Metal Produciton

Production Process and Quality Control Points for Common Metal Materials (Stainless Steel/Iron/Copper/Aluminum)

Overall Process Flow：

Step 1: Material Cutting and Forming

Process Description: The first round of forming is completed using various processes such as laser cutting, CNC cutting, stamping, and bending.

Different processing methods are selected for different structures. Large lamp bodies often use laser cutting to ensure precision. Small parts use CNC cutting to ensure high precision. For curved or arc-shaped structures, die bending is used.

 

Professional Quality Control Points:

  1. Dimensional accuracy tolerance controlled within ±0.1mm (hotel engineering level)
  2. No burrs or burn marks on the cut edges
  3. Consistent forming angles and straight bending lines
  4. Complex structures require pre-fabrication and assembly to ensure consistency in later assembly

 

Purpose/Importance: To ensure that there are no structural deviations in metal parts during subsequent welding and glass assembly.

Step 2: Welding

Process Description

Common processes: TIG welding, spot welding, silver soldering (copper parts), hydrogen flame welding (brass process). The processing method depends on the metal material and the complexity of the lamp structure.

Professional Quality Control Points:

  1. Full and uniform weld points, no weak welds or missing welds.
  2. No deformation, blackening, or burning of the metal material at the weld position.
  3. Secondary reinforcement welding is required for load-bearing structural parts.
  4. The weld seam should not be visible after grinding (invisible welding).
  5. Silver soldering is required for copper parts to ensure uniform weld color and higher corrosion resistance.

 

Purpose/Importance: To ensure the stability of the lamp structure, a weld-free appearance, and no cracking during long-term use.

Step 3: Grinding

Process Description:

Metal grinding is generally divided into five stages: coarse grinding → medium grinding → fine grinding → finishing → cleaning. Different metal materials correspond to different grinding methods and sandpaper grit requirements.

Professional Quality Control Points:

  1. Smooth surface without ripples or unevenness.
  2. Texture direction must be uniform; random textures are not allowed.
  3. Edges and corners must be rounded and smooth to the touch.
  4. Welded areas must be completely fused, without any dents or protrusions.

 

Purpose/Importance: To lay the foundation for the texture of the surface treatment, facilitating a perfect surface finish later.

Step 4: Surface Treatment

 (Common: Electroplating/Baking Paint/Powder Coating/Brushed/Mirror Finish)

① Electroplating (Electroplating / PVD)

Process Description: Stainless steel electroplating process: commonly uses PVD, offering a wide range of color options (more corrosion-resistant and wear-resistant), the most commonly used surface treatment method.

Quality Control Points:

  1. Must pass a 24–72 hour salt spray test (hotel engineering standard)
  2. Uniform coating thickness (no unevenness)
  3. No pinholes, bubbles, or black spots on the surface

② Wet Paint

Process Description: Wet paint is a surface treatment method commonly used for iron parts or special color requirements.

Quality Control Points:

  1. Uniform color, no drips or particles
  2. Adhesion test passed (tape test)
  3. Surface hardness meets standards (H–2H)

③ Powder Coating

Process Description: Powder coating is a more environmentally friendly surface treatment process with strong adhesion.

Quality Control Points:

  1. Uniform powder deposition
  2. No powder coating dead corners
  3. No orange peel texture on the surface

④ Brushed Finish

Process Description: A commonly used process for high-end projects to achieve a high-grade texture.

Quality Control Points

  1. Uniform texture direction
  2. Unbroken or irregular texture
  3. No deep scratches on the surface

⑤ Mirror Polishing

Process Description: Used for high-end hotel decorative light fixtures or stainless steel bases, achieving a mirror effect for a beautiful and elegant appearance.

Quality Control Points

  • Mirror-like surface, no ripples
  • No polishing dead corners
  • No visible polishing grains or pits

Step 5: Assembly

Office Info

  • +86 153 1770 3510
  • info@annolighting.com / april@annolighting.com
  • Jiangmen City,Guangdong Province,China

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