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I've noticed that "On Hit" effects proc any time an enemy is hit with a spell of any kind. I guessed that 'On Melee Attack" would be similar, but only when the attack is made with a melee weapon. This seems to be true since the axe procs off spells such as HotA and Seismic Slam, though they still have AOE attributes caused by a melee swing. However the axes do not proc when using the Whirlwind ability, is Whirlwind not considered a melee attack?
The specific effect that is granted by the legendary weapon Stalgard's Decimator, only procs on resource generators (http://us.battle.net/d3/en/forum/topic/11914801382).
On the same note whirlwind does proc effects just at a reduced rate due to it's higher attack rate. According to this list (http://www.d3maxstats.com/?p=procrates) the proc rate of whirlwind (on any rune) is 13%.
