WAAM vs Traditional Manufacturing: Key Differences, Costs, and Best Use Cases

Written by

DEEP Manufacturing

Published

2026-06-16

Selecting the right manufacturing route can have a significant impact on cost, lead time, material utilisation and supply chain resilience. While casting, forging and machining remain well-established processes, Wire Arc Additive Manufacturing (WAAM) is increasingly being considered for a growing range of industrial applications.

This guide compares WAAM with traditional manufacturing methods, exploring the key differences, advantages, limitations and best use cases for each.

What is WAAM?

Wire Arc Additive Manufacturing (WAAM) is a large-format metal additive manufacturing process that uses wire feedstock and an electric arc to build components layer by layer. It is essentially a form of metal 3D printing.

The process is closely related to robotic welding. Instead of removing material from a billet or pouring molten metal into a mould, WAAM deposits metal only where it is needed. This creates a near-net-shape part, which can then be machined, inspected and finished to meet the required specification.

WAAM is particularly suited to large-scale metal components, low-volume production, high-value materials and applications where lead time, material efficiency and supply chain resilience are important. WAAM can also complement traditional manufacturing methods, allowing manufacturers to add features to cast, forged or fabricated components, repair existing parts or combine multiple production routes within a single project.

WAAM vs traditional manufacturing: The core differences

The most suitable manufacturing route depends on factors such as part size, complexity, production volume, lead time and cost. The table below highlights the key differences between WAAM and traditional manufacturing methods such as casting, forging and machining.

Factor	WAAM	Casting / Forging / Machining
Process	Builds components layer by layer using wire feedstock and an electric arc	Shapes, pours or removes material to create the final component
Best suited to	Large, complex, low-volume metal parts	Standardised, repeatable and high-volume production
Tooling	Minimal or no dedicated tooling required	Often requires moulds, dies, patterns, forgings or billets
Material utilisation	Near-net-shape manufacturing with lower waste	Can involve significant waste, particularly when machining from solid
Lead time	Often shorter for prototypes, one-offs and low-volume production	Can be extended by tooling manufacture and material procurement
Geometric flexibility	High design freedom and part consolidation opportunities	Often constrained by tooling and manufacturing limitations
Surface finish and tolerance	Typically requires post-processing and CNC machining	Mature finishing routes with predictable tolerances
Certification	Requires robust process control, inspection and qualification	Established standards and mature supply chains
Repair and modification	Can add material to existing components	Usually requires replacement or extensive rework
Production volume	Strong for low-volume, customised components	Strong for high-volume manufacturing

WAAM vs machining from solid

Machining from solid is a subtractive manufacturing process where material is removed from a billet, forging or plate to create the final component. It remains essential for producing precise features, tight tolerances and high-quality surface finishes.

The challenges arise when manufacturing large, complex parts from expensive materials such as titanium, nickel alloys and stainless steels. In these applications, a significant amount of material may be removed during machining. This is measured by the buy-to-fly ratio, which compares the weight of material purchased with the weight of the finished part.

WAAM reduces material inefficiency by producing near-net-shape components that closely match the final geometry, requiring less material removal during finishing. Research published by MDPI highlights WAAM's high deposition rates, low production times and near-100% material efficiency compared with traditional subtractive manufacturing.

In many applications, the most effective solution is a hybrid approach, with WAAM producing the preform and CNC machining delivering final tolerances and critical features.

A metal 3D printed hemisphere on a two axis manipulator with WAAM robott.

WAAM vs casting

Casting is a manufacturing process in which molten metal is poured into a mould and allowed to solidify into the required shape. It is widely used where production volumes are high and tooling costs can be spread across multiple parts.

For low-volume production, however, casting often requires pattern making, mould manufacture and foundry capacity, which can increase lead times. Casting can also be susceptible to inclusions and internal voids that must be managed through inspection.

