Analysis of influence parameters on residual stress in glasstometal vacuum brazing flat joint

Because of unreasonable design,high residual stress exists in the glass-to-metal welding joint which results in the joint strength being weakened seriously.The finite element method of a sequentially coupling temperature field and welding residual field was used to simulate the vacuum brazing process of the glass and metal plate,the effects of the thickness of glass,metal and brazing filler metal,the brazing pressure and the brazing temperature on residual stress in the stress concentration area were analyzed,and the fracture morphological features of the welding joint were also observed through the tensile test.The results showed that the residual stress was increased with the increase of the thickness of metal,the thickness of metal had the greatest impact on the residual stress,the residual stress was reduced with the increase of brazing pressure and brazing temperature;the thickness of glass and brazing filler metal had little effect on the residual stress;the fracture area of the welding joint occured on the glass-to-metal interface which was close to the glass side.