Inhaltsverzeichnis
Able Hardware provides CNC machining and welding services from one factory in Suzhou, Jiangsu, China. We weld the fabrication, control how it moves, then machine the features to your drawing dimensions — mounting faces, Bohrungen, and hole patterns cut on the finished assembly rather than on parts that shift during welding. Schneiden, Schweißen, Bearbeitung, and finishing run in-house through our Kundenspezifisches Schweißen & Fertigungsdienstleistungen, so dimensional responsibility stays with one supplier.
CNC Machining for Welded Assemblies, Not Standalone CNC Parts
What This Service Covers
CNC machining for welded assemblies means finish-machining a weldment after joining: facing, langweilig, Bohren, reaming, and tapping the features that welding cannot hold. Work arrives either as our own weldment or as a build-to-print assembly welded to your drawing.
What This Page Does Not Cover
We are not quoting general job-shop CNC work on bar, billet, or castings. This capability exists to serve fabricated assemblies, so the workpiece is a weldment and the constraints are weld distortion, Zugang, and mass rather than cycle time on a single machined block.
CNC-Machined Weldments We Produce
Machined Welded Frames, Maschinenbasen, and Skids
Machining welded frames is our highest-volume application: coplanar mounting pads, rail seats, gearbox faces, and hole patterns cut after the frame is welded and settled — see Kundenspezifische geschweißte Rahmen.
Machined Welded Structures, Housings, and Equipment Subassemblies
Machining welded structures covers plate-and-tube weldments where bores, flange faces, and interfaces must relate to each other rather than to individual components. Multi-part Kundenspezifische Schweißbaugruppen ship under one part number.
Machined Brackets, Unterstützt, and Mounting Assemblies
Smaller CNC machined weldments — brackets, pillow-block supports, adjuster plates — usually need one accurate face, one bore, and a hole pattern in a known relationship, which is a setup problem rather than a machining problem.
Why Critical Features Are Machined After Welding
Weld Distortion, Residual Stress, and Dimensional Drift
Welding is localised heating and restrained contraction, so every joint leaves residual stress and moves the geometry around it. ISO 13920 is written for welded constructions and, across 400–1,000 mm, permits roughly ±3 mm at class B and ±6 mm at class C — orders of magnitude looser than the machined-fit tolerances typically applied to bearing seats and mounting interfaces.
When Post-Weld CNC Machining Is Required
Post-weld machining is justified when a feature is tighter than the weldment’s distortion budget, when several features share one datum framework, or when the interface mates with a purchased component. Applying ISO 2768 to a two-metre welded frame instead of ISO 13920 creates a dispute no fabricator can win; machining the specific features that need it resolves the drawing honestly.
| Feature intent | Realistic route |
|---|---|
| Strukturell, non-mating geometry | Weld to ISO 13920 Klasse, no machining |
| Bearing seat, rail face, gearbox pad | Weld with allowance, then finish machine |
| Hole pattern mating to a purchased unit | Drill and ream after welding, on the machined datum |
| Cosmetic flat panel | Fixture and sequence control, not machining |
When Intermediate Machining Between Weld Stages Is Used
Where a heavy weldment carries both structural welds and a tight interface, features can be roughed after primary welding, welded further, then finish-machined. This releases the bulk of the stress before the last cut, at the cost of an extra setup — a trade we quote rather than assume.
Post-Weld CNC Machining Capabilities
Facing, Milling, Boring, Bohren, Reaming, and Tapping
Typical scope on a weldment is face milling of mounting planes, boring and reaming of bearing or bushing seats, drilling and tapping of hole patterns, plus counterbores, Schlüssel, and pockets. Machining welded assemblies is dominated by milling operations because the features are planes, Bohrungen, and patterns rather than turned profiles.
Datum Setup, Fixturing, and Multi-Face Access
A weldment is less rigid than a solid billet, so clamping strategy decides whether the part is measured in the same state it is machined. We locate on a 3-2-1 scheme referenced to your drawing datums, support long spans against deflection, and clamp against fixed stops instead of pulling the structure into position — a frame forced flat under clamps will spring back after release.
