Drawing & Requirement Review
Confirm drawing revision, material, thickness, tolerances, welding, finishing and acceptance requirements.
OUTPUT · Critical requirement listQUALITY CONTROL
Quality Control for Custom Metal Parts
From drawing review, incoming verification and first article inspection to process control, final inspection and shipment release, we manage critical dimensions, structure, finish and assembly requirements in defined stages.
CONTROL PATH
Four-stage Quality Control
From requirement review to shipment release, each stage has defined inspection priorities and outputs.
Incoming & First Article Verification
Verify material grade, specification and batch, then validate first-part dimensions and structure.
OUTPUT · Incoming and FAI recordsProcess & Special Inspection
Perform patrol and sampling checks, plus special inspection for welding and finishing when applicable.
OUTPUT · In-process recordsFinal Inspection & Shipment Release
Check dimensions, appearance, assembly, quantity, labeling and packaging before release.
OUTPUT · Final inspection and shipment filesInspection items and frequency are defined according to the drawing, tolerances, structural complexity and customer requirements.
01 · REQUIREMENT REVIEW
Drawing & Inspection Requirement Review
Before quotation and production, we identify requirements affecting fit, function, appearance and delivery, reducing the risk of revision, unit or structure misunderstandings entering batch production.
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Critical requirement marking
Critical dimensions, mating positions, cosmetic zones and special inspection requirements are marked as priorities for first article and in-process inspection.
Drawing revision & unitsMaterial grade & thickness
Critical dimensions & tolerancesHole & bending requirements
Weld locations & requirementsFinish & color
Assembly & functionRequired inspection documents
02 · INCOMING VERIFICATION
Incoming Material Inspection
Material information, basic dimensions and surface condition are checked and linked to the order and batch.
01
Material Grade & Specification
Verify material type, grade, sheet thickness, tube diameter, wall thickness and purchasing specification.
02
Material Documents
Review material certificates, supplier data or related batch files when required by the order.
03
Dimensions & Surface Condition
Check thickness, width, diameter, straightness, rust, scratches, deformation and other conditions.
04
Batch Identification & Traceability
Record the material batch, receiving information and order usage for later reference.
Material certificates or related batch documents are reviewed or provided only when required by the order and available.
03 · FIRST ARTICLE RELEASE
First Article Inspection & Batch Release
After the first part is completed, inspectors check critical dimensions, holes, bend angles, welded structure, surface condition and assembly relationships against the approved drawing. Stable batch production begins after the first article passes.
For projects requiring customer approval, first-part photos, dimensional records or physical samples can be provided as agreed.
Overall sizeHole diameter & spacingBend angleWeld positionAssembly fitAppearanceSurface finish
RESULTFAI record / dimensional record / agreed customer approval files
04 · PROCESS CONTROL
Process & Special Inspection
Control mechanisms are applied through critical operations to maintain dimensional, structural and cosmetic consistency.
Equipment & Process Setup
Confirm programs, dies, fixtures and critical process parameters before production.
Critical Dimension Sampling
Sample length, holes, angles, diameters and other critical dimensions during production.
Process Patrol Inspection
Check deformation, burrs, dents, scratches and process stability; stop and review when abnormalities occur.
Batch Consistency Check
Sample batch products to prevent ongoing dimensional or cosmetic drift.
WHEN APPLICABLE
Welding & Structural Inspection
- Weld position and weld size
- Weld appearance and continuity
- Post-weld distortion and overall structure
- Secure attachment of nuts, studs and connections
WHEN APPLICABLE
Surface Finish Inspection
- Color and gloss consistency
- Complete coverage
- Scratches, sagging, exposed substrate and bubbles
- Film thickness, adhesion or salt spray checks per order
WHEN APPLICABLE
Dimensional & Assembly Verification
- Critical dimensions and tolerances
- Hole spacing, position and mating fit
- Gauge, fixture or template checks
- Trial assembly and interference check
WHEN APPLICABLE
Packaging & Shipment Inspection
- Quantity, labels and shipping marks
- Scratch, rust and separation protection
- Packing method and transport protection
- Shipment files and photo records
BY ORDER REQUIREMENT
Functional & Load Verification
- Support, fastening or rotation check
- Basic load or pull verification
- Adjustment and stop-position checks
- Customer-specified use condition review
05 · FINAL INSPECTION & RELEASE
Final Inspection, Assembly & Packaging Release
Final product and shipment checks form one release stage, confirming product condition, quantity, identification and packaging against the order.
A
PRODUCT VERIFICATION
Final Product & Assembly Verification
Recheck size, holes, angles and critical tolerances against the approved drawing.
Verify installation and fit using mating parts, gauges, fixtures or trial assembly.
Check surfaces, edges, identification, quantity and product consistency.
B
SHIPMENT VERIFICATION
Packaging & Pre-shipment Inspection
Use separators, corner protection, film or rust prevention according to shape and finish.
Verify quantity, cartons, part number, order number and labels, plus packing and internal restraint.
Prepare packing lists, inspection records, material files or related documents as required.
NON-CONFORMITY & DOCUMENTATION
Non-conformity Control, Records & Traceability
Non-conforming parts are isolated and re-inspected after disposition; records are linked to the order, drawing and batch.
- 01Identify & isolate
- 02Record & analyze
- 03Define disposition
- 04Re-inspect & confirm
- 05Corrective action & record
KF
INSPECTION RECORDDimensional inspection record example
ITEMSPEC.RESULTSTATUS01±0.200.08PASS02Ø8.008.02PASS0390°90.1°PASS
Illustrative sample; not the standard document format for every order.AVAILABLE BY ORDER
Inspection Records & Batch Traceability
Incoming inspection recordFirst article inspection recordProcess patrol recordFinal inspection reportMaterial certificateSurface treatment filePacking & shipment recordThird-party test report
Relevant inspection documents can be provided according to the order and customer requirements; not every file is included as a standard order document.
REVIEW QUALITY REQUIREMENTS BEFORE QUOTATION
Send Us Your Drawing, Tolerances & Inspection Requirements
We will confirm feasible inspection items, frequency and required output documents before production.