Thanks for your interest / assistance.
When I've selected Alexey, and place the cursor over the welder, all I get is a target reticle, as if the welder were an enemy unit.
Then I sniped the German who's using the welder; I get the eyeball indicator for the dead soldier (as expected), but Alexey still gets the target reticle over the welder, instead of the "boarding" symbol that you get when manning a gun or entering a vehicle.
I know the welder's not damaged, since I just shot the soldier who was using it.
