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.
For using a laser to make a door, see Laser Cutter.
- 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.
- Here Comes The New Boss: To keep her costume secret from her dad, Taylor uses Stoneknapper's power to reshape the concrete and entirely seal off her alcove under the house.
I'd thought for a long time how I was going to hide my work from Dad, until Stoneknapper had shown me that the best kind of lock is one that only exists for you.
- The Palaververse: In Treaures, when Daring needs to stop her pursuers, she welds the hinges of a trapdoor to keep it from opening:
That wouldn’t be enough, though, and she glanced around for its hinges, found them, and lurched over as she fumbled a multitool out of her saddlebags. She yanked out the blowtorch attachment, making her much-abused teeth ache anew, and laid it down upon the hinges before pressed down on the button that made the little magical flame shoot out from the side.
It was dicey work, quickly passing it over the hinges to get them properly melted and beyond any hope of raising,
- In Aliens, the team welds the doors leading to Operations shut to keep out the Aliens. They come in through the ceiling instead.
- Galaxy of Terror: Used in the beginning by a fleeing crewman.
- Star Trek:
- Star Trek IV: The Voyage Home: Kirk uses a phaser to melt the lock on a door he locked some 20th-century medical staff in. The staff inside are a little surprised at the rather blatant breaking of the Prime Directive, even by the standards of a captain well known for playing fast and loose with said directive. Incidentally, this is the only time we see weapons used in the entire film.
- In Star Trek: Nemesis, Picard seals the door to the shuttlebay, but discovers that that door is the only way out.
- In the Star Wars galaxy, this is usually achieved by the simple step of "Apply lightsaber to control panel. Repeat as necessary." This backfires in A New Hope, when Luke shoots out a door control panel to hold off pursuing Stormtroopers, but the controls he just destroyed were also supposed to extend the bridge he needed to cross.
- A non-scifi example is mentioned in The Day of the Jackal. To prevent themselves from being kidnapped by the French Action Service, the OAS leaders rent the top floors of a hotel in Rome and weld shut the lift doors on all but one floor, which is guarded by their men.
- In Exit Strategy a hostile spaceship hacks the gunship Murderbot is on and tries to open the airlocks. Murderbot counterhacks the system and raises the temperature on the door locks to fuse them shut.
- Joe Pickett: In Stone Cold, Nate uses an industrial strength epoxy to seal the doors and windows of the guesthouse where the bodyguards of his target are sleeping: an act described as 'figuratively welding the lock'.
- Babylon 5: 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.
- Done just for the cool factor in The Dukes of Hazzard: The doors of General Lee are welded shut, driver and passenger systematically use the always-open windows.
- In an episode of Firefly, Saffron uses some sort of heating strip thing to weld shut the door to the cockpit.
- In Killjoys there is a type of Abnormal Ammo that can "bolt" a door shut.
- In Space: 1999, a mind-controlled crewman welds shut the door of a nuclear waste storage silo, to buy time for rigging it to explode.
- Stargate SG-1 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.
- When you and a few survivors first barricade yourselves in the Security Room in Dead Rising, Otis welds the entrance door shut. Oddly, when the army shows up, the door becomes un-welded (not destroyed) with no explanation.
- During your breakout from the Empirical in Star Wars: The Force Unleashed, 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 Space Station 13 first.
- And if you want to be nasty, it's possible to put people into lockers, then weld them in, preventing any escape without somebody else unwelding the locker.
- You can do this in Alien Swarm to close or open doors.
- A tool that is available to all perks in Killing Floor is the welder, it helps with defense by closing entry ways allowing the Zeds to be funneled into another entryway. This can also just slow down zeds as they have to spend a lot of time knocking down the door as you make your escape, however if the durability reaches zero the welded door will be destroyed. Previously welded doors can also be unwelded just in case if you need to escape or open up another path. The Support perk has stats that help with how fast they can weld and unweld doors, alongside that welding is also another good way to gain experience for the perk.
- It makes a return in the sequel Killing Floor 2 with Support not only being able to repair destroyed doors, but a trait exclusive to the Demolitionist perk, is that the doors they weld shut are booby-trapped to explode once destroyed (originally it was a perk skill but was turned into innate ability).
- Shows up a couple of times in Batman: Arkham City, forcing Batman to find a different route.
- Several of the Alien tie-in games-most recently Aliens: Infestation (A Metroid Vania taking place on a Xenomorph-infested Sulaco and Aliens: Colonial Marines (An FPS taking place on Acheron)-have lock-welding as a gameplay mechanic.
- Max Payne: In the second level of the game, the Rosco Street Subway, Max finds himself in a section of the New York subway that's been closed off since the 1940's (which is why a group of bank robbers are using it to tunnel their way into a bank vault on the other side), and the only door that leads back to the modern subway has been velded shut for decades. After dealing with the robbers, Max uses their explosives to blast his way through.
- DuckTales (1987): In "Where No Duck Has Gone Before", Launchpad squirts custard from the food synthesizer on the lock to the transporter room door to make sure the Kronks can't open it. This works until they begin burning through the door.
- The pilot of Teen Titans shows Starfire welding the door shut to keep out Mammoth. It doesn't hold long.
- Kid vs. Kat: 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.
- Buzz Lightyear of Star Command: Mirra does this in the pilot when the group are being chased by Zurg's mind-controlled Space Rangers.
- The Spongebob Squarepants episode Squid's Day Off has Squidward lock himself in his own home, barricade the front door and weld the lock to prevent himself from running back to the Krusty Krab so make sure Spongebob hasn't destroyed it yet and force himself to enjoy his shirking work for the day. Of course it fails and he plows through the barricade in an instant to run back to the (perfectly fine) Krusty Krab. And of course it turns out they forgot to put up the "Open" sign, so nothing would have happened anyway.
- Star Wars Rebels. In "Vision of Hope", the Ghost crew duck into the Dilating Door of a sewer tunnel, but then stormtroopers come along and weld it shut. Chopper tries to use his saw to remove the weld, but has made no progress when Kanan uses his lightsaber to cut the door open from below, nearly stabbing the droid in the progress. Chopper is not happy.