Welding is method of destroying towers and reactors at a lighting speed (especially towers).
It's all about destroying only blocks next to connectors (weldings), that mount other blocks to the basement. When all of the welds are destroyed the rest of blocks will be removed automatically.

There are 3 types of towers: top, middle and bottom. When battle begins and you go to weld bottom tower and you have time when enemies aren't attacking you, sometimes it is worth to wait and destroy last weld on connector - therefore you'll get more points.
However, when enemies are attacking, or you just want to rush off - destroy then as fast as you can.
                                            
           Welds on connectors (red)
                   Click to expand -->

Like I said before, there are 3 towers on each map: top, middle and bottom, their name depends on possition on the map, look:
                                                                                              

Reactor unlike towers have 4 connectors.Always try to destroy them along welds - it'll save your time.

Reactor connectors (red)
Click to expand

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