From Galvanized sheet to Finished Box: Real Photos of the Sheet metal Workshop of Ouyue Electric, revealing the assembly process of Stainless steel distribution Box before spraying

I. The box body and door panel are manufactured separately: The precise logic behind the spraying process

In the first real photo, dozens of galvanized sheet boxes are neatly stacked and placed, waiting to enter the next process - electrostatic powder coating. After each box body undergoes laser cutting, CNC bending and robot welding, the surface still retains the original metallic luster of galvanized sheet. The weld seams are uniform and full, and the bent corners are neat without burrs.

The second picture shows the Door panels that match this batch of boxes, which are also neatly stacked, waiting for assembly after the box spraying is completed.

Why are the box body and the door panel manufactured and sprayed separately instead of being welded together and treated uniformly? Behind this lies Ouyue Electric's strict requirements for the final quality of its products:

Uniformity of spraying: The box body and the door panel are sprayed separately to ensure that the powder covers every corner, avoiding missed spraying or powder accumulation at the door panel hinge and the edge of the door gap due to obstruction.

Color consistency: The box bodies and door panels of the same batch enter the spraying line simultaneously to ensure that the final products have exactly the same color without any color difference.

Hinge precision protection: If the box body and the door panel are assembled before spraying, the high-temperature curing process may cause slight deformation at the hinge position. If the spraying is separated and then mixed later, this problem can be completely avoided.

II. Galvanized sheet material: A cost-effective anti-corrosion solution for iron distribution boxes

This batch of boxes is made of galvanized sheet as the base material and is a cost-effective iron distribution box solution launched by Ouyue Electric for indoor and general outdoor scenarios. The surface of the galvanized sheet already has a zinc layer as the basic anti-rust protection. After electrostatic powder spraying, a dual protection system of "zinc layer + powder coating" can be formed:

This "galvanized sheet + spray coating" solution is much cheaper than stainless steel distribution boxes, but it can still provide a service life of 5 to 10 years in indoor environments or outdoor scenarios with light corrosion. It is a cost-effective choice for small and medium-sized projects, building power distribution, industrial plants and other fields.

III. From semi-finished products to finished products: Quality control in four key processes

These two real photos capture a key node in the manufacturing process of the box - before spraying. The complete product delivery still needs to go through the following procedures:

Process One: Surface pretreatment

Before the box body and door panel enter the spraying line, they first undergo three pretreatment processes: degreasing, water washing and phosphating to remove surface oil stains and oxide layers, providing a clean and moderately rough adhesion surface for powder coatings.

Process Two: Electrostatic powder coating

Imported automatic spray guns are adopted. The powder is electrostatically adsorbed on the surface of the box under high voltage, evenly covering all planes and corners. The film thickness should be strictly controlled between 60 and 90μm. If it is too thick, it is prone to cracking; if it is too thin, the protection will be insufficient.

Process Three: High-temperature curing

After spraying, it enters a 200°C constant-temperature drying tunnel, where the powder melts, flows level and cross-links to cure, forming a dense and strong coating.

Process Four: Assembly and Full Inspection

After the box body and the door panel are respectively sprayed, they are assembled on the assembly line - installing hinges, embedding sealing strips, adjusting door locks, and pasting nameplates. The quality inspector checks each door panel one by one to ensure smooth opening and closing, whether the sealing strips fit properly, and whether there are orange peels or particles on the coating, to guarantee that each product meets the shipping standards.

IV. Factory real shooting: Responding to customers' quality concerns with real images

One of the most frequently asked questions by customers in B2B procurement is: "What guarantees your quality?"

These two pictures themselves are the answer: The neat stacking method reflects the factory's emphasis on surface protection of the products - protective spacers are placed between each layer of the box to prevent scratches caused by direct contact between steel plates. The regular flow rhythm (semi-finished products → spraying → assembly → quality inspection) supports Ouyue Electric's commitment of "sample production within 7 days after drawing confirmation" for rapid delivery.

As a source sheet metal factory, Ouyue Electric possesses the full-chain independent manufacturing capability from sheet metal cutting, bending and welding to spraying and assembly, and does not accept external quality control black boxes. We always welcome customers to visit our factory for on-site inspection and witness with their own eyes the entire process of your order from a pile of steel plates to the finished box.

V. Your order is in the next process of circulation in the workshop

Whether you need an economical and reliable galvanized sheet iron distribution box or a highly corrosion-resistant stainless steel distribution box, Ouyue Electric can provide one-stop customized services for your project with the quality and efficiency of the source factory.

It only takes 7 days to produce the finished product after the product drawings are confirmed. Welcome to send your technical requirements or box specifications. We will provide solution suggestions and sample scheduling as soon as possible. Your order might just be the next batch circulating in the workshop.