When the horseshoe flame glass furnace was constructed, the expansion joint was too large. After firing the furnace, the expansion joint did not completely seal with the silica bricks, allowing the fire from the melting pool to penetrate into the small material pool. This caused low-melting materials in the fire wall to burn into the glass melt, resulting in numerous black 'bumps' on the surface of the glass plates, severely impacting glass quality. Our company's ceramic welding technology was employed to weld the expansion joint of the fire wall, compacting it and effectively resolving the issue.