Study of Inherent Strain Distribution needed for High Quality System of Welded Structure

高质量焊接结构系统所需的固有应变分布研究

基本信息

批准号：
10650709
负责人：
TERASAKI Toshio
金额：
$ 2.24万
依托单位：
KYUSHU INSTITUTE OF TECHNOLOGY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
1998
资助国家：
日本
起止时间：
1998 至 1999
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-10650709/
关键词：
Average Temperature Rise Inherent Strain Laser Welding Plasuma Cutting Laser Cutting TIG Welding Cutting Cutting Heat Input プラズマ溶接溶接継手残留応力突合せ継手

项目摘要

This paper deals with the distribution of inherent strain dominating high quality of welded structure. Firstly, measurements of inherent strain generated in a butt joint and a bead on plate have been made by the sequential removal of layers. It is shown from experiments that the distribution of inherent strain in a bead on plate is almost the same as one in a butt joint. The rise of average temperature, which is derived from similar law of themal conductivity and is calculated from welding conditions and plate sizes, is useful for arranging the distribution of inherent strain. The plate length does not affect the distribution of inherent strain on the center plane of plate length, when the plate length is above one and half times as long as the width of welded plate.Second, measurements of heat input generated in the plate cut by a laser cutting and a plasma cutting have been made for investigating a predictive equation. The heat input by cutting is called as the residual energy in the cutting field and is important factor for controlling the deformation generated through a thermal cutting process. The total energy needed for the thermal cutting was studied by many researchers and the predictive equation of the total energy was proposed by Wells. However the equation predicting the residual energy was not studied. The equation for the residual energy is derived from modifying Wells equation. By comparing the experimental data with the predicted values, it is shown that the proposed equation is applicable to the evaluation of the residual energy.

本文讨论了影响焊接结构高质量的固有应变的分布。首先，通过顺序去除层来测量对接接头和板上焊道中产生的固有应变。实验表明，板上焊道的固有应变分布与对接接头的固有应变分布几乎相同。平均温度的升高源自类似的热导率定律，并根据焊接条件和板材尺寸计算得出，对于安排固有应变的分布非常有用。当板的长度大于焊接板宽度的一倍半时，板的长度不影响板长度中心平面上的固有应变的分布。二、测量板切割时产生的热输入已经进行了激光切割和等离子切割来研究预测方程。切削输入的热量称为切削场的残余能量，是控制热切削过程中产生的变形的重要因素。许多研究者对热切割所需的总能量进行了研究，并由Wells提出了总能量的预测方程。然而，没有研究预测残余能量的方程。剩余能量的方程是通过修正Wells方程推导出来的。通过将实验数据与预测值进行比较，表明所提出的方程适用于剩余能量的评估。