What Is Galvanealed Steel?
Galvanised steel is a steel surface that's received a galvanized coating that has been annealed, which is a process of heating and allowing to cool slowly, to make it easy to paint.
How does the Steel Get Shaped?
Next the steel doors go through a process called Shearing. This process cuts the sheet metal to the specified size needed for manufacturing.
Spot Welding The Metal Doors
One of the most important parts of the metal door manufacturing process is called Spot welding. Spot Welding is used to attach hinge, closer and lock reinforcements within the body of the door, as well as securing any additional stiffeners.
After the steel shell is assembled, a core is then added to the door. The core is used not only to provide a more rigid door, but also allows for additional features such as energy efficient door insulation, bullet resistance and sound proofing. There are three types of door cores: Honey Comb core, the steel stiffened core, and finally the polystyrene core. While in past the honeycomb core was most popular, environmental efficiency in modern buildings has demanded that a polystyrene core door become an industry standard.
Finishing The Door With Some Edge Welding
Finally, after all the components of the door are assembled, the metal door is then placed through a machine called an edge welder. This automatic welder merges both of the edges of the two door halves into one finished product.
The next step is to move the door into the finishing room. Here workers grind the edges of the weld down to a smooth finish, and make any finishing touches by sanding imperfections and stains. The door is then inspected one last time for quality before being mounted to hangars and entering the painting booth.