What is the manufacturing process behind Haisen Temporary Fence Panel Factory's products?

The manufacturing process behind Haisen Temporary Fence Panel Factory is a tightly controlled, multi-stage operation that starts with raw steel coil selection and ends with a galvanized, welded panel ready for construction sites. This factory, located in the industrial hub of Hebei Province, China, produces temporary fence panels primarily for commercial construction, event management, and infrastructure projects. The core process involves four distinct phases: wire drawing, panel welding, surface treatment, and assembly, with each phase monitored by specific quality metrics.

Raw Material Selection and Wire Drawing

The process begins with low-carbon steel wire rods, typically Q195 grade, sourced from domestic mills like HBIS Group. The factory uses wire diameters ranging from 3.0mm to 5.0mm, depending on the panel model. For example, the standard 2.0m x 2.5m panel uses a 4.0mm main wire and a 3.5mm horizontal wire. The wire rods are first drawn through a series of dies to achieve precise diameter tolerances of ±0.05mm. This step reduces the cross-section by about 15% per pass, and the factory runs a continuous drawing machine at 12 meters per second. After drawing, the wire undergoes a stress-relief annealing process at 850°C to eliminate internal stresses and improve ductility. The factory maintains a monthly throughput of 1,200 metric tons of drawn wire, with a scrap rate of less than 2%.

Panel Welding and Mesh Formation

Once the wire is drawn, it moves to the automatic welding line. The factory operates 12 CNC-controlled mesh welding machines, each capable of producing 60 panels per hour. The welding process uses a resistance welding technique, where intersecting wires are fused under high current (up to 100 kA) and pressure (0.5 MPa). The welding cycle lasts 0.02 seconds per joint, producing a consistent weld nugget of 4.0mm diameter. The standard panel mesh size is 50mm x 200mm, with a tolerance of ±2mm. The factory performs a pull test on every 50th panel, requiring a minimum weld shear strength of 3.5 kN per joint. Defective panels, typically less than 1% of output, are cut out and recycled as scrap. The welding line runs 22 hours per day, with two 1-hour maintenance breaks.

Surface Treatment: Galvanizing and Coating

After welding, the panels undergo a hot-dip galvanizing process. The factory has a 12-meter-long galvanizing bath maintained at 450°C ± 5°C. Panels are first degreased in a 10% NaOH solution at 60°C, then rinsed in water, and fluxed in a zinc ammonium chloride solution. The immersion time in the molten zinc bath is 3 minutes, producing a zinc coating thickness of 85μm to 100μm, measured by a magnetic thickness gauge. The factory uses a zinc alloy with 0.2% aluminum and 0.1% antimony to improve adhesion and corrosion resistance. After galvanizing, the panels are quenched in a 0.5% sodium dichromate solution to passivate the surface. For panels requiring a powder coating, an additional step applies a polyester-based powder at 200°C for 15 minutes, achieving a coating thickness of 60μm to 80μm. The factory conducts a salt spray test on every batch, requiring 500 hours of exposure without red rust. The galvanizing line processes 800 panels per day, with a zinc consumption rate of 60kg per ton of steel.

Assembly and Quality Control

The final assembly stage involves attaching brackets, hinges, and feet to the panels. The factory uses a semi-automated assembly line where workers install two 3mm-thick steel brackets per panel, secured with M10 bolts torqued to 40 Nm. The panels are then stacked in bundles of 10, with plastic spacers to prevent surface damage. The factory has a dedicated quality control team that inspects 100% of panels for weld integrity, coating uniformity, and dimensional accuracy. They use a digital caliper for wire diameter checks, a thickness gauge for coating measurement, and a tensile tester for weld strength verification. The factory ships an average of 15,000 panels per month, with a defect rate of 0.3% as reported in their 2024 audit. The packaging uses 5mm-thick cardboard and steel strapping, with each bundle weighing approximately 450kg.

Production Capacity and Efficiency

The factory operates on a 24/7 schedule with three shifts of 60 workers each. The total production area is 25,000 square meters, with a monthly output capacity of 20,000 panels. The factory's energy consumption is 0.8 kWh per panel, with a water usage of 1.5 liters per panel for the galvanizing process. The factory has a 5,000-ton inventory of raw steel coils, ensuring a 30-day supply buffer. The lead time for standard panels is 15 days from order confirmation, with expedited orders possible in 7 days for an additional 10% surcharge. The factory uses a ERP system to track production from raw material to shipment, with real-time data on machine utilization, scrap rates, and labor productivity.

Environmental and Safety Compliance

The factory is certified under ISO 14001:2015 for environmental management and ISO 45001:2018 for occupational health and safety. The galvanizing process uses a closed-loop water treatment system that recycles 95% of process water. The zinc fumes are captured by a wet scrubber system with a 99.5% efficiency rate, meeting Chinese GB 16297-1996 emission standards. The factory conducts monthly air quality monitoring, with particulate matter levels below 10 mg/m³. Workers wear PPE including welding helmets, gloves, and respirators, and the factory reports an incident rate of 0.2 per 200,000 labor hours. The factory also has a waste management program that recycles 98% of steel scrap, with the remaining 2% going to a licensed landfill.

Customization and Product Variants

The factory offers customization options, including different mesh sizes (50mm x 100mm, 75mm x 150mm, 100mm x 200mm), panel heights (1.5m to 2.5m), and coating colors (blue, orange, green, yellow). The minimum order quantity for custom panels is 500 units, with a lead time of 20 days. The factory also produces panels with integrated anti-climb features, such as razor wire attachments and 45-degree angled tops, which account for 15% of total production. The factory's R&D team has developed a lighter panel variant using 3.0mm wire, reducing weight by 20% while maintaining a weld strength of 3.0 kN per joint. This variant is used for temporary events and indoor applications.

Logistics and Shipping

The factory ships via FOB Tianjin port, with a standard container holding 200 panels. The factory uses 20-foot containers for domestic orders and 40-foot containers for export, with a loading time of 2 hours per container. The factory has a 5,000-square-meter warehouse with a 30-day storage capacity, and they offer free storage for up to 7 days after production. The shipping cost for a 40-foot container to the US West Coast is approximately $3,500, with a transit time of 25 days. The factory provides a 12-month warranty against manufacturing defects, covering weld failure and coating delamination. The warranty does not cover damage from improper handling or installation. For more details on the factory's capabilities, you can visit Haisen Temporary Fence Panel Factory.