Alternatively, with four Corrosive Projection auras, he will have no armor at all, negating any bonus from corrosive damage. His health has no weaknesses or strengths.
Vay Hek is invulnerable to most, but not all status effects. Periodically proccing him for Radiation is a good way to keep him relatively harmless during his invulnerability stage as he will tend to target his own units more often than players.
Blinded and Radiation procced enemies will still trigger the Fomorian Console, rendering this method not as effective. Resort to other forms of procs to hinder their movement such as Sound Quake or Molecular Prime instead.
Alternatively, using Hydroid's Undertow at the center of the platform will douse all the consoles in his range, keeping it safe from the hack.