Additive Manufacturing

Additive manufacturing (AM), commonly known as 3D printing, is a transformative approach to industrial production that creates parts by joining materials layer-by-layer from 3D model data. Unlike traditional subtractive manufacturing (which carves material away), AM is a resource-efficient process that empowers engineers to design complex geometries that were previously impossible to manufacture.

Some types of AM process are:

Laser Powder Bed Fusion (L-PBF / SLM)

A recoater blade spreads a thin layer of metal powder (typically 20–60 micron) across a build plate. A high-precision fiber laser selectively melts the powder particles to form a solid layer. The plate lowers, and the process repeats until the part is complete.

It offers the highest dimensional accuracy and surface finish of all metal AM methods. It is ideal for internal cooling channels and complex lattice structures.

Electron Beam Melting (EBM)

EBM is a powder bed fusion process that uses an electron beam instead of a laser. The entire build occurs in a high-vacuum environment to prevent oxidation. Before melting, the beam "scans" the entire powder bed to preheat it to high temperatures (often above 700°C). The vacuum environment makes it perfect for reactive materials. The high-heat build chamber act as a constant "stress relief," which prevents cracking in sensitive superalloys.

Directed Energy Deposition (DED / LMD)

Often referred to as Laser Metal Deposition (LMD), in this process, instead of a powder bed, a nozzle blows metal powder into a melt pool created by a laser on the part's surface. It functions similarly to a high-tech automated welder.

It has a much higher build rate than powder bed systems and can add material to existing parts. It is not limited by a build box size, allowing for very large components.

Ideal Applications for AM Powders:

• Intricate Cooling Channels: Ideal for printing internal cooling passages in turbine blades or heat exchangers that cannot be cast.
• Thin-Walled Components: Used for complex fuel nozzles and manifolds where precision is critical.
• Crack-Prone Superalloys: The high-temperature build environment (preheated bed) in EBM prevents thermal shock and cracking in brittle materials.
• Component Repair: Used to add material back onto worn aerospace parts, such as rebuilding the tips of turbine blades.
• Large Structural Components: Ideal for building large rocket engine nozzles or pressure vessels through DED that exceed the size limits of powder bed machines.