The Virai make use of heavy weapons much in the same way that their biological opponents do. They'll have a weapon platform "manned" by various drones. In this release for Beyond the Gates of Antares, there are two new weapon crews available. One's the Heavy Support and the other's the Fractical Disintegrator.
From the website:
The Virai continue their mining operations – they arm their support teams with the new mag heavy support and Fractal Disintegrator to keep the enemy at bay!