摘要
船用中厚板因焊接产生的较大变形严重影响结构平整度。本文采用CO_(2)气体保护焊制备14 mm厚AH36钢对接接头,通过自主研制的电磁感应加热背烧装备来矫正对接接头的面外变形,测试并分析AH36对接接头及其背烧后的微观组织、力学性能、横向残余应力及面外变形。构建焊接-背烧有限元分析方法,预测AH36钢对接焊及接头背烧过程中的热传导及力学响应;基于变形理论,计算AH36对接焊及接头背烧后的横向弯矩。结果表明:AH36钢母材及其背烧后的微观组织均以渗碳体为主,背烧后晶粒尺寸略微增大;背烧后的AH36抗拉强度及室温冲击值与母材基本一致,且母材及其背烧后均未发生弯曲断裂;背烧对AH36对接接头的横向残余应力分布趋势几乎无影响,拉应力极值略微增大;背烧使得对接接头的背部近表面区产生较大的横向压缩塑性应变,并通过横向弯矩矫正面外变形。
The welding displacement of marine medium plate caused by welding seriously affects the structural integrity.Butt-welded joint of AH36 steel with the thickness of 14 mm was fabricated using CO_(2) welding process and the out-of-plane displacement was straightened using self-developed electromagnetic induction back-heating equipment.A series of experiments were conducted to measure the microstructure,mechanical performance,transverse residual stress and out-of-plane displacement.A welding-back-heating numerical simulation method was proposed,and applied to predict the heating conduction,stress,strain and out-of-plane displacement during the processes of butt welding and back heating.Based on the deformation theory,the transverse bending moment after butt welding and back heating was computed.Results show that the microstructure is mainly cementite and back heating almost has no influence on either the microstructu or mechanical performance.The peak value of transverse residual stress is mainly at the weld seam and becomes larger due to back heating.The back heating generates a larger transverse compressive plastic strain near the surface of AH36 plate,thereby obviously straightening the out-of-plane deformation through the transverse bending moment.
作者
张庆亚
吴百公
王秋平
王兴宇
张珍睿
周宏
刘平
许静
ZHANG Qing−ya;WU Bai−gong;WANG Qiu−ping;WANG Xing−yu;ZHANG Zhen−rui;ZHOU Hong;LIU Ping;XU Jing(Marine Equipment and Technology Institute,Jiangsu University of Science and Technology,Zhenjiang 212003,China;School of Naval Architecture and Ocean Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China;School of Architecture and Civil Engineering,Jiangsu University of Science and Technology,Zhenjiang 212003,China)
出处
《船舶力学》
北大核心
2025年第8期1288-1298,共11页
Journal of Ship Mechanics
基金
国家自然科学基金资助项目(52371323)
江苏省高校(高技术船舶)协同创新项目(XTCX202407
XTCX202409)。
关键词
中厚板
焊接变形
感应加热
数值模拟
medium plate
welding displacement
induction heating
numerical simulation
