How Wire-Feed Additive Manufacturing Works
Wire-Feed Additive Manufacturing is a Directed Energy Deposition (DED) process in which metal wire is continuously fed into a locally generated melt pool. A concentrated energy source melts the wire together with a controlled portion of the underlying material, creating a metallurgical bond between the deposited material and the substrate.
During the process, the energy source and wire feed are moved relative to the workpiece along a programmed toolpath. The deposited material solidifies behind the melt pool, forming a weld bead. By placing multiple beads next to and on top of each other, three-dimensional metallic structures can be built layer by layer.
Compared with powder-bed additive manufacturing processes, wire-feed DED is particularly suited to larger components and higher material deposition rates. The process can be used both to manufacture near-net-shape components from the ground up and to add material to existing parts, for example for feature addition, modification or repair.
EVOBEAM applies wire-feed additive manufacturing using both laser and electron beam energy sources. The appropriate process configuration depends on the material, component geometry, required deposition rate, build accuracy and production requirements.
Laser and Electron Beam as Energy Sources
Wire-feed additive manufacturing can be performed using different concentrated energy sources. EVOBEAM provides process solutions based on both laser and electron beam technology, allowing the energy source to be selected according to the material, component size, required deposition rate and production environment.
Laser-based wire-feed additive manufacturing uses a focused laser beam to create the melt pool while metal wire is continuously supplied to the process zone. EVOBEAM combines this approach with processing under reduced pressure in its LaVa-based additive manufacturing technology. The optical beam delivery provides flexible energy input and precise control of the interaction between the wire, melt pool and substrate.
Electron beam additive manufacturing uses a focused electron beam as the energy source and operates under vacuum. The high available beam power and efficient energy transfer make the process particularly suitable for large metallic structures and applications requiring high deposition rates. EVOBEAM offers this technology in cooperation with Sciaky.
Both approaches use wire as feedstock and follow the same fundamental DED principle, but differ in energy coupling, process environment, achievable deposition rates and machine configuration. The optimum technology is therefore selected according to the specific manufacturing task.
Process Parameters and Control
The quality and geometry of a deposited structure are determined by the coordinated control of the energy source, wire feed and relative movement between the deposition head and the workpiece. Stable interaction between these parameters is essential for reproducible layer formation.
- Energy input — laser or electron beam power determines the amount of energy available to melt the wire and the underlying material and therefore influences melt pool size, penetration and deposition behaviour.
- Wire feed rate — controls the amount of material supplied to the melt pool and must be coordinated with the available beam power and travel speed.
- Travel speed — influences the energy input per unit length, bead geometry and thermal conditions during deposition.
- Beam and wire positioning — precise alignment of the energy source, wire and melt pool is essential for stable material transfer and reproducible bead formation.
- Layer strategy — toolpaths, bead overlap and layer height determine how individual deposits are combined to form the required three-dimensional geometry.
- Process environment — vacuum or reduced-pressure conditions form an integral part of EVOBEAM’s electron-beam and LaVa-based wire-feed processes and influence both material behaviour and system configuration.
In automated systems, the deposition parameters, beam control, wire feeding and machine axes are coordinated within the process control system. This enables programmed build strategies to be reproduced consistently across multiple layers and manufacturing cycles.
Materials and Deposition Characteristics
Wire-feed additive manufacturing can process a wide range of weldable metallic materials, provided that suitable wire feedstock and process parameters are available. The choice of energy source and process environment depends on the material properties, component geometry and required build characteristics.
- Titanium alloys — particularly attractive for wire-feed additive manufacturing due to the high material cost and the potential to reduce material waste compared with machining components from solid stock. Vacuum processing also provides a controlled environment for reactive titanium alloys.
- Nickel-based alloys — used for demanding components requiring high-temperature strength and corrosion resistance, particularly in aerospace and energy applications.
- Steels and stainless steels — suitable for the manufacture, modification and repair of larger components where high deposition rates and efficient material utilization are required.
- Other weldable alloys — additional metallic materials can be processed depending on wire availability, metallurgical compatibility and the selected laser- or electron-beam process.
Wire-feed DED typically produces near-net-shape structures rather than finished component surfaces. Depending on the required dimensional accuracy and surface quality, subsequent machining may therefore be integrated into the manufacturing route. The combination of additive deposition and final machining can significantly reduce material consumption for components that would otherwise require extensive machining from solid material.
Applications and Process Capabilities
Wire-feed additive manufacturing is primarily used where high material deposition rates and the production of medium to large metallic structures are required. Compared with powder-bed processes, the technology prioritizes build rate and component size over fine geometric resolution and typically produces near-net-shape structures for subsequent machining.
Laser Wire-Feed DED
Electron Beam Wire-Feed DED
EVOBEAM’s laser-based wire-feed process combines a fiber laser with wire deposition under reduced pressure. It is particularly suited to medium-sized structures where a balance between deposition rate, process flexibility and geometric control is required.
Typical deposition rate: 200–500 cm³/h, depending on material and beam power
Energy source: Fiber laser
Process environment: Reduced pressure or vacuum, depending on material requirements
Beam manipulation: Scanner or wobbler available
Wire feeding: CNC-controlled in-vacuum wire-feed system
Process monitoring: Thermal camera with up to 1 kHz acquisition
Typical applications include near-net-shape manufacturing, feature addition and the production or modification of medium-sized high-value components.
Electron beam wire-feed additive manufacturing is targeted at larger structures and applications requiring substantially higher deposition rates. The process operates under vacuum and combines high beam power with programmable component and beam movement.
Typical deposition rate: 500–1500 cm³/h according to the current EVOBEAM technology specification
Electron beam power: up to 42 kW
Acceleration voltage: 60 kV
Maximum workpiece size: up to 5790 × 1220 × 1220 mm, depending on machine configuration
Rotational components: up to 2440 mm diameter on suitable configurations
Wire feeding: optional dual wire feed for increased build rates or customized alloy deposition
Process control: closed-loop molten-pool control
This configuration is particularly suited to large aerospace and structural components, high-value alloys and applications where high deposition rate can significantly reduce the amount of conventional machining required.
From Process Development to Production
Successful wire-feed additive manufacturing requires more than the selection of an energy source and deposition rate. The complete manufacturing process must be developed around the material, component geometry, build strategy, thermal behaviour and required final properties.
EVOBEAM supports the development of application-specific wire-feed processes from initial feasibility trials through parameter development and process qualification to the configuration of an industrial production system. Build strategies, wire feeding, beam parameters, component manipulation and process monitoring are coordinated to achieve stable and reproducible deposition conditions.
For laser-based applications, EVOBEAM combines wire-feed deposition with its LaVa technology, using reduced pressure to provide a controlled process environment. For high-deposition-rate electron beam applications, EVOBEAM integrates Sciaky EBAM technology for the manufacture of large metallic structures under vacuum.
The resulting machine configuration can be adapted to the required component dimensions, axis configuration, vacuum system, beam source and level of automation. This enables the additive process to be transferred from development into a reproducible manufacturing environment.