A cousin trope to {{Shoot Out the Lock}}: In speculative fiction, when you want the door to close and stay that way for a while, you weld it shut with a laser or similar device.

----
!!Examples:

[[foldercontrol]]

[[folder:Comic Books]]
* {{Deadpool}} once did this to a door to keep his sort-of girlfriend Siryn out of the room while he tried to kill the doctor who gave him his powers. Unfortunately, a melted lock isn't much use against a sonic scream.
* In ''{{Batman}}: Death by Design'', Exacto power-welds the door of a crane shut, sealing Batman, a journalist and a union boss inside just minutes before an explosion is due to send the crane toppling from the roof.
[[/folder]]

[[folder:Film]]
* In ''Film/{{Aliens}}'', the team welds the doors leading to Operations shut to keep out the Aliens. [[spoiler:They come in through the ceiling instead.]]
* In ''Film/StarTrekNemesis'', Picard seals the door to the shuttlebay, but discovers that that door is the only way out.
* ''Film/{{Star Trek IV|The Voyage Home}}'' did it earlier than ''Nemesis'' above; Kirk uses a phaser to melt the lock on a door he locked some 20th-century medstaff in. The staff inside are a little surprised at the rather blatant breaking of the [[{{Alien Non-Interference Clause}} Prime Directive]], even by the standards of a captain well known for playing fast and loose with said directive.
* ''Disney/TreasurePlanet'': Captain Amelia welds the lock on a hatch in order to keep out the rampaging pirates.
* ''GalaxyOfTerror': Used in the beginning by a fleeing crewman.
[[/folder]]

[[folder:Literature]]
* A non-scifi example is mentioned in ''Literature/TheDayOfTheJackal''. To prevent themselves from being kidnapped by the French Action Service, the OAS leaders hiding out in a hotel in Rome weld shut the lift doors on all but one floor, which is guarded by their men.
[[/folder]]

[[folder:Live Action TV]]
* In an episode of ''{{Firefly}}'', Saffron uses some sort of heating strip thing to weld shut the door to the cockpit.
* ''Series/BabylonFive':. Garibaldi and the Mars Resistance blow the lock on an Earthforce outpost (depressurising it to immobilise those inside) then weld it shut again. They might have just been repairing the damage however, because someone walks through the door later on.
* ''Series/StargateSG1'' did this with the Stargate iris on a few occasions. The first time it was done to the Beta gate after it had been stolen and used to steal from friendly worlds. The second was to their own gate to prevent any dial ins completely while they tried to extract Teal'c from the buffer.
* Done just for the cool factor in ''Series/TheDukesOfHazzard'': The doors of [[CoolCar General Lee]] are welded shut, driver and passenger systematically use the always-open windows.
* In ''Series/{{Space 1999}}'', a mind-controlled crewman welds shut the door of a nuclear waste storage silo, to buy time for rigging it to explode.

[[/folder]]

[[folder:Tabletop RPG]]
* The D20Modern [[TabletopRPG role-playing system]] has rules for doing this with [[{{Hellfire}} thermite]].
[[/folder]]

[[folder:Video Games]]
* When you and a few survivors first barricade yourselves in the Security Room in ''DeadRising'', Otis welds the entrance door shut. Oddly, when [[spoiler:the army shows up]], the door becomes un-welded (not destroyed) with no explanation.
* During your breakout from the ''Empirical'' in ''StarWars: TheForceUnleashed'', a cutscene shows a purge trooper welding shut a door through which you have to go. You also have to go through the purge trooper and two EVO troopers.
* In recent times, this has been abandoned in favor of cutting the wires, but let it be known that welding an airlock shut was in ''VideoGame/SpaceStation13'' first.
* You can do this in ''VideoGame/AlienSwarm'' to close ''or'' open doors.
* You do this in ''VideoGame/KillingFloor''. You can also unweld previously welded doors if the [[OurZombiesAreDifferent specimens]] start attacking you from a different angle, forcing you to escape through the door you were just trying to make impassable. [[FunetikAksent "I told you, I am WELDING this DOAH!"]]
* Shows up a couple of times in ''VideoGame/BatmanArkhamCity'', forcing Batman to find a different route.
* Several of the ''Franchise/{{Alien}}'' tie-in games-most recently ''Videogame/AliensInfestation'' (A MetroidVania taking place on a Xenomorph-infested ''Sulaco'' and ''Videogame/AliensColonialMarines'' (An FPS taking place on Acheron)-have lock-welding as a gameplay mechanic.
[[/folder]]

[[folder:Web Original]]
* In the [[Webcomic/MSPaintAdventures MSPA]] [[InteractiveComic Fan Adventure]] ''Divine Intervention'', Zoey's dad shoos her in her room and attempts to welds the lock. He only succeeds at burning the door down [[spoiler:so he drops a safe door in its place]].
[[/folder]]

[[folder:Western Animation]]
* The pilot of ''WesternAnimation/TeenTitans'' shows Starfire welding the door shut to keep out Mammoth. It doesn't hold long.
* Alexander Luthor welds the vault door to slow down the Crime Syndicate in the direct to DVD ''WesternAnimation/JusticeLeagueCrisisOnTwoEarths''.
* ''WesternAnimation/KidVsKat'': Kat does this several times to the Kat Kommander's rebellious son in "Rebel with a Claw"; once to seal him in a room to get him out of the way, and later to seal him in his transport module before they launch him back into space.
* ''WesternAnimation/BuzzLightyearOfStarCommand'':also does this in the pilot.
[[/folder]]
----