Work Envelope, Assembly Weight, and Feature Access
Machine travels, table capacity, and crane access set the buildable envelope, not floor area. Send overall dimensions, assembly mass, and the location of every machined feature with your enquiry and we confirm the route before quoting.
Machined Features We Cut on Welded Parts
Mounting Faces, Pads, and Datum Surfaces
The most common request in CNC machining for welded parts is a set of coplanar pads that a motor, gearbox, linear rail, or cylinder mounts to. Machining them in one setup makes them coplanar by construction rather than by inspection.
Langeweile, Bearing Seats, and Alignment Features
Bores machined after welding hold their relationship to each other and to the mounting face. Line-boring two housings in a single setup controls coaxiality far more reliably than welding two pre-machined housings and hoping the fit-up survives.
Hole Patterns, Themen, Spielautomaten, and Pockets
Drilled, reamed, and tapped patterns cut from the machined datum give repeatable assembly across units. Where a pattern mates with a bought-in component, send that component drawing so position tolerance is allocated against the real interface.
Materials We Weld and Then Machine
Carbon Steel and Structural Steel Weldments
Q235B and Q355B cover most structural work, with A36 or S355 equivalence approved on the drawing rather than assumed. Carbon steel machines and welds predictably, and expands about 12 µm/m·K — on a 2 m weldment that is roughly 24 µm per °C, so heavy cuts should stabilise before final measurement.
Stainless Steel Weldments
Edelstahl dehnt sich aus 17 µm/m·K with roughly a third of carbon steel’s thermal conductivity, so it distorts more at identical welding parameters and needs more allowance on machined features — see Schweißdienstleistungen für Edelstahl.
Aluminum Weldments
Aluminum saves roughly 65% of mass at equal volume and machines quickly, but expands about 23 µm/m·K and softens in the heat-affected zone — 6061-T6 loses temper near the weld, which matters when a machined face sits close to a joint. Sehen Aluminiumschweißdienstleistungen.
Platte, Rohr, Beam, and Mixed-Stock Fabrications
Machined weldments commonly mix plate, RHS/SHS tube, Kanal, Winkel, and solid machined inserts. Where a tight bore or thread is needed in thin wall, a machined boss welded into the structure is usually cheaper and more reliable than machining the tube itself.
Production Sequence From Drawing to Machined Weldment
Drawing Review, Stock Allowance, and Datum Planning
Before cutting steel we identify which features will be machined, confirm the datum scheme is reachable in a sensible setup, and check that the fabricated components carry enough stock. Features flagged at this stage cost a phone call; the same features flagged after welding cost a rebuild.
Schneiden, Fit-Up, and Welding Before Finish Machining
Blanks are profiled through our Laserschneiddienstleistungen, because root gap variation drives weld volume, heat input, and therefore movement. Joining runs under our Kundenspezifische Metallschweißdienste with sequence and fixturing chosen to keep distortion inside the machining allowance.
Stress Relief and Straightening When Specified
Thermal stress relief of carbon steel is conventionally performed around 580–620 °C with soak time scaled to thickness, and is specified when a heavy or highly restrained weldment must stay stable after machining. It is a costed, drawing-driven operation, not a default step.
Finish Machining, Deburr, and Inspection Release
Finish machining runs against the planned datums, followed by deburring, Reinigung, dimensional verification, and documented release. Where coating follows, machined interfaces are masked or protected.
Toleranzen, Gd&T, and Machining Allowance
Which Features Belong on the Machined Datum Scheme
Put the datum framework on machined surfaces, not on as-welded edges. A drawing that references a machined bore back to a sawn tube end transfers fabrication scatter straight into a precision feature and makes the tolerance unachievable at any price.
