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Numerical simulation of an electromagnetic weld pool control for high power laser beam welding of high thickness metal parts

高功率激光束焊接高厚度金属件的电磁熔池控制数值模拟

基本信息

批准号：
203284221
负责人：
Professor Dr.-Ing. Michael Rethmeier, since 12/2013
金额：
--
依托单位：
Bundesanstalt für Materialforschung und -prüfung (BAM)
依托单位国家：
德国
项目类别：
Research Grants
财政年份：
2011
资助国家：
德国
起止时间：
2010-12-31 至 2015-12-31
项目状态：
已结题

来源：
https://gepris.dfg.de/gepris/projekt/203284221?language=en
关键词：
Numerical simulation electromagnetic weld pool

项目摘要

The positive results of computer simulation of electromagnetic meltpool control as well as their experimental verification for high power laser beam welding of thick plates of AlMg3-alloy and austenitic stainless steel Type 304 gained in the first phase of the project show good perspectives for applicability of this technology. The extension of the technology for the case of ferromagnetic materials seems to be very attractive. The prolongation option was already considers in the original project. The molten metal and partially the material in HAZ, which is overheated above the Curie-Temperature TCurie , do not exhibit ferromagnetic properties. The rest part of the workpiece is ferromagnetic and hinders the transfer of generated magnetic fields to the meltpool. In order to minimize the influence of the ferromagnetic zone we suggest to guide a strong DC magnetic field into material, in order to magnetize the workpiece over the saturation limit. The experimental trials will take place first with light ferromagnetic duplex steel, where application of this method would be possible at low magnetic field strength values. For this material the magnetic fields values of 1 T would be enough for orientation of magnetic domains correspondent to direction of the external magnetic field. Herewith the effective permeability is very low. The simulation of ferromagnetic zone will take place by using of OPERA software, which enables a simulation of nonlinear effects like temperature dependent hysteresis and saturation effects in ferromagnetic materials. In molten pool zone the new computer simulation by means of COMSOL-Multiphysics will be carried out. This will use the results of OPERA-Simulations as boundary conditions at the border between ferromagnetic and non-ferromagnetic regions (T = TCurie) .The results obtained from welding trials and computer simulations will be transferred to the normal mild steels.

电磁熔池控制的计算机模拟以及在大功率激光焊接铝镁合金厚板和304奥氏体不锈钢厚板的试验验证中取得了积极的结果，显示了该技术的良好应用前景。铁磁材料的情况下的技术的扩展似乎是非常有吸引力的。在最初的项目中已经考虑了延长的选择。熔化的金属和部分HAZ中的材料在居里温度TCurie以上过热，不表现出铁磁性质。工件的其余部分是铁磁性的，并阻碍产生的磁场转移到熔池。为了最大限度地减少铁磁区的影响，我们建议引导一个强直流磁场进入材料，以磁化工件超过饱和极限。实验性试验将首先用轻铁磁性双相钢进行，其中在低磁场强度值下可以应用该方法。对于这种材料，1 T的磁场值将足以使磁畴的取向对应于外部磁场的方向。因此，有效渗透率非常低。铁磁区的模拟将使用OPERA软件进行，该软件能够模拟铁磁材料中的非线性效应，如温度相关的磁滞和饱和效应。在熔池区采用COMSOL-Multiphysics软件进行新的计算机模拟。这将使用OPERA-Simulations的结果作为铁磁区和非铁磁区（T = TCurie）之间的边界条件。从焊接试验和计算机模拟获得的结果将被转移到普通软钢。