The flat arch bricks of the 600T float glass production line at the factory had been in operation for four years but were frequently eroded by flames and affected by temperature gradients. This resulted in defects in the thermal shock stability of the bricks. Consequently, most of the flat arch zirconium corundum bricks (AZS33#) near the small furnace blasting port fell off, creating a defect approximately 1800mm long, 300mm wide, and 300mm deep. Flames from the furnace had already begun to emerge from the connection between the flat arch and the slope arch, and the arch ballast beam was red, severely compromising the structural safety of the glass melting furnace.

To address these issues, the company utilized ceramic welding combined with a high-temperature furnace periscope to conduct hot repairs on the flat arch bricks without disrupting production. The welded parts remained in safe operation for 25 months.