In the non‑standard sheet metal fabrication industry, product quality stability often takes precedence over price in the eyes of customers. A bracket that exceeds dimensional tolerances can render an entire piece of equipment unassembleable; a single weld seam left incomplete may pose safety risks at the customer’s site. To address these concerns, our company has established a comprehensive, end‑to‑end quality management system—covering incoming materials, in‑process control, and finished products—based on the five key factors of People, Machines, Materials, Methods, and Environment. This ensures that every sheet metal component leaving our facility meets the design specifications and maintains full traceability.

Source Control: Incoming Material Inspection and Material Sampling Tests

All purchased steel plates, galvanized sheets, and stainless steel sheets must pass through three inspection stages before being accepted into the warehouse: Material Bill of Materials Verification (Require the supplier to provide a certificate of material authenticity from the original manufacturer.) Thickness sampling inspection (Use an ultrasonic thickness gauge; batches with tolerances exceeding ±0.05 mm shall be rejected.) Visual inspection (Rust, scratches, oil stains, etc.) For orders with special corrosion‑resistance requirements—such as outdoor cabinets—we also conduct random salt‑spray tests to eliminate material‑related risks at the source.

Process Control: First-Unit Inspection and In-Process Monitoring

Non-standard sheet metal parts are characterized by the fact that each production batch may have entirely different drawings; therefore, “first‑article inspection” is the most critical step in our quality management system.

Laser cutting process After the first piece is cut, the quality inspector uses a vernier caliper and a height gauge to measure critical contour dimensions and hole locations, and verifies against the CAD model to ensure there are no missed cuts or overheating.

Bending process After bending the first piece, use an angle protractor and a universal testing machine to verify the bend angle, dimensional accuracy, and springback. Adjust the press brake’s compensation settings until the results meet specifications before proceeding to mass production. Retain either the physical part or a photograph of the first piece from each batch.

Welding process : Perform visual inspection and leak testing on the first weld pass (for sealed enclosures, use kerosene penetration or air‑tightness testing). Once it is confirmed that there are no porosity, slag inclusions, or lack of fusion, document the welding parameters.

Grinding and Surface Treatment : After the first piece is confirmed, verify its surface roughness and chamfer radius to prevent sharp edges from causing injury.

In addition, each process is subject to inspections every two hours, with a particular focus on monitoring equipment stability and adherence to operating procedures. Any issues detected prompt immediate shutdown and adjustment, followed by traceability and root-cause analysis of the affected production batch.

Finished-product inspection: A combination of 100% inspection and sampling, with a test report issued.

To meet the diverse needs of our customers, our company offers two levels of finished-product inspection:

Regular order : Critical dimensions (mounting hole spacing, flatness, and perpendicularity) undergo 100% full inspection; non‑critical dimensions are subject to random sampling in accordance with the AQL sampling standards. A Dimension Inspection Record is provided with each shipment.

High-precision orders (tolerance within ±0.1 mm) All dimensions are subject to 100% inspection, with re‑verification performed using a CMM or projector, and both a First‑Article Inspection Report and a Batch Inspection Report are issued.

All finished products must also undergo… before packaging. Visual full inspection (Scratches, color variations, weld spatter, burrs, etc.) and Trial Assembly Random Inspection (Simulate customer installation to verify that hole positions are aligned and there is no interference.)

Traceability System: One product, one code; full-process traceability.

We generate a unique number for each batch order. Production traceability number and is reflected on the Process Flow Card and the final product’s label. Using the traceability number, it is possible to retrieve:

Steel grade, heat number, and supplier

Operators and inspectors for each process step

Equipment parameters (such as bending pressure, laser power)

Color codes and curing temperature profiles for surface treatment

This system not only facilitates internal quality improvement but also provides customers with significant peace of mind—should a quality issue arise at the end user, we can swiftly identify the root cause and implement corrective measures.

Continuous Improvement: Weekly Quality Meetings and Closed-Loop Handling of Customer Complaints

Our company holds a weekly quality review meeting to consolidate this week’s inspection data, scrap statistics, and customer feedback; analyze the top three defect categories; and develop improvement initiatives (e.g., “reduce the defect rate associated with springback in stainless steel bending”). For customer complaints, we commit to responding within 4 hours, providing interim corrective actions within 24 hours, completing root cause analysis and implementing permanent corrective measures within one week, and preparing an 8D report for submission to the customer.

Customer Testimonial: High-Quality Sheet Metal Starts with Rigorous Inspection

Over the years, thanks to our consistent quality, we have earned the long-term trust of customers in sectors such as electrical appliances, automation equipment, and new‑energy charging infrastructure. We firmly believe that every ounce of trust stems from an unwavering commitment to quality. Looking ahead, our company will continue to ramp up investment in testing equipment—planning to introduce an online visual inspection system—to make quality control more intelligent and data‑driven.

If you have high requirements for the precision and consistency of sheet metal parts, we welcome you to submit your drawings for a trial order. We confidently guarantee: if the dimensions do not meet specifications, we will remake the parts unconditionally.