WAAM builds components directly from a digital model, removing the need for moulds and patterns. At DEEP Manufacturing, every layer is monitored throughout the build, allowing potential defects to be identified and addressed during production. This process control supports the manufacture of high-density components and can make WAAM attractive for replacement parts, customised designs and large components with low production volumes.

Casting remains a strong choice for repeatable high-volume production, while WAAM offers greater flexibility and shorter lead times for one-off and low-volume applications.

WAAM vs forging

Forging shapes metal through compressive force, often using dies, presses or hammers to form a component. It is a mature manufacturing process and remains highly valued for producing parts with proven mechanical properties, particularly where strength, fatigue performance and repeatability are critical.

However, for large or low-volume components forging can be a lengthy process involving long procurement routes, dedicated tooling and limited supplier availability. Dies may need to be produced before manufacture begins, and large forgings often depend on specialist capacity that is not always readily available.

WAAM can provide a different route for producing large-scale metal components, offering greater speed, design flexibility and supply chain resilience. By building near-net-shape parts directly from wire feedstock, WAAM can reduce dependence on long-lead forgings and support one-off, customised or low-volume production.

For sectors such as subsea, maritime, energy, aerospace and defence, this can be valuable where component availability, certification and delivery certainty are of the utmost importance.

WAAM vs powder-based metal 3D printing

Powder-based metal additive manufacturing processes, such as Laser Powder Bed Fusion (LPBF), build components layer by layer using a metal powder feedstock and a focused energy source. Like WAAM, they offer significant design freedom and can produce complex geometries that are difficult to manufacture conventionally.

Where WAAM wins is with the production of large-scale metal components. WAAM can offer higher deposition rates, lower feedstock costs and larger build volumes. This makes it attractive for structural parts, pressure vessels, marine components and other applications where part size and manufacturing speed are important.

Where powder-based additive manufacturing wins is when manufacturers need to deliver finer feature resolution, tighter as-built tolerances and superior surface finishes. It’s often preferred for smaller, highly detailed components used in sectors such as aerospace, medical devices and precision engineering.

A WAAM print in progress, with a welding head emiting sparks over a metal cylinder.

Advantages of WAAM

WAAM offers several advantages over traditional manufacturing methods, particularly for large-scale, low-volume metal components. By reducing tooling requirements, improving material utilisation and enabling the production of complex geometries, it can provide a practical alternative to casting, forging and machining.

Advantage	Why it matters
Faster lead times	Eliminates tooling and can reduce manufacturing times for suitable applications. DEEP Manufacturing can reduce lead-time reductions of up to 3x compared with traditional routes.
Lower material waste	Near-net-shape manufacturing reduces unnecessary material removal
Large-scale production capability	DEEP Manufacturing's multi-robot systems can manufacture components up to 6.2m in diameter, 3.2m in height and 30 tonnes in mass.
Material availability	Uses widely available wire feedstock across carbon steels, stainless steels, copper alloys and nickel-based materials.
Design flexibility	Enables complex geometries, part consolidation and customised designs without dedicated moulds or dies.
Supply chain resilience	Reduces dependence on specialist castings, forgings and long procurement routes for critical components.
Certified manufacturing	WAAM is increasingly being adopted for safety-critical applications, supported by rigorous qualification, inspection and certification processes. DEEP Manufacturing holds DNV Approval of Manufacture for the additive manufacture of Pressure vessels for Human Occupancy (PVHOs).
Hybrid manufacturing	Can be combined with fabrication, machining and other manufacturing methods to optimise production routes and component performance.

Limitations of WAAM: When it’s not the best option

Like any manufacturing process, WAAM is not the right solution for every application. The most effective manufacturing route depends on factors such as production volume, part size, material and performance requirements.

