Rate that Co Build!
I've never played in a clan match and so have had to play with many pubbies, pubbies that you need to co-operate with but be self-sufficent as they are very unreliable and thusly made this build, as I perfere living longer and contributing to the team.
Armor 1 first is for focus rushers and can be alternated with weapons if you desperately want an early shotty.
The welder makes it so you can make people live MUCH longer then normal and to repair CC, resupply and if someone else has welder = invincible like HA.
HMG is all purpose, better then GL for HA useage (HA = slow tank that absorbs damage)
Also, its good to have 'meatshields' when you or another pubbie only get HA, the only bad part of this strategy is lack of another welder or a lot of onos.