How to weld stainless steel mirror panels?

When welding stainless steel mirror panels, several factors must be carefully managed to maintain precision, prevent defects, and ensure a high-quality finish. Below are the most common issues and their solutions.

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1. Size Control and Preparation

To prevent dimensional changes or miscalculations during installation, mirror stainless steel plates are often cut slightly larger. However, this can lead to slight centerline offsets in width, length, and thickness during welding. To address this:

Ensure precise cutting of components, maintaining a maximum length error of ±1mm.

Check the flatness of the panels before cutting. If the panel is not level, re-level it to prevent misalignment during welding.

2. Preventing Cracks and Welding Defects

Cracks are a common issue in welding stainless steel mirror panels. To minimize this risk:

Carefully control welding parameters and procedures to prevent excessive heat buildup.

Avoid using high current or abrupt flame shutoff, which can cause weld scars and surface defects.

Ensure weld joints are connected with an overlap of 10–15mm for better bonding.

Secure the components firmly in place before welding, ensuring strong and complete welding points.

Maintain a uniform weld wave on the weld surface, avoiding defects such as cracks, slag, burn-through, arc scratches, pits, or pinholes, which could weaken the weld and compromise aesthetics.

3. Handling Surface Imperfections

After grinding to remove oxidation, pinholes or pores may appear on the surface of the stainless steel mirror panel. To prevent this:

Thoroughly clean pinholes and pores before welding.

Adjust the welding current to reduce speed, ensuring uniform and consistent welding.

After welding and assembly, use manual grinding and polishing to restore the smooth, reflective surface of the panel.

By following these precautions, you can achieve a flawless, high-strength weld while maintaining the aesthetic appeal of stainless steel mirror panels.