[EricH]

<R92-H> deals with aluminum. This was much clearer in the earlier revisions of the Manual, which read, after TU#4, "<R92-H> Raw aluminum sheet, 90° angle, u-channel, tube, bar, that is not sold in pre-perforated or pre-punched form." (Also note the revision log, which notes that Revision D had a revision to clarify raw aluminum usage.) The placement of the "Welding rod" addition (Rev. G) may have thrown you off a bit.

In other words, nope, find some other way of attaching your magnets.

EDIT: I'm a little bit surprised at whoever does the Updates and associated Manual revisions right now. The current rule, from Rev. K, reads:

H. Raw welding rod, aluminum sheet, 90° angle, u-channel, tube, bar, that is not sold in pre-perforated or pre-punched form.

This hasn't been changed since TU#7. However, TU#7 has the same rule reading

H. Raw aluminum welding rod, sheet, 90° angle, u-channel, tube, bar that is not sold in pre-perforated or pre-punched form.

I'd much appreciate someone bringing that to the GDC's attention; the rule change wasn't the same between the Update and the Manual.