I bought a grill to put into the compressor that I aom converting into
a grill/pig roaster.

It is described as "stainless", but I recall that Chinese grill
stainless steel is something special.

As I may need to alter it a little bit, add tabs or drill holes, I
want to know what kind of stainless is it and what kind of welding rod
to use on it, and also, how can I drill it.

i