Editing Welder (section)

==Tactics==
*A squad should have a member committed to welding a door often if they want to keep it closed. This often falls on to the Support Specialist but other teammates might need to take over the duty for Support Specialist to clear the excess trash and open breathing space for team.
*Taking over the door generally requires communication, welding player using voice command "''Help!''" or "''Weld the doors.''" should be enough of a clue for some other player to take the duty for a while. When door is about to give in and break from the specimen attacks "''Look Out!''" voice command can help team to pay attention and clear the horde in a timely manner before getting flanked.
*If two nearby doors are welded with different integrity, then specimens will generally attack the weaker door first. If most doors leading to the squad are near equally welded without giving way for any secondary stream, they will attack all of them eventually.
*In case a narrow door or any door nearby the hold position can be cleared easily by splash damage through an opening, it's best awaiting a huge aggro of multiple specimen on it first before attempting it. A small zed attacking a narrow door will prevent bigger specimen to tear it down quickly and its damage can be out repaired easily. Doors that are welded outside of team's view or too wide, must be cleared immediately or welded for a while to prevent any bad surprises, depending on wave's progress of specimen left.
*Spamming explosives at crosspaths to score huge chunk of kills cause specimen to respawn all over the place to take the least resistance path. When this happens they will take their time and start attacking nearby doors to flank the team. Listen for any noise of scratching to keep welding or clear the doors along a late wave.
*The door health display on the welder stays active as long as you are near the door, not necessarily facing it, allowing you to keep an eye on the door without having your back to the battle.
*It should be noted that the Welder is always fully discharged when a player spawns, and as such can make it much more problematic to weld a door in the first few seconds of a game. Welding a door outright is not crucial as early as first wave where only low threats appear. Upon respawning you will still have enough time to quick tap a close enough door before heading to the trader.
*Be careful while welding one door with teammates. If you turn to another player next to you while welding a door you can harm him. It does not do that much damage, but it also costs kevlar. Some players use this as a [[Griefing]] device to kill others or a way of punishing players who are fixated on welding unnecessary doors.
*You can actually kill a specimen with a welder by letting him come close to the door, point the welder at the door, start welding and then rapidly turn to specimen. He will take some minor damage. Repeat until he is dead. This can be fun if you are the last man standing, all teammates are dead, and the last specimen is a clot. This exploit happened after [[Summer Sideshow]] of 2013 and haven't fixed since, as it might be intentionally left in there.