Connecting two power supplies with same voltage rating to increase current output?
Possibly. Possibly not. It depends on whether your power supplies have linear or foldback current limit. 

The problem is that the power supplies don't have exactly the same output voltage. The power supply with the highest output voltage will provide all the current that the circuit is requiring until it reaches it's current limit. 

What happens then depends on the current limit circuit inside the power supply. If it has linear current limit, its' voltage collapses down to the point where the other power supply begins to supply current. 

All is good.

However, if that first power supply has foldback current limit, it will effectively drop out of circuit and the other power supply will attempt to supply all of the current. It, too, will go into current limit. And the output voltage will fall. 

You have to test your particular power supplies and see how they behave while in current limit.