3D Printing With Metal — WAAM, Layer Upon Layer
Wire arc additive manufacturing builds solid metal directly from a spool — layer on layer, each weld bead the foundation for the next.
The same clip as a vertical short
What you see
- Solid metal built directly from a wire spool, bead on bead.
- Each new layer deposited on the melt pool of the one before it.
- Heat accumulating across passes as the build grows.
- Why interpass temperature control keeps geometry and microstructure stable.
Monitor it with Therness
- HeatCam thermal sensors read layer and interpass temperature live.
- HeatCore AI flags overheating and process drift before a layer fails.
- Layer-by-layer thermal records build QA evidence for every part.
- Works on carbon steel, titanium, and nickel WAAM builds.
Why it prints solid metal
Framed as 3D printing, WAAM swaps a powder bed for a spool of welding wire and a moving arc, and that changes the economics: deposition is measured in kilograms per hour rather than grams, so large near-net-shape parts leave the machine with far less material cut away than from a forged billet. The trade-off is thermal. Every bead you watch land pumps energy into a workpiece that is already hot, and unmanaged heat build-up is what warps a tall wall or coarsens the grain in a titanium or nickel aerospace build. Travel speed, wire feed, and the dwell between layers are the levers; layer temperature is the feedback. Watching the deposition run at real scale is the clearest argument for grading each layer's heat as it forms, rather than inspecting only the finished — and by then unfixable — part.
The physics on screen
On screen the torch retraces the same path over and over, laying one bead directly on the crown of the last. In DED-Arc terms every pass is a fresh weld: the arc remelts the top of the previous layer so the two fuse metallurgically rather than merely stack. What decides whether that fusion is sound is heat balance. Early layers shed heat into a cold substrate and solidify fast; as the wall grows the base can no longer sink that energy, so the pool widens and a bead can slump or trap gas. Holding interpass temperature inside the procedure window is what keeps wall width, dilution, and microstructure repeatable from the first layer to the last — the value that a thermal camera reads without a contact thermocouple.
