Repair Method for Detached Welding at the Bottom of Office Chair

The detached welding at the bottom of an office chair can be repaired using the following methods:

I. Basic Repair Plan (Welding-Based)

1. Cleaning and Polishing

   • Remove debris and dust from the bottom of the chair and the area with detached welding to ensure the welding surface is free of oil stains or rust.
   • Use sandpaper or an angle grinder to polish the surface of the detached welding area flat, removing the oxide layer and residual welding slag to provide a good contact surface for subsequent welding.

2. Welding Operation

   • If the chair is made of zinc alloy, heat the detached welding area to an appropriate temperature (usually 200-300℃, adjusted according to the material) before welding to avoid material embrittlement caused by direct welding.
   • Use a welding wire that matches the chair material (such as zinc alloy welding wire) for welding, ensuring uniform welds without pores. After welding, polish the welding area again to make its surface flat and smooth, preventing burrs from scratching the user or the floor.

3. Reinforcement

   • To prevent re-detachment of the welding, add support structures at the welding area. For example, use metal sheets (such as stainless steel sheets) or steel bars as reinforcements, and fix them around the detached welding area through welding or bolts to enhance the chair's load-bearing capacity and structural stability.

II. Temporary Emergency Plan (Adhesive-Assisted)

1. Quick Fixing

   • If welding cannot be done immediately, first clean the welding slag at the joint with an angle grinder, and then apply epoxy resin adhesive (such as AB glue) to temporarily fix the detached welding area. Epoxy resin adhesive has high bonding strength, but note that its high-temperature resistance is poor, and it may fail under long-term load-bearing.
   • If only decorative parts (such as plastic or metal trim strips) are detached, they can be directly glued with adhesive (such as strong quick-drying glue), and two stainless steel clamps can be additionally installed as double insurance to further fix the decorative parts.

2. Usage Restrictions

   • Static Curing After Adhesive Repair: Regardless of the type of adhesive used, avoid sitting on or shaking the chair for 24 hours after repair to ensure complete curing of the adhesive.
   • Insufficient Long-Term Stability: The strength of adhesive repair is much lower than that of welding, and it is only suitable for temporary emergency or light-load scenarios (such as fixing decorative parts). It is not recommended for repairing the main structure of the chair.

III. Precautions

• Prioritize Welding Repair: Welding can restore the original structural strength of the chair, especially suitable for detached welding problems in load-bearing parts (such as chair legs and five-star bases).
• Seek Professional Help: If you lack welding tools or experience, it is recommended to contact furniture repair personnel to handle it to avoid chair damage or safety hazards caused by improper operation.
• Regular Inspection and Maintenance: After repair, regularly inspect the welding area at the bottom of the chair, and promptly handle any looseness or cracks to extend the chair's service life.