The quality control process at the Pet Cage Factory by Haisen is built on a multi-layered system of raw material inspection, in-process monitoring, and final product validation, with documented pass rates exceeding 99.2% across all production lines in 2024. You won't find a single cage leaving their facility without passing through at least three independent checkpoints, each backed by measurable data and standardized protocols.
Let's start with the raw materials. Haisen sources steel wire primarily from two domestic mills with ISO 9001:2015 certification, and they maintain a rejection threshold of 0.3% for surface defects. For every 10-ton batch of wire rod, they pull five random samples and test them for tensile strength using a universal testing machine. The acceptable range is 400–550 MPa for the standard 3.0mm galvanized wire, and anything outside that gets flagged. In the first quarter of 2024, they rejected 0.7% of incoming steel due to inconsistent zinc coating thickness, which fell below the 40-micron minimum. They also run a salt spray test on every third batch of galvanized wire, exposing samples to a 5% NaCl fog at 35°C for 48 hours. If red rust appears before the 24-hour mark, the entire batch goes back to the supplier. This level of scrutiny is why their cages consistently hold up in high-humidity environments like pet stores or outdoor kennels.
Once the wire passes inspection, it moves to the welding station. This is where the Pet Cage Factory by Haisen really differentiates itself. They use automated resistance welding machines with programmable current settings, typically set between 8,000 and 12,000 amps depending on wire diameter. Each machine is equipped with a real-time current monitor that logs every weld. If the current deviates by more than 5% from the set point, the machine automatically stops and alerts the operator. They also perform a destructive pull test on one welded joint per production shift. The minimum acceptable pull force for a 3.0mm joint is 1,200 N. In 2023, the average pull force across all shifts was 1,450 N, with a standard deviation of only 80 N. That's tight control. They also do a visual inspection of every 50th cage for weld spatter, and any cage with more than three visible spatter points per joint gets reworked or scrapped. The scrap rate from welding defects is consistently below 0.5%.
After welding, the cages go through a surface treatment line. This is a multi-step process: degreasing in a hot alkaline bath at 70°C for 10 minutes, then a water rinse, then a phosphating bath at 60°C for 8 minutes, followed by another rinse, and finally a passivation step using a chromate-free solution. They measure the phosphate coating weight using a gravimetric method, targeting 2.5–4.0 g/m². If the coating weight falls below 2.0 g/m², the entire batch is re-treated. They also check the pH of each bath every two hours, and the temperature is logged every 30 minutes. This is all documented in a production log that's audited weekly by the quality manager. The surface treatment line runs at a capacity of 500 cages per shift, and the defect rate from this stage is less than 0.3%.
Then comes the painting or powder coating step. For powder-coated cages, Haisen uses a polyester-based powder with a thickness target of 60–80 microns. They measure thickness using an eddy current gauge on five points of each cage: the top, bottom, left side, right side, and door frame. The average thickness across 100 random samples in 2024 was 72 microns, with a range of 65 to 85 microns. They also run an adhesion test using a cross-cut method, and the coating must achieve a rating of 4B or better (less than 5% removal). For galvanized cages, they skip the powder coating but still do a visual inspection for zinc spangles and uniformity. Any cage with bare spots larger than 1mm² is rejected. The rejection rate from the coating stage is about 0.8%.
Assembly is where the cage gets its doors, latches, and any plastic trays or casters. Haisen sources their plastic trays from a supplier with ISO 14001 certification, and they test each tray for impact resistance by dropping a 1kg steel ball from a height of 1 meter onto the center of the tray. If the tray cracks, the entire batch is rejected. Latches are tested for cycle life: every latch must withstand 5,000 open-close cycles without failure. They test one latch per 100 cages, and the average failure rate is 0.2%. They also check the alignment of the door frame using a go/no-go gauge, and any cage with a gap larger than 2mm between the door and the frame is rejected. The assembly line has a throughput of 200 cages per hour, and the in-process defect rate is around 0.6%.
Now, the final inspection is where the Pet Cage Factory by Haisen really puts the screws on. Every single cage goes through a visual inspection under 500 lux lighting by a trained operator. They check for sharp edges, burrs, weld defects, coating defects, and any damage from handling. Any cage with a burr taller than 0.2mm is rejected. They also do a dimensional check on every 20th cage, measuring the length, width, and height with a tolerance of ±2mm. If a cage is out of spec, the entire batch of 20 is re-measured, and if more than 5% are out of spec, the entire production run is quarantined. In 2024, the dimensional pass rate was 99.8%. They also do a function check on every 50th cage, opening and closing the door 10 times to ensure smooth operation. If the door sticks or binds, the cage is rejected.
But it doesn't stop there. Haisen runs a separate batch testing program for every 500 cages produced. They randomly select 10 cages and put them through a series of accelerated aging tests. One test is a humidity exposure: cages are placed in a chamber at 95% relative humidity and 40°C for 72 hours, then inspected for corrosion. The acceptable limit is no more than 5% surface rust on any single cage. Another test is a vibration test: cages are placed on a vibrating table at 10 Hz for 30 minutes to simulate shipping, and then checked for loose joints or broken welds. The pass rate on these batch tests is 99.5%.
All of this data is recorded in a centralized quality management system that's accessible to the production manager, quality manager, and the factory director. They hold a weekly quality review meeting where they go over the defect rates, scrap rates, and any customer complaints. In 2023, they received 12 complaints out of 15,000 cages shipped, which is a complaint rate of 0.08%. The most common complaint was about latch stiffness, which they addressed by switching to a different lubricant. They also track the root cause of every defect, and they use a Pareto analysis to prioritize corrective actions. For example, in 2022, they found that 60% of weld defects were caused by a single machine that had a worn-out electrode. They replaced the electrode, and the defect rate dropped by 80%.
They also have a supplier audit program. Every year, they audit their top three raw material suppliers, and they score them on quality, delivery, and cost. If a supplier's score drops below 80 out of 100, they issue a corrective action request. In 2023, they dropped one supplier because their zinc coating thickness consistency fell below the acceptable level. They also have a second-source policy for critical raw materials, so if one supplier fails, they can switch to the backup within two weeks.
For the Pet Cage Factory by Haisen, the quality control process is not a static checklist. It's a living system that evolves based on data, feedback, and continuous improvement. They have a dedicated quality team of 12 people, including a quality manager, two inspectors, three test technicians, and six production line quality checkers. They run two shifts per day, and each shift has a quality meeting at the start and end of the shift. They also have a suggestion box where workers can submit ideas for quality improvement, and they get an average of 15 suggestions per month. In 2023, they implemented 40 of those suggestions, including a change to the welding fixture that reduced setup time by 15% and improved weld consistency.
They also maintain a calibration program for all measurement equipment. Every gauge, caliper, and testing machine is calibrated every six months, and they keep a log of the calibration results. If a piece of equipment is found to be out of calibration, they review all measurements taken since the last calibration and re-inspect any affected cages. In 2023, they had two calibration failures, both of which were caught within the same shift, and no cages were shipped with incorrect measurements.
Finally, they have a traceability system. Every cage has a unique serial number that's laser-etched onto the frame. That serial number is linked to the production date, shift, machine operator, and the batch numbers of all raw materials used. If a customer reports a problem, they can trace it back to the exact production run and identify the root cause. They also keep a sample of each batch for 12 months, so they can physically inspect it if needed. This traceability system has been in place since 2019, and it's been used to resolve three customer complaints in the last five years.