Research on the Deformation Feature of Welded Zone in Hydroformed Bellows
CHEN Xiaohua1, ZHAO Changcai1, GUO Qingbo2, LI Jianchao1
1 Key Laboratory of Advanced Forging & Stamping Technology and Science of Ministry of Education of China,Yanshan University, Qinhuangdao 066004; 2 Qinhuangdao North Metal Hose CO.,LTD, Qinhuangdao 066004
Abstract: It is the prerequisite for analyzing bellows internal high pressure bulging to create the material and mechanical model precisely for welded tube including parent metal, heat affected zone and welded bead. In this study, the material model was created by a mixture material criterion based on the uniaxial tensile test and microhardness test of welded zone. The influence of internal pressure and die parameters on the deformation feature of tube was studied by the hydroforming test and numerical simulation. Microstructure analysis shows that the dendritic crystal in welded zone makes thickness difference between parent metal and welded zone after bulging, and martensite appeared after deformation can promote the formation of crack and induce the stress corrosion cracking of bellows in later use.
陈晓华, 赵长财, 国庆波, 李建超. 波纹管内高压成形焊接区变形特征研究*[J]. CLDB, 2017, 31(8): 140-144.
CHEN Xiaohua, ZHAO Changcai, GUO Qingbo, LI Jianchao. Research on the Deformation Feature of Welded Zone in Hydroformed Bellows. Materials Reports, 2017, 31(8): 140-144.
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2017, Vol. 31 
