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Study on details of a new welding procedure that had good fatigue strength

具有良好疲劳强度的新焊接工艺的细节研究

基本信息

批准号：
07555310
负责人：
TOMITA Yasumitsu
金额：
$ 3.46万
依托单位：
Osaka University
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
1995
资助国家：
日本
起止时间：
1995 至 1997
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-07555310/
关键词：
Welding procedure Fatigue Strength Boxing fillet weldment Non-load carrying type Load carrying type 荷重非伝達溶接形式

项目摘要

Boxing fillet weldments are found in many parts of a ship's structure. Both fatigue strength and the welding procedure of boxing fillet weldments are primary concerns of ship builders.Fatigue tests and FEM stress analysis were performed for specimens with boxing fillet welded attachments of four different end-conditions : conventional boxing fillet weldment (continuous round fillet weld) and three new types of boxing fillet weldment with different end-conditions (non-continuous round fillet weld). Conventional weldments were made by two welding processes : manual arc and C02 semi-automatic welding, and two welding positions : flat and a combination of horizontal and over-head position and new weldments only by C02 semi-automatic welding and flat position. Fatigue tests were both load controlled axial loading type (non-load carrying type), and a combination of shear and bending loading type (load carrying type). The influence of both the end-conditions and welding procedures on fatigue strength of the boxing fillet weldments have been examined.The main points are as follows :1) The configuration of the weld bead varies depending upon both the welding process and position, and it slightly influences the fatigue strength of boxing fillet weldments.2) For the fatigue tests of non-load carrying type, the three new type boxing fillet weldments (non-continuous types) exhibit at least the same fatigue strength as the conventional boxing fillet weldment (continuous type).3) For the fatigue tests of load carrying type, new type boxing fillet weldments, overrun type, show a little lower fatigue strength than that of conventional boxing fillet weldments.4) The overrun type of boxing fillet weldment is applicable to wet areas provided that the contact surfaces of the welded members are entirely closed with weld bead.

装箱角焊件在船舶结构的许多部分都有。针对四种不同端部条件的箱形角焊接头试件进行疲劳试验和有限元应力分析，即传统箱形角焊接头（连续圆角焊）和三种不同端部条件的新型箱形角焊接头（非连续圆角焊）。常规焊件采用手工电弧焊和C 02半自动焊两种焊接工艺，平焊和平焊与仰焊相结合两种焊接位置，而新焊件仅采用C 02半自动焊和平焊位置。疲劳试验为载荷控制的轴向加载类型（非承载类型）和剪切和弯曲加载类型的组合（承载类型）。研究了端部条件和焊接工艺对箱形角焊件疲劳强度的影响，主要内容如下：1）焊缝形状随焊接工艺和焊接位置的不同而变化，对箱形角焊缝的疲劳强度影响不大; 2）在非承载型疲劳试验中，对三种新型箱形角焊缝进行了疲劳试验（非连续型）表现出至少与传统的装箱角焊件相同的疲劳强度（连续型）。3）对于承载型、新型箱形角焊件、超限型、显示出比传统的箱形角焊缝的疲劳强度稍低的疲劳强度。如果焊接构件的接触面完全用焊道封闭，则超限型装箱角焊件适用于潮湿区域。