They make a plasma cutter type attachment as well.
The wobble weld if much the same as the L-R movement electrode tig welding for larger gapped weld areas. From the looks of it it is adjustable in size.
I thought it was also cool that the stitch welding to prevent buckling is largely not needed.
They do have a wire feed for filler wire.
https://www.youtube.com/watch?v=NmZ_Wv6QHeI