Quality Assurance
Quality is defined before production: every order is released against approved drawings, a bill of materials and acceptance criteria, with inspection records tied to the vehicle.
- control principles
- 4
- system stages
- 5
- quality gates
- 8
- inspection areas
- 8
Four controls behind every shipment
Approved baseline
Drawings, configuration, key components, technical requirements and acceptance criteria are agreed before the first plate is cut.
Eight quality gates
An order moves to the next stage only after the current gate is released. A gate that is not released holds the unit.
Traceable records
The vehicle number ties back to the drawing revision, component batches, inspection results and any nonconformance raised against it.
Inspection access
You, or an independent body you appoint, can witness or audit at control points agreed in the contract.
Insurance, as the outer layer
US$2.90 million
cover per vehicle
Converted from the policy amount of RMB 20 million at US$1 = RMB 6.9; approximate display only.
Quality is controlled through our manufacturing and inspection system. Insurance is an additional layer of commercial risk protection within the verified policy scope -- not a substitute for the controls above.
- Insurer
- Ping An Insurance
- Policy type
- Product liability
- Scope
- Every unit produced, not a sample
Validity dates, exclusions and claim conditions are stated on the policy itself. We send the current certificate for verification on request rather than summarising terms that change.
How the system works
Define requirements
Turn an application and a destination market into a written, approved definition of conforming.
Control activities
- Contract review
- Drawing freeze
- Quality plan
- Acceptance criteria
Prevent variation
Control the inputs and the process parameters that decide whether unit forty matches the sample.
Control activities
- Supplier approval
- First article inspection
- Critical-to-quality characteristics
- Process control plan
- Engineering change control
Verify conformity
Check at fixed points rather than once at the end, so a deviation is caught while it is still cheap to correct.
Control activities
- Eight quality gates
- In-process inspection
- Final vehicle inspection
Prove with records
An inspection with no record is not auditable. Each unit leaves with a dossier tied to its vehicle number.
Control activities
- Vehicle quality dossier
- Batch traceability
- Customer or third-party report
Resolve and improve
Contain, correct, find the cause, and change the control that let it through.
Control activities
- Nonconforming product control
- Root cause analysis
- Corrective and preventive action
- Manufacturing issue response
One order, one approved baseline
What you give us
- Intended application
- Destination market
- Rated load and operating conditions
- Trailer type and configuration
- Your own specifications
- Regulatory requirements
Contract and technical review
Engineering, production and quality read the order together and resolve anything ambiguous in writing before it becomes a baseline.
What production works to
- Approved drawing
- Frozen bill of materials
- Critical-to-quality characteristics
- Inspection and test plan
- Acceptance criteria
- Required quality documents
- Customer witness points
When sources disagree
- 1Mandatory regulations in the destination market, and the contract
- 2Drawings and specifications you have approved
- 3International or industry standards we have both agreed
- 4Our internal control standards
Eight quality gates, requirement to release
Release status
- Pass
- Hold
- Rework
- Reinspect and release
Contract review
What is controlled
Application, destination regulations, load, configuration and acceptance requirements.
Evidence produced
Contract review record
Design freeze
What is controlled
Drawings, bill of materials, key parameters and any technical change.
Evidence produced
Approved drawing and BOM
Incoming quality
What is controlled
Steel, axles, suspension, braking components and other bought-in parts.
Evidence produced
Incoming inspection record
First article approval
What is controlled
Dimensions, structure, configuration and function of the first unit built.
Evidence produced
First article report
Structure and welding
What is controlled
Frame dimensions, welding process and the welds designated critical.
Evidence produced
Welding and geometry record
Coating and assembly
What is controlled
Surface preparation, coating thickness, assembly and fastener control.
Evidence produced
Coating and assembly record
Final vehicle inspection
What is controlled
Braking, electrics, dimensions, function, finish and the document set.
Evidence produced
Final inspection report
Shipment release
What is controlled
Every nonconformance closed, documents complete, vehicle identity confirmed.
Evidence produced
Shipment release record
From approved sample to repeatable production
- 01
Golden sample and first article
The approved first unit's state, configuration, photographs and measurements are kept as the reference for the batch.
- 02
Critical characteristics
Characteristics that affect safety, interchangeability, assembly or function in service are identified and measured every time, not sampled.
- 03
Controlled process parameters
Fixtures, welding parameters, locating method, assembly torque and coating parameters are held under change control.
- 04
Engineering change control
If a material, supplier, component, drawing or process changes in a way that affects the product, it is reassessed and re-approved as agreed.
- 05
Batch verification
Through the run, the quality plan sets first-off checks, patrol inspection, sampling and final release.
