304不锈钢水下药芯割丝电弧切割机理  

Mechanism of 304 stainless steel underwater flux-cored arc cutting

作　　者：于瑞 黎文航[1] 王俭辛[1] 王加友[1] 吴铭方[1] Sergii Yuri Maksimov YU Rui;LI Wenhang;WANG Jianxin;WANG Jiayou;WU Mingfang;Sergii Yuri Maksimov(Jiangsu University of Science and Technology,Zhenjiang,212013,China;E.O.Paton Electric Welding Institute,Kyiv,03680,Ukraine)

机构地区：[1]江苏科技大学,镇江212013 [2]E.O.Paton Electric Welding Institute,Kyiv,03680,Ukraine

出　　处：《焊接学报》2022年第3期25-30,I0004,共7页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51775255);高端外国专家引进计划项目(G2021014010);镇江市国际科技合作项目(GJ2021014)。

摘　　要：药芯割丝电弧切割(flux-cored wire arc cutting,FCAC)作为一种高效、低成本、安全的水下切割方法,具有广阔的应用前景.由于水下复杂环境的干扰,该方法的不锈钢切割机理仍不明确,采用工艺试验、水下观测和数值模拟相结合的方法对水下割口成形机理进行研究.首先通过工艺试验确定水下切割相关特征参数;其次采用半椭球体热源模拟切割热源,并根据试验观测设置热源的运动和切换方式;最后对工件进行网格划分和水下边界条件设置,使用生死单元法动态模拟切割中熔融金属的去除;对工件上特定点的模拟和实际温度以及切割后的模拟割口与实际割口形貌进行了研究对比,验证该方法数值模拟的准确性.结果表明,水下电弧切割不锈钢割口主要分为“/”型、“||”型和“/”型3种形貌.通过高速摄像观察得出,水下不锈钢切割过程由多个周期型连续穿孔过程组成,通过模拟进行验证,对割口成形过程进行有效预测,有助于进一步优化工艺并进行有效控制.As a high-efficiency, low-cost, and safe underwater cutting method, flux-cored wire arc cutting(FCAC) has broad application prospects. Due to the interference of the underwater complex environment, the stainless steel arc cutting mechanism of this method is still unclear. This research uses a combination of process tests, high-speed camera observation,and numerical simulation. Firstly, the relevant characteristic parameters of underwater cutting are determined through the process test;secondly, the semi-ellipsoid heat source is used to simulate the cutting heat source, and the movement and switching mode of the heat source is set according to the experimental observation;finally, the workpiece is meshed and ascertained the underwater boundary condition, the "birth and death" element method is applied to simulate the removal of molten metal during cutting;by comparing the simulated and actual temperature of measurement point and the kerf after cutting.The results showd that the kerf of underwater flux-arc cutting stainless steel is mainly divided into three types of shapes: "/\" type, "| |" type and "/" type. The underwater stainless steel cutting process consists of multiple periodic continuous perforation processes observed by high-speed camera. It is also validated by simulation to predict the kerf forming process effectively, which helps to further optimize the process and control it effectively.

关 键 词：水下药芯电弧切割 数值模拟 水下切割机理 有限元分析 

分 类 号：TG456.5[金属学及工艺—焊接]