Ebenheit, Position, Parallelität, and Perpendicularity
We work to ASME Y14.5 or ISO 1101 callouts as drawn. State whether flatness is verified free-state or restrained: the same weldment measured on a surface plate and measured clamped to a fixture returns different numbers, so the measurement condition belongs on the drawing alongside the tolerance.
How Much Stock to Leave for Precision Machining After Welding
Precision machining after welding only works if material remains where the cutter needs it. Allowance scales with span, section thickness, heat input, and material — a small bracket needs little, a long thin-walled frame needs considerably more, and stainless generally needs more than carbon steel at equal geometry. Send the assembly geometry and we return the allowance we intend to build in, per feature.
Inspektion, Dokumentation, and Acceptance
In-Process Checks and Final Dimensional Inspection
Fit-up and weld size are checked before machining, and allowance is verified before the finishing cut so a short feature is caught while it can still be corrected. Final inspection reports the machined features against the drawing datums.
CMM und GD&T Reporting When Specified
Where geometric tolerances apply, features are measured against declared datums and reported as numbers, kein Passstempel. Agree the measurement method with the tolerance — inspection scope is a costed line item, so name it at RFQ stage.
Traceability Packs Shipped With the Assembly
Documentation can include EN 10204 3.1 mill certificates, Konformitätsbescheinigungen, dimensional and first-article reports, and coating records — see Qualitätskontrolle for our approach to traceability and inspection records.
Prototyp, Low-Volume, und Wiederholungsproduktion
First-Article Machined Weldments
Prototype weldments are machined from layout and soft fixturing, which is slower per piece but proves the datum scheme, the allowance, and the assembly interfaces before tooling is committed.
Repeat OEM Geometry and Fixture Payback
Once geometry stabilises, a dedicated machining fixture removes setup time from every unit. Divide fixture cost by the minutes it saves per part and the break-even quantity answers itself — worth doing before assuming either route.
Abschluss, Schutz, and Export Packaging
Coating Sequence and Masking of Machined Surfaces
Coating usually follows machining, which means machined faces, Bohrungen, and threads must be masked or the film thickness allowed for in the fit. Powder coating adds measurable build-up on every coated surface, so a bore coated by accident is a bore out of tolerance — see Metalloberflächenbehandlung.
Corrosion Protection and Pack-Out for Machined Interfaces
Bare machined steel will corrode in transit, particularly on sea freight to North America or Australia. Machined interfaces are protected and packed so the faces you will bolt to arrive in the condition they left in.
Applications and Industries That Need Machined Weldments
Industrielle Maschinen, Automatisierung, and Equipment Foundations
Maschinenbasen, automation frames, Förderanlagen, and equipment foundations are judged on flatness and hole position, which is precisely the case for machining after welding — see Geschweißte Rahmen & Wagen für Industrieausrüstung.
Heavy Equipment, Material Handling, and OEM Structures
Heavier fabricated assemblies use post-weld machining to align bearings, pivots, and mounting interfaces across a large structure. Application-specific requirements are covered under Industry Solutions.
What to Send for a CNC Machining and Welding Quote
Zeichnungen, Modelle, and Critical Feature Callouts
Send a 2D drawing with a 3D model, and mark which features are machined, which datums they reference, and which interfaces mate with purchased components. Weld symbols to ISO 2553 or AWS A2.4 and a stated tolerance framework — ISO 13920 for the weldment, ISO 2768 or specific callouts for machined features — remove most quoting ambiguity.
Material, Menge, Beenden, Inspektion, and Destination
Confirm grade and section sizes, prototype and annual quantities, stress-relief requirements if any, surface finish and masking, inspection and documentation scope, plus destination port and packing requirements.
Request a Quote for CNC Machining & Schweißdienstleistungen
Send drawings or models with machined features identified, Materialien, Mengen, tolerance framework, beenden, and destination. Our engineers review datums, feature access, Bearbeitungszugabe, and weld sequence, raise questions before quoting, and return a costed proposal with manufacturability notes. Drawings are reviewed under NDA on request — contact Able Hardware to have your machined weldments quoted.
