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Abstract
To explore the effect of welding speed on the micromorphology and mechanical properties of the laser-welded vacuum plate glazing joints, this paper introduced the research status of the laser welding vacuum glazing and then carried out the preparation for experimental materials. This paper also analyzed the microstructure, the cause of the pores, and the mechanical properties of the sealing layer. The results show that the smaller the welding speed is, the more fully the solder melts. When the welding speed is 80 mm/min, the sealing layer generates the large thermal stress due to excessive laser input energy, which results in many connected cracks in the sealing layer. The porosity of the sealing layer increases with the increase of the welding speed. The thickness of the interface reaction wetting layer decreases with the increase of the welding speed. The hardness, tensile strength, and shear strength of the sealing layer will increase first and then decrease with the increase of welding speed. These studies can provide the theoretical basis for laser sealing manufacturing of vacuum plate glazing.
Highlights
Laser welding has the characteristics of high energy density [1], small thermal deformation of welding, and high welding efficiency
As a new type of energy-saving transparent insulation material, vacuum plate glazing has the advantages of strong thermal insulation performance, excellent anticondensation, and sound insulation performance and has been applied in the fields of construction, vegetable greenhouse, solar energy application, refrigeration transportation, etc
Zhao et al [4] prepared porous metalbonded cubic boron nitride (CBN) grinding wheel with ideal porosity and excellent mechanical properties and studied its performance. e experimental results showed that the porous CBN grinding wheel can obtain higher material removal rate and lower surface hardness under the same conditions compared with the vitrified grinding wheel
Summary
Laser welding has the characteristics of high energy density [1], small thermal deformation of welding, and high welding efficiency. The vacuum plate glazing will produce pores of different degrees inside the sealing layer. E more or unevenly distributed pores, which tend to cause stress concentration, can reduce the vacuum tightness, mechanical properties, and service life of the plate glazing. Is paper will carry out in-depth analysis on the pore defects of vacuum plate glazing laser welding, study the influence of the welding speed on the micromorphology and mechanical properties, explain the cause of pores formation from the aspect of porosity, and improve the sealing reliability of the vacuum plate glazing. Taking the HGL-LCY300 Nd : YAG laser welding system as the test platform and laser welding technology as the approach, the effects of welding speed on the melting layer, pore distribution, interface reaction wetting layer, and mechanical properties of vacuum flat glazing are studied. E welding process parameters are optimized to determine the optimal set of process parameters
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