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Date of Publication:2013-01-01

Journal:压力容器

Issue:9

Page Number:31-38

ISSN No.:1001-4837

Abstract:The key problem of double -layer flat head structure is the leakage induced by the crack in the welding position between the panel and the nozzle .Welding residual stress is one of the main influential factors.In this work,numerical simulation on welding temperature field and thermal stress of double -lay-er flat head structure was carried out based on APDL of ANSYS software ,element birth and death technol-ogy and thermal -mechanical coupling method , and the distribution law of welding residual stress was found out .The simulation results indicate that the hoop stress is much larger at the welding zone , which easily induces the cracking and leakage sometimes .The compressive stress is very high near the welding zone ,and it is mainly caused by the expansion of heating welding material .The analysis from calculation results provides some theory references for evaluating and controlling the welding residual stress .It is of great significance for increasing the reliability and safety of double -layer flat head structure .

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