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Fatigue properties of friction stir welded butt joint and base metal of MB8 magnesium alloy 被引量:1
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作者 何柏林 熊磊 +3 位作者 于影霞 吕宗敏 满华 江民华 《China Welding》 EI CAS 2016年第1期1-7,共7页
The fatigue properties of friction stir welded (FSW) butt joint and base metal of MB8 magnesium alloy were investigated. The comparative fatigue tests were carried out using EHF-EM2OOK2-070-IA fatigue testing machin... The fatigue properties of friction stir welded (FSW) butt joint and base metal of MB8 magnesium alloy were investigated. The comparative fatigue tests were carried out using EHF-EM2OOK2-070-IA fatigue testing machine for both FSW butt joint and base metal specimens. The fatigue fractures were observed and analyzed using a scanning electron microscope of JSM-6063LA type. The experimental results show that the fatigue performance of the FSW butt joint of MB8 magnesium alloy is sharply decreased. The conditional fatigue limit (2 x 106) of base metal and welded butt joint is about 77.44 MPa and 49. 91 MPa, respectively. The conditional fatigue limit (2 x 106 ) of the welded butt joint is 64.45% of that of base metal. The main reasons are that the welding can lead to stress concentration in the flash area, tensile welding residual stress in the welded joint( The residual stress value was 30. 5 MPa), as well as the grain size is not uniform in the heat-affected zone. The cleavage steps or quasi-cleavage patterns present on the fatigue fracture surface, the fracture type of the FSW butt joint belongs to a brittle fracture. 展开更多
关键词 MB8 magnesium alloy friction stir welded butt joint fatigue property fatigue fracture
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Experimental investigation on tensile strength of butt welded joint post high temperatures 被引量:1
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作者 曹平周 陈建锋 赵文涛 《China Welding》 EI CAS 2009年第3期21-26,共6页
In order to investigate the laws of variation on tensile strength of butt welded joint post high temperatures, the wide plate tension tests for butt welded joint were conducted after cooling down from different high t... In order to investigate the laws of variation on tensile strength of butt welded joint post high temperatures, the wide plate tension tests for butt welded joint were conducted after cooling down from different high temperatures. The tests indicate that specimens appear ductile fracture at the steel plate during the tension tests after cooling down. The maximum temperatures undergone and the cooling pattern are major factors influencing tensile strength of butt welded joint post high temperatures. The tensile strength mostly reduces by 8% within 900℃. Based on the experimental results, the paper proposes the calculation formulas of tensile strength of butt welded joint post high temperatures. The conclusions of the paper supply references for evaluation damage and reinforcement of steel structure post fire. 展开更多
关键词 butt welded joint post high temperatures tensile strength experimental investigation
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Improving fatigue performance of welded joints of X65 pipeline steel by UIT 被引量:1
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作者 柳锦铭 陈通 张玉凤 《China Welding》 EI CAS 2005年第2期135-139,共5页
Treating weld toes properly can improve the fatigue performance. Ultrasonic impact treatment (UIT) is a more effective and convenient method to enhance the fatigue strength of welded joints and suchlike structures. ... Treating weld toes properly can improve the fatigue performance. Ultrasonic impact treatment (UIT) is a more effective and convenient method to enhance the fatigue strength of welded joints and suchlike structures. Fatigue tests were conducted on the specimens made of X65 pipeline steel. The test specimens were investigated on the fatigue strength and the fatigue life at the same stress range level by comparing the ones peened by UIT with the others without the treatment: the fatigue strength of the specimens as UIT, 90% of the fatigue strength of the base mental, is increased by 38% compared with that of as welded only; the fatigue life of the ones as UIT is prolonged by 11 multiples of the ones as welded only. 展开更多
关键词 X65 pipeline ultrasonic impact treatment fatigue life welded butt joint
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