厚壁焊接油井管精密电磁加热隐性缺陷机制及预控

项目名称： 厚壁焊接油井管精密电磁加热隐性缺陷机制及预控

项目编号： No.51505418

项目类型： 青年科学基金项目

立项/批准年度： 2016

项目学科： 机械、仪表工业

项目作者： 韩毅

作者单位： 燕山大学

项目金额： 20万元

中文摘要： 油井管是石油工业的基础，焊接油井管替代无缝管已成为世界范围主流趋势，深海等环境恶劣油气田对油井管壁厚规格及质量性能要求尤为苛刻。然而，随着油井管壁厚规格增大，电磁加热集肤、临近和圆环效应导致的焊缝温度不均现象加剧，由此引起的宏微观质量缺陷严重影响了厚壁焊接油井管服役安全。为揭示复杂电磁环境下厚壁焊管焊缝内部微观组织、残余应力及机械性能分布等隐性缺陷产生机理和演化规律，本课题通过建立厚壁焊管焊接和热处理电磁感应加热全过程电-磁-热-组织多场耦合模型，实现高频加热冷焊区、过烧区，中频加热盲区、重复区、过度区内温度场和微观组织的高精度预测，并引入缺陷面积率作为焊管隐性缺陷的量化评价指标，揭示感应加热焊接功率、速度等诸多工艺参数对隐性缺陷的影响规律和作用机理。不仅为量化表征焊管各类隐性缺陷特性、差异和作用机制提供新思路，同时为探索电磁加热温度不均的共性问题和促进一些新的发现创造有力条件。

中文关键词： 焊接；热处理；感应加热；隐性缺陷；残余应力

英文摘要： Oil well pipe is the basis for the oil industry, seamless oil well pipe replaced by welded pipe has become the main trend of the world. Deep sea and other harsh environment oil and gas fields for wall thickness and quality performance requirements of oil well pipe are particularly harsh. However, with the oil pipe wall thickness gauge increases, the skin, near and ring effect of electromagnetic heating lead to the phenomenon of weld temperature uneven, macro and micro quality defects resulting in a serious impact on thick welded oil pipe security service. To reveal the microstructure, mechanical properties and residual stress distribution and evolution mechanism of the hidden defects in complex electromagnetic environment of the thick-walled pipe, the project by establishing the whole process of thick-walled pipe welding and heat treatment induction heating magnetic - temperature - microstructure coupled model, precision forecast to achieve the temperature and microstructure field of high-frequency heating cold welding area, burned area, medium frequency heating blind area, repeat area and over heated area, and the introduction of the defect area ratio as a pipe hidden defects quantified evaluation, reveal the influence and mechanism of induction heating welding power、speed and many other parameters and on recessive defects. Not only provide new ideas for quantitative characterization of various types of hidden defect characteristics, differences and mechanisms, but aslo create favorable conditions for the exploration of electromagnetic heating temperature uneven common problems and promote some new discoveries.

英文关键词： weld;heat treatment;induction heating ;hidden defects;residual stress