Abstract
To explore the mechanism of the pore formation in the laser-welded vacuum plate glazing sealing layer, a vacuum plate glazing laser side sealing test was carried out. The influence of the pulse current, pulse duration time, pulse frequency and welding speed on the pores of the sealing layer was studied by means of scanning electron microscopy (SEM) and metallographic microscopy, and the cause of the pores is analyzed. The results show that the porosity decreases with the increase of the pulse current. When the pulse current is 160 A, the pores are the fewest and smallest, and the porosity is only 0.1%. The porosity of the sealing layer decreases first and then increases with the increase of the pulse duration time. The porosity decreases first and then increases with the increase of the pulse frequency. When the pulse frequency is 18 Hz, the porosity is the least, at only 0.08%. The porosity of the sealing layer increases with the increase of the welding speed. When the welding speed is 80, 90, 100 and 110 mm/min, the porosity is 0.02, 0.08, 0.63 and 0.89%, respectively. These studies can provide a theoretical basis for laser sealing manufacturing of vacuum plate glazing.
Highlights
Vacuum glazing has the characteristics of low heat transfer coefficient, a high dew resistance factor level, high sound insulation performance, long life and light structure
In 2014, Kim et al [4] studied the effect of process parameters on the bending strength and shape of glazing by using the gas torch for vacuum glazing edge sealing experiments, and measured the sealing strength of the edge of vacuum glazing using the Taguchi test method, and determined the error rate of the two by comparing the experimental value with the predicted value
The results show that the porosity decreases with the increase of the pulse current
Summary
Vacuum glazing has the characteristics of low heat transfer coefficient, a high dew resistance factor level, high sound insulation performance, long life and light structure. It has become an important energy-saving thermal insulation material, which has been widely used in construction, agriculture and other fields such as solar water heater, thermal insulation cabinet and so on [1]. In 2015, Menon, et al [5] developed a low temperature (below 200 ◦ C) composite Cerasolzer CS186 alloy (Sn (56%), Pb (39%), Zn (3%), Sb (1%), A1-Ti-Si-Cu (1%)) as the surrounding encapsulation material for vacuum glazing (lead-tin alloy edge-sealing), and three-layer vacuum glazing was sealed by ultrasonic welding technology
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