What we inspect before shipment
| Area | Representative items | Method or equipment | Acceptance basis | Record kept |
|---|---|---|---|---|
| 01Structure and welds | Weld appearance and size, defects, designated critical joints | Weld gauge and visual inspection; MT or UT where required | Welding standard and the quality plan | Welding inspection record |
| 02Chassis geometry | Overall length, wheelbase, diagonals, frame level | Laser measurement, level, gauges | Drawing tolerances | Dimensional report |
| 03Coating and finish | Surface condition, film thickness, adhesion, appearance | Dry film thickness gauge, visual inspection | Coating specification | Coating report |
| 04Axles and suspension | Axle alignment, suspension, tyres, fasteners | ATD-GPS four-wheel alignment equipment and calibrated torque wrench | Drawing and supplier requirements | Alignment and torque record |
| 05Braking and pneumatics | Lines, full-circuit pressure hold, brake response and parking-brake release | Coupled to a tractor; pressure gauge, leak test and brake timing check | Destination regulations and the technical specification | Brake test record |
| 06Electrical and lighting | Lamps, harness, connectors, circuit function | Electrical test bench, multimeter, function test | Regulations and the wiring diagram | Electrical test record |
| 07VIN and documents | Model, configuration, VIN, component brands | Check against drawing and BOM, scan or number verification | Approved drawing and the order | Configuration checklist |
| 08Function and completeness | Landing legs, locks, hydraulics, accessories, documents | Function trial and checklist verification | Contract and operating requirements | Final inspection report |
Product-specific inspection plans
Flatbed and container chassis
- Twist-lock position and operation
- Platform geometry
- Load-bearing points
- Side and rear protection
- Container compatibility
Lowbed trailer
- Deck height and geometry
- Ramp operation
- Gooseneck and loading interface
- Axle alignment
- Ground-clearance dimensions
Tipper trailer
- Hydraulic circuit
- Cylinder mounting
- Rear-door locking
- Tipping function
- Safety support mechanism
Tank trailer
- Tank material and identification
- Compartment configuration
- Weld and leak inspection
- Compartment-by-compartment leak test, plus vacuum testing where the design requires it
- Hydrostatic testing to the applicable licensed pressure, with a record for each vessel
- Cargo-specific regulatory requirements
Tank trailers get a plan written for the specific medium and destination regulation. A general semi-trailer checklist is not a substitute.
A traceable quality dossier for every shipment
How a vehicle is traced
- Vehicle ID
- Order
- Drawing revision
- Bill of materials
- Component batch
- Inspection record
- Nonconformance and CAPA
- Shipment
What the dossier holds
- Approved drawings and specifications
- Bill of materials and configuration record
- Material or component certificates
- Incoming inspection records
- First article inspection report
- Welding and dimensional records
- Coating thickness report
- Torque, alignment, brake and electrical records
- Nonconformity closure records
- Final inspection report
- Operating and maintenance manual in the agreed language
- Axle, brake and suspension supplier documentation
- Assembly instructions and marked parts list for CKD or SKD shipments
- Shipment photo record
- VIN or serial number traceability
- Customer or third-party inspection report
A redacted dossier from a comparable build can be sent under NDA. Ask for it with your enquiry and name the trailer type.
Nonconformities are closed before release
- 1Identify
- 2Mark and segregate
- 3Assess
- 4Correct or rework
- 5Reinspect
- 6Root cause and CAPA
- 7Close
Three severity levels
Critical
Affects safety, regulatory compliance or a key function. Related production or release stops immediately.
Major
Affects function, assembly, durability or a contract requirement. Released only after correction and reinspection.
Minor
Does not affect safety or basic function, but is still dispositioned and recorded as agreed.
Every nonconformance record carries
- Vehicle or batch identification
- Defect description
- Responsible process
- Temporary containment
- Disposition decision
- Reinspection result
- Root cause
- Corrective and preventive action
- Closure approval
Inspection access at agreed control points
- Review point
- You review documents. Production continues.
- Witness point
- We notify you in advance so you or your inspector can attend. Non-attendance is handled as the contract says.
- Hold point
- Production or shipment does not continue until you release it in writing.
Ways to inspect
- Remote document review
- Video inspection
- On-site inspection by your team
- Inspection by an independent body you appoint
- Pre-shipment inspection
- Container loading supervision
Practical arrangements
- Visit preparation
- For an agreed plant visit, we can issue an invitation letter for the visa application and arrange access to the workshop and test bay.
- Independent reporting
- The independent body you appoint releases its report directly to you rather than routing it through us.
- Chassis-numbered evidence
- Requested tests can be filmed with the chassis number visible in shot, then delivered with the matching inspection records.
Traceable response when an issue is reported
- 01Receive the case
- 02Confirm vehicle identification
- 03Retrieve production and inspection records
- 04Assess scope and contain
- 05Root-cause analysis
- 06Agree the applicable remedy
- 07Close the case and update controls
Warranty, in outline
The summary covers when cover starts, what counts as a manufacturing defect, how responsibility is assessed, the main exclusions, and what a claim needs from you. The contract is what governs.
Warranty and after-sales termsQuestions buyers ask about quality
Can we appoint our own inspection company?
Yes. Name the independent body in the contract along with the control points it will attend, and whether each is a review, witness or hold point. We give notice before witness points and do not ship past a hold point without written release.
What documents come with the vehicle?
The dossier listed above, filed against the vehicle number. Which items are contractual deliverables depends on the destination market and what you specify, so it is worth fixing the list at contract review rather than at shipment.
How do you control changes after sample approval?
Through engineering change control. A change to material, supplier, component, drawing or process that affects the product is reassessed and re-approved as the contract requires before it reaches a production unit.
What happens if a manufacturing issue is found after delivery?
Send the vehicle number, photographs and the operating record. We retrieve that unit's production and inspection records, assess scope, run root-cause analysis and agree the remedy. Warranty terms themselves sit with after-sales.
Define your quality requirements before production
Tell us the destination country, trailer type, rated load, required standards and inspection points, plus your visit dates or appointed inspection body. We prepare the quality plan and inspection arrangements before anything is built.