🚀 go-pugleaf

In our Welding Metallurgy and Processes laboratory we welded some
1/4 hard 304 Stainless Steel:
	(1) E308H SMAW: 75, 95, 105 Amps 10-12 ipm CC DC+
	(2) E308T3 FCAW: 180, 200, 230 Amps 33 Volts 17 ipm CV DC+

Etched by immersion in Kaling's with poor results.
Electroetched in 10% Oxalic Acid, 5V (I forget the amperage), 45 seconds!!

In order to get significant definition of the grain boundaries, at least
45 seconds was required.

Base metal shows mechanical twins, but generally equiaxed (some banding).
Fusion zone is mostly cellular dendritic, with epitaxial nucleation at
the boundary.

Absolutely no sign of a HAZ, no recrystallization, no grain growth, nothing.

Also expected to see sensitization, but suspect very low carbon content
(i.e. 304L, not 304).

Any ideas?


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