The float glass production line, which has been in service for nine years, shows local deformation in the gaps between the 1# to 5# ports on the south and north sides of the large arch of the melting furnace due to furnace design and temperature changes. This has resulted in varying degrees of erosion and significant melting loss. An irregular triangular defect, approximately 80mm to 100mm wide and angled between 45° to 60°, has formed along the arc length of the inclined arch. This has caused local temperatures in the furnace to rise excessively, leading to the phenomenon of cross-firing and burning of the furnace arch ballast beam. This poses a serious threat to the structural safety of the furnace.Our company's ceramic welding technology is utilized to tightly weld the cross-fire area, effectively extending the service life of the furnace