Mike, I would be interested in how you make out. The machine they would have used would have been either an optical-emission spectrometer, or an x-ray florescence spectrometer. The optical emission unit will leave a small (5/16" diameter) 'burned' area where a high energy source causes and arc, the emitted light is then broken down by a diffraction prism, then measured to determine each % quantity of each element the machine is set up for. You need to know this so they don't set it up to leave the arc mark in an exposed area. The x-ray florescence machine will not leave a mark. Not all labs have that machine, because of it's cost.
I'd want to know the chemistry before you have a welder pick his own filler material, so that you get a good weld, with regard to metallurgy, mechanical properties and cosmetics.
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