I was thinking that it would be cool imo to implement the weld spots around the ns maps to give a small amount of res upon completion of being welded, like 5 res per spot. Although not terribly generous, the free res would certainly come in handy at the beginning of the game when the teams are hurting for res. This will encourage the commander to give the marines welders in the beginning of the game, which themselves encourages teamwork, i.e. welding each other, etc.
The aliens benefit strategically from this as well. Any player, experienced or noob, could quickly learn how to use the weld spots as ambush spots, as the marines are unable to defend themselves while they are welding. So the aliens can easy manipulate these spots to their advantage and rack up easy kills.
combine this with my "dynamic weld icons" idea adn i think it would be a positive attribution to the game.