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A52 / Article

Using LMD Test Walls to Evaluate New Metal Powders Before Component Trials

LMD test walls are a practical powder-development screen: they create deposited material for processability review and later testing before a team commits to a full component trial.

Poster frame from a Laser Metal Deposition powder-wall build video

Answer at the top

One-sentence buyer answer.

LMD test walls are a practical powder-development screen: they create deposited material for processability review and later testing before a team commits to a full component trial.

Use it when

When to use it.

The page is being used to clarify inspection, documentation or release logic for LMD, repair or cladding.
The risk sits less in geometry and more in how evidence is established.
The reader needs to understand what monitoring, metallography or NDT can actually prove.

Avoid it when

When not to use it.

A visual check or dashboard is being used to replace real release logic.
A blanket quality promise is expected with no part-specific context.
Acceptance criteria stay undefined even though the request is already concrete.

Decision table

What usually decides the route.

Decision table with decision point, good sign and escalation signal.
Decision point	Good sign	Escalate or avoid
Inspection target	Dimensions, bond quality, surface state or microstructure are clearly named.	Quality is only described as generally 'good'.
Method	NDT, cross-sections, measurement or documentation match the risk.	There is no link between risk and method.
Monitoring	Monitoring supports process understanding or review logic.	Monitoring is expected to replace release on its own.
Acceptance	Release criteria are defined before the work starts.	Acceptance is only discussed after the result exists.

Readable summary:

This route fits when Dimensions, bond quality, surface state or microstructure are clearly named.
Escalate when Quality is only described as generally 'good'.

Industrial example

Public proof with similar logic.

CS15 - Duisburg Bridge Components with LMD: 750 kg+ Nodes and Handrails from CAD to Validated Production

Exafuse manufactured more than 750 kg of metal components for a pedestrian bridge project in Duisburg using Laser Metal Deposition (LMD). The scope included structural nodes, also described as Knoten, and handrail components. This is the...

Open related case study

Material and quality

What has to travel with the decision.

Material

The material route, substrate and heat effects define what inspection actually makes sense.
Microstructure or cross-section claims have to match the real application.

Quality

Set acceptance criteria, documentation and responsibilities before the work begins.
Read monitoring, NDT and destructive methods as complementary, not as substitutes.

Inspection and validation

Checklist before request or release.

Critical features and release criteria
Suitable measurement or NDT methods
Cross-sections or metallography where needed
Documentation format
Decision owner for deviations and release

New metal powders are not proven by chemistry alone. A powder can look strong on a datasheet and still behave poorly in a laser process. Flowability, melt-pool stability, oxidation behavior, cracking sensitivity, dilution, build height and surface quality all have to be tested under real deposition conditions.

The short answer

Exafuse can use LMD test walls as a practical screening step for new or modified metal powders. The goal is not to produce a final part. The goal is to create controlled deposited material that can be compared, sectioned, measured and tested.

Public video context

The video shows LMD wall building from metal powder candidates in a public powder-development context connected to Outokumpu. The article focuses on capability and does not publish exact powder names, alloy recipes, parameter windows, customer requirements or test results.

Why test walls are useful

An LMD wall is a compact test geometry. It is simple enough to build quickly, but useful enough to reveal process behavior before a team commits to a complex component trial.

Does the powder feed consistently?
Is the melt pool stable enough for the next development step?
Does the track build with predictable height and width?
Is the deposited wall continuous enough for later samples?
Are there visible signs of cracking, overheating, oxidation or poor wetting?
Is there enough material to cut, polish and test?

What wall builds can support later

The exact test plan depends on the powder and target application, but LMD wall builds can create deposited material for hardness testing, metallographic cross sections, SEM/EDX analysis, porosity review, dilution review, machining trials, batch comparison and parameter refinement.

What a powder developer can evaluate

For a material team, the wall is a bridge between powder production and full application trials. It shows processability before a complex part is built, creates comparable deposits and supports faster learning cycles when a powder does not feed well, cracks easily or produces unstable geometry.

