TIG熔修提高平台立焊接头疲劳强度及实船应用  

Increase of the fatigue strength in a vertical weld joint of offshore drilling plateform and actual application

作　　者：李冬霞[1] 贾宝春[2] 刘元杰[2] 

机构地区：[1]中原工学院基础部,郑州450007 [2]郑州机械研究所,郑州450052

出　　处：《机械强度》2003年第3期271-274,共4页Journal of Mechanical Strength

摘　　要：海洋平台的实际结构中大量裂纹产生在结构的立焊焊缝位置上。针对立焊特点 ,试验采用模拟实际结构的异种钢T型焊接接头 ,选用实际船台材料A5 14 EH3 6,制定适合立焊的熔修工艺及规范 ,并进行相应的疲劳试验。利用最小二乘法给出立焊时疲劳寿命的估算式及S—N曲线。试验分析结果表明 ,熔修试件疲劳强度提高 49.4% ,寿命增加 6倍。该补焊熔修工艺已试用于海洋平台实际结构的补焊修复之中。According to the causes in which most cracks are produced in vertical weld beads of actual structure in ocean platform, based upon the vertical weld bead characteristic the model tests were performed. Adopting the T shape welding joint and the special steel A514 EH36 of actual structure, the TIG (tungsten inert gas) dressing technique parameters were established. The fatigue specimen tests were done also. The S—N curve and life estimation equation under vertical weld after TIG dressing are presented by least square method. It was found that the fatigue strength has increased by 49.4% and fatigue life was up by 6 times before TIG dressing. The effect increasing specimen fatigue strength by using TIG technique is proved by fatigue tests. And TIG dressing is applied to repair the offshore drilling platforms weld structure. Therefore the TIG technique gives a big potential for engineering application.

关 键 词：海洋平台 TIG熔修 立焊接头 疲劳强度 疲劳寿命 立焊焊缝 补焊 

分 类 号：U674.381[交通运输工程—船舶及航道工程] TG405[交通运输工程—船舶与海洋工程]