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From the viewpoint of welding mechanics, two new welding methods-welding with trailing peening and welding with trailing impactive rolling were introduced. For aluminum alloy thin-shell structures with high strength, welding will lead to hot cracking, poor joint and distortion. In order to solve them, trailing impactive device was used behind welding torch to impact the different positions of welded joints, thus realizing the welding with free-hot cracking, low distortion and join tstrengthening. By use of impactive rolling wheels instead of peening heads, the outlook of welded specimen can be improved and stress concentration at weld toes can be reduced. Equipment of this technology is simple and portable. It can used to weld sheets, longitudinal and ring-like beams of tube-like structures, as well as the thin-shell structures with closed welds such as flanges and hatches. So the technology has the wide application foreground in the fields of aviation and aerospace. 相似文献
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采用渗氢试验和数值计算两种方法研究.了塑性形变对金属中氢的扩散和富集的影响,讨论了4340钢中的氢浓度与塑性形变大小、氢扩散时间及边界条件之间的关系. 相似文献
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总结近年来我国对力学性能不均匀焊接及钎焊接头断裂和疲劳行为所进行的研究,重点介绍力学不均匀性对夹层含平行于交界面裂纹和夹层含垂直于交界面裂纹的焊接接头断裂行为的影响以及在循环载荷或腐蚀环境下力学不均匀性对其裂纹扩展速率的影响。同时介绍EPRI工程估算方法中有关COD和J积分的修正。 相似文献
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Prevention of Hot Cracking by Trailing Cooling along the Weld 总被引:2,自引:0,他引:2
PreventionofHotCrackingbyTrailingCoolingalongtheWeld¥(田锡唐)(杨愉平)(张忠)TIANHitang;YANGYupingZHANGZhong(Dept.ofMaterialScienceandE... 相似文献
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0 IntroductionThinplate shellstructuresofaluminumalloywithhighstrengthareusedinthefieldsofaeronauticsandaerospacemoreandmorewidely .Duetoseriousweldingresidualstressanddistortion ,highsusceptibilitytohotcracking ,lowstrengthandductilityofweldedjoint,thef… 相似文献
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随焊激冷防止焊接热裂纹新方法的研究 总被引:4,自引:0,他引:4
从焊接力学角度提出了随焊激冷防止焊接裂纹的新方法,阐明了随焊激冷防止焊接热裂纹的机理,并就随焊接冷参数对焊接热裂纹的作用进行了研究。通过测量近缝区两点在焊接过程中位移的实时变化过程,验证了随焊激冷防止焊接热裂纹的新方法。 相似文献