Quality Control
Quality Control
Defined standards, process control and documented testing support dependable transformer delivery.
Quality Management
Quality Management Overview
Quality Policy
We follow established standards and apply precise process control to deliver reliable power transformers.
Quality Objectives
100% outgoing inspection pass rate; 100% closure of customer quality issues; and continual reduction of defect occurrence.
Quality System Basis
ISO 9001 quality management system, applicable transformer standards, customer technical agreements and type-test requirements.
Control Process
Quality at Every Stage
Documented controls follow each project from supplier approval to final delivery.
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01IQC
Incoming Quality Control
Qualified suppliers and inspected materials enter production.
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02IPQC
In-Process Quality Control
Confirmed work standards and checks keep production on track.
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03FQC / OQC
Final and Outgoing Inspection
Finished products are inspected, tested and documented before release.
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04Closed Loop
Nonconformance Control
Issues are isolated, reviewed and verified before closure.
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05After Sales
Customer Quality Feedback
Field feedback supports corrective action and continual improvement.
Clear Responsibility
Quality Management Works Across Every Team
01Quality Department
Planning, inspection and testing.
Procurement Department
Supplier approval and incoming-material coordination.
Production Department
Process execution and in-station inspection.
R&D and Technical Department
Approved drawings and process requirements.
After-Sales Department
Field quality feedback.
Traceability and Improvement
Transformer Traceability
Material, process and test records create a clear quality record for every transformer.
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Material Traceability
Material batches are linked to each production order.
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Product Identity Records
Each transformer has a unique equipment number.
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Process Record Retention
Key inspection and test records are retained.
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Reverse Traceability
Records can be traced after delivery.
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Continuous Improvement
Quality reviews drive corrective action.
Certificates & Reports
Certificates & Reports
Certificate and report materials are available for qualified JOHNN products and projects.