Situation	Better alternative
High-volume production runs	Casting, forging or automated machining
Small, highly detailed components	Powder-bed metal additive manufacturing
Ultra-fine surface finishes straight from manufacture	Precision machining or grinding
Simple, low-cost commodity components	Traditional manufacturing methods
Applications requiring specific forged properties	Forging
Parts that already have mature, cost-effective supply chains	Existing manufacturing routes

Sustainability and environmental impact

WAAM can offer environmental benefits by improving material utilisation and reducing waste. Because components are built near-net-shape, less material is removed compared with machining from solid billet, which can be particularly beneficial for high-value metals.

Research has highlighted WAAM's high deposition rates and near-100% material efficiency compared with traditional subtractive manufacturing approaches. The sustainability benefits can be even greater where WAAM eliminates tooling, shortens supply chains, or enables the repair of existing components rather than full replacement.

As with any manufacturing process, the overall environmental impact depends on factors such as material selection, energy use, post-processing and transport.

Cost considerations: Is WAAM cheaper?

Cost comparisons between WAAM and traditional manufacturing are rarely straightforward. Rather than focusing solely on the manufacturing process itself, it is important to consider the wider project costs associated with producing a component.

For large, low-volume metal parts, WAAM can often deliver cost advantages by:

Eliminating moulds, patterns and forging dies
Reducing material waste through near-net-shape manufacturing
Shortening lead times and accelerating project delivery
Reducing dependence on specialist suppliers and long procurement routes
Consolidating multiple components into a single structure

Traditional manufacturing methods often remain the most economical choice for high-volume production. But for low-volume, customised or large-scale parts, WAAM can be a more cost-efficient manufacturing route by reducing tooling, material usage and delivery times.

Best industries and sectors for WAAM

WAAM is increasingly being adopted across industries where traditional manufacturing can create challenges around lead time or supply chain security.

Key sectors include:

Energy – Pressure-containing equipment, structural components and critical infrastructure. Learn more about WAAM for the energy sector.
Maritime – Marine propellers, pressure vessels, housings and fabricated structures. Explore WAAM for the maritime industry.
Aerospace – High-value components and applications where material efficiency is a priority. Discover WAAM for aerospace.
Defence – Mission-critical components requiring secure and resilient supply chains. Learn more about defence manufacturing.
Subsea – Pressure vessels, underwater infrastructure and safety-critical structures. Explore subsea WAAM manufacturing.

Quality, certification and inspection

For many applications, the key question is not whether WAAM can produce a component, but whether the process is repeatable, validated and certified for its intended use.

Mechanical properties such as yield strength, tensile strength and elongation must be understood and validated through process development, testing and inspection. At DEEP Manufacturing, this includes ongoing work in parameter optimisation, material characterisation and accelerated validation methods to support production readiness.

Quality is embedded throughout our manufacturing process, from material selection and process control to inspection, machining and final verification. DEEP Manufacturing has achieved DNV Approval of Manufacture for the use of WAAM to produce pressure vessels, pressure vessels for human occupancy, and hull structures and equipment. We also have ISO 9001 and ISO 45001 certifications, with Design and Development activities included within the ISO 9001 approval scope across both our Bristol and Houston facilities. We are also working towards API Q1 and API 20S requirements for additive manufacturing.

This combination of process control, testing and certification helps ensure that WAAM components can be manufactured with the consistency required for demanding applications across energy, maritime, defence, aerospace and subsea industries.

A golden metal 3D printed sector of a propeller blade, half machined and half as-printed

Complementing traditional manufacturing with WAAM

WAAM doesn’t need to be a replacement for casting, forging or machining. Each manufacturing route has strengths and applications where it delivers value.

For high-volume production, traditional manufacturing methods often remain the preferred choice. For large, complex or low-volume components, WAAM can offer significant advantages in lead time, material utilisation, design flexibility and supply chain resilience.

The most effective manufacturing route depends on the specific requirements of the component, including its size, geometry, material, performance requirements and production volume. Understanding these factors early in a project can help to improve manufacturing outcomes.

If you are evaluating manufacturing options for a metal component, DEEP Manufacturing can help assess the most appropriate route and identify where WAAM may provide an advantage.

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