Why LMD fits this screening role

LMD adds material locally from powder, so different powders can be screened without designing a final component. The process can expose powder feeding, melting, layering and wall-building behavior in a way that is directly relevant to later coating, repair, cladding or additive manufacturing trials.

What not to overread

A successful test wall does not automatically qualify a powder for every part. Before production use, the team still needs to consider target application, substrate compatibility, mechanical requirements, corrosion or wear requirements, post-processing, repeatability across batches, inspection and whether wall behavior transfers to the final geometry.

What to send for a similar powder trial

Powder type or material family.
Target application or reason for the powder development.
Available powder quantity and basic powder data if available.
Intended substrate material.
Target tests after deposition, such as hardness, microscopy, corrosion or wear screening.
Whether the output should be a wall, bead-on-plate sample, coating coupon or geometry-specific trial.
Confidentiality limits for photos, video and partner names.

Recommended next steps

Use the metal AM service page, materials overview, LMD process guide, alloy-selection article, melt-pool monitoring article and contact route when planning a powder-development screening route.

Buyer questions

Exact buyer questions that usually lead here.

What can monitoring actually prove?

Monitoring can make process behavior visible, but it does not replace a full release route without the right inspection behind it.

What inspection should be written into the request?

The method should follow from functional surfaces, risk, the material route and the internal release logic.

When is metallography worth it?

Especially when bond quality, microstructure or layer build-up are central to the technical decision.

Which alloy families can be relevant for Exafuse projects?

A practical starting point is Fe-, Ni-, Co-, copper and specialty steel discussions, with grade choice confirmed case by case.

Recommended next steps

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Related proof and guides

PageMetal AM: LMD & SLM Case studyCS15: Duisburg Bridge Components with LMD: 750 kg+ Nodes and Handrails from CAD to Validated Production Case studyCS13: 130 mm Bombenbohrer LMD Build-and-Coat Workflow: From Powder to Functional Drill FAQFAQ04: Materials and Alloys FAQ: Selecting Fe/Ni/Co Options for Wear and Corrosion ArticleA03: What Is Laser Metal Deposition (LMD) and When Should Industrial Buyers Use It?ArticleA13: Alloy Selection for Laser Cladding: Fe-, Ni-, and Co-Based Options and Tradeoffs

Recommended next steps

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Request a process-selection feasibility review

Send CAD, material, approximate size and target finish. Exafuse can review whether LMD, SLM or a hybrid route is the practical process path.

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EntityExafuse / ThinkIng - Additive Technology GmbH

TopicA52: Using LMD Test Walls to Evaluate New Metal Powders Before Component Trials

Primary questionHow do LMD test walls help evaluate new metal powders before component trials?

Suitable whenThe page is being used to clarify inspection, documentation or release logic for LMD, repair or cladding. / The risk sits less in geometry and more in how evidence is established.

Not suitable whenA visual check or dashboard is being used to replace real release logic. / A blanket quality promise is expected with no part-specific context.

Required input dataCritical features and release criteria, Suitable measurement or NDT methods, Cross-sections or metallography where needed, Documentation format

Relevant service pageMetal AM: LMD & SLM

Relevant toolCompare LMD, SLM or hybrid, Screen base cost drivers, Find the right route

Relevant proof / case studyCS15: Duisburg Bridge Components with LMD: 750 kg+ Nodes and Handrails from CAD to Validated Production

Contact routeFeasibility request

Claim boundaryPublic technical orientation, not final engineering approval.

Author / review

Technical responsibility on this page.

Expert review

Research and development

Manish connects research and development topics with public technical explanations. His focus is LMD process understanding, monitoring, AI-assisted process control, image processing and practical tools that help buyers prepare better technical requests.

LMD process development
Monitoring and AI
Technical tools and content

Process, material and release-relevant statements are handled conservatively at Exafuse and remain tied to the specific part context.

Final CTA

Move from reading to technical review.

Start with the key project facts: goal, part, material, damage or protection zone, finishing, inspection and timing.

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