Read on only if you don't mind reading spoilers for the film.
The Hulkbuster was designed to match the incredible strength of the Hulk should he ever need to be subdued, being powered by multiple Arc Reactors in order to grant the strength required for such a task. The suit has enough strength to send the Hulk flying two streets away with one punch. Using a new propulsion system, each section can fly to the user from a drop pod hovering around the combat zone and automatically assemble into the Hulkbuster Armor. Despite being composed of individual parts, the XLIV is still able to sustain blows from the Hulk, unlike the XLIII. It has many different variations of its limbs. For example, after having the initial left arm removed, a replacement with a rapid-fire hydraulic punch was used to repeatedly bash the Hulk's face at an as of yet determined, but still brutal velocity. The Hulkbuster is incredibly strong, shown when both it and the Hulk throw punches that brutally collide, creating a gigantic shockwave so powerful it shatters windows and glass structures from miles around. It was also capable of shooting broader and fiercer repulsor blasts from its hands. It was capable of flying like its predecessors, however, because it was extremely heavy and enormously powerful, it could not fly for extended amounts of time without expelling large amounts of energy too quickly.
Avengers: Age Of Ultron
After Wanda Maximoff manipulated Doctor Banner into turning into the Hulk, Tony had no other choice but to deploy the system as all of the other Avengers with the exception of Clint Barton were defeated. The armor was deployed from orbit and came split into two separate parts that assemble itself onto the Mark XLIII. After unsuccessfully trying to reason with the giant monster, the Hulkbuster engaged the Hulk in an intense and incredibly destructive battle. Hulk damaged the armor, Tony called for extra parts and used it's many capabilities to try and knock the Hulk down or fly him out of the city. After the fight intensified and destroyed several city structures, Tony desperately resorted to dropping him through a building still going through construction, this seemingly calmed the Hulk enough that Stark could knock him out with a final massive punch.
Avengers: Infinty War
To be added
- The Hulkbuster armor made it's debut appearance in comic issue Iron Man (vol. 1) #304 (May 1994).
|Iron Man armors|
|Primary Armors||Mark I | Mark II | Mark III | Mark IV | Mark V | Mark VI | Mark VII | Mark XLIII | Mark XLIV | Mark XLV ||
|Iron Legion||Mark VIII | Mark IX | Mark X | Mark XI | Mark XII | Mark XIII | Mark XIV | Mark XV | Mark XVI | Mark XVII | Mark XVIII | Mark XIX | Mark XX | Mark XXI | Mark XXII | Mark XXIII | Mark XXIV | Mark XXV | Mark XXVI | Mark XXVII | Mark XXVIII | Mark XXIX | Mark XXX | Mark XXXI | Mark XXXII | Mark XXXIII | Mark XXXIV | Mark XXXV | Mark XXXVI | Mark XXXVII | Mark XXXVIII | Mark XXXIX | Mark XL | Mark XLI | Mark XLII|
|War Machine Armors||Mark I | Mark II prototype | Mark II | Iron Patriot | Mark III | Mark IV|
|Related Armors||Iron Monger | Whiplash (Mark I • Mark II) | Hammer Drones|