Cause Analysis of the Weld Cracking of Angle Valve Seat in Wind Tunnel
Taking the simplified valve seat's assembly of high temperature and high pressure angle valve as the object of study,both finite element method and Goodman diagram were adopted to analyze both stress and fatigue life in the service process,including qualitatively analyzing the influence of valve seat's pre-stress on the performance of the valve and the cause of weld cracking.The results show that,the export weld's cracking is fatigue failure,and the temperature change mainly causes the weld cracking.The exis-tence of hot loading pre-stress has no effect on the overall stress distribution of the valve,but it causes the average stress amplitude of the inlet weld to increase,and reduces the fatigue life of the weld.The outlet weld with U-shaped groove can improve its fatigue life.
angle valvefinite element analysisfatigue lifeweldGoodman diagram
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