This build revolves around two augments: [Ironclad Charge] and [Iron Shrapnel].

[Ironclad Charge] allows you to massively increase your armor for a short time, this armor bonus is taken into account when casting your Iron Skin (2) ability and will get your armor buffer high enough to tank pretty much anything out there.

1. Use [Ironclad Charge] on a large'ish pack of enemies
2. Use Iron Skin
3. Congratulations you're basically invincible

Here's a quick example with 8 enemies in the Simulacrum.