look on the internet and you will need at least 7kva (not kw) for 160 amp welder so thats is somewhere in that area. But still check is your welder suited for generator and is the generator suited for welding machines. If its not specified in the manual dont try it because you can fry your welder and generator, unless someone has tried it and it worked. If you are doing a one job might be better to rent it, but for longer runs have you considered engine driven welders.