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《Science & Technology of Welding & Joining》2013,18(5):440-445
AbstractA method is reported with which heat affected zone (HAZ) cracks in a specific region of spot welded joints, made of advanced high strength steels, could be realised. The influence of HAZ cracks on the fatigue behaviour, which is the focus of the contribution, was studied by evaluating the stiffness characteristics as a function of the number of cycles N in comparison with crack-free specimens, i.e. by analysing HAZ and fatigue cracks on the specimen surface and the surface of fatigue fractures containing beach marks. It was found that the fatigue cracks are not initiated at the HAZ cracks. The number of cycles to failure Nf is not significantly reduced for specimens with HAZ cracks. Overall, the examinations did not reveal any influence of HAZ cracks on the fatigue strength of resistance spot welded joints. 相似文献
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Double edge notched tensile (DENT) tests were carried out to investigate the slow crack growth (SCG) behavior of PE80 welded joints.Efforts were made to acquire creep fracture parameters which can char... 相似文献
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Abstract High quality corrosion resistant Cr-Ni steels are used in many branches of industry. Constructors are faced with the problem of correctly dimensioning statically and dynamically loaded parts, but have little data available for dynamically loaded welded constructions of high alloy austenitic steels. To close this gap fatigue strength tests were carried out on three different steels and five different welded joints. 相似文献
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双相不锈钢焊接接头的耐腐蚀性能 总被引:11,自引:0,他引:11
根据母材临界点蚀温度(CPT)的试验结果,利用小试样的腐蚀实验方法研究了奥氏体-铁素体双相不锈钢焊接接头的耐点蚀性能.结果表明,手工电弧焊工艺过程对双相不锈钢材料的耐点蚀性能具有显著的影响,点蚀优先发生在焊缝金属或焊接热影响区中.双相不锈钢材料的耐点蚀性能与材料本身奥氏体和铁素体相比例有关.腐蚀试样的表面状态(粗糙程度)对母材金属的耐点蚀性能有明显的影响.表面越粗糙,耐点蚀性能越差,临界点蚀温度越低. 相似文献
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The results of investigations of the effect of the welding conditions of manual arc welding on the structure and mechanical properties of the welded joints in low-carbon, low-alloyed pipe steels of the K56 strength grade are presented. It is shown that in welding in different combinations of welding current and welding speed, the superheated zone of the heat-affected zone (HAZ) is characterized by the formation of ferrite and pearlite in the form of grains and Widmanstätten structure. The experiment planning method is used to determine the regression dependences of the hardness and impact toughness of the metal of the superheated zone on the controllable welding parameters. 相似文献
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