You can TIG weld with the non-adjustable helmet if the shade happens to be ok for what you are doing. Same thing with using large MIG wire, 3/2" or larger, (yep it comes bigger!
) since most non-adjustable types are #10 and a #14 is recommended for that kind of welding and #14 lens sometimes are hard to find, at least here, I used a 10 or 11 with dark glasses under the helmet for the larger wire but sometimes I even doubled my lens using a #10 and a #4 together when I did not want the dark safety glasses.
EDIT, I just realized I misunderstood what you asked about TIG welding and those hoods. The sensitivity does need to be adjustable to work right with a TIG otherwise it could flash on and off, I at first thought you were talking about the shade adjustment, Sorry about that!