welding radius arm

[sluginxlt]

i want to make wristed arms for the sas swap ill be doing on my ranger. ive done a good amount of welding and fab work, but only on regular and stainless steal. is the 79 radius arm a cast steal? i have a miller 180 mig welder and was wondering if i could weld the wristed arm with it?

[tekatlarge]

I don't believe the radius arms are cast of any type. Something in the back of my mind is saying they are just Stamped Steel.
I have a millermatic 185 and weld 3/16 with ease..