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首页> 外文期刊>Welding in the World: Journal of the International Institute of Welding: Journal of the International Institute of Welding >Investigation on joint characteristics of laser beam welded press hardenable ultra-high strength steels with ferritic-martensitic and martensitic microstructure
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Investigation on joint characteristics of laser beam welded press hardenable ultra-high strength steels with ferritic-martensitic and martensitic microstructure

机译：铁素体-马氏体和马氏体组织的激光束焊接压制成型可淬硬超高强度钢的接头特性研究

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摘要

The introduction of stainless ultra-high strength steels with ferritic-martensitic and martensitic microstructure into sheet metal manufacturing depends on proper welding processes for these steel grades. The chromium and carbon content as well as the lack of appropriate process information for thermal joining of these steel grades in press hardened condition with UTS of up to 2.000 MPa at 15% fracture strain classifies the weldability of these materials as limited. Efficient heat control and minimum heat input enable the welding of ferritic-martensitic and martensitic stainless steels by laser beam. This paper presents the results of strength evaluations of laser welded joints for the steel grades 1.4003, 1.4021, and 1.4034 in similar and dissimilar combinations with already established steels. By maintaining optimal welding conditions with pre- and postheating, and with respect to the testing angle and speed, press hardenable steels with ferritic-martensitic and martensitic microstructure overtop joining strength of already established 1.5528 by approx. 20 %. The paper gives an overview of the press hardening conditions, the welding parameterization, the welding seam hardness profiles for different steel-combination-arrangements, and the selected force-displacement-behavior. The paper finalize with a comparison of joint properties for considered material combinations for simple one-joint-specimen and complex structure specimen.
机译：将具有铁素体-马氏体和马氏体微结构的超高强度不锈钢引入钣金制造取决于这些钢种的合适焊接工艺。铬和碳的含量，以及在15％断裂应变下，UTS高达2.000 MPa的压力硬化条件下这些钢种的热连接的适当工艺信息的缺乏，将这些材料的可焊接性归为有限。高效的热控制和最小的热量输入使得能够通过激光束焊接铁素体-马氏体和马氏体不锈钢。本文介绍了1.4003、1.4021和1.4034等级的激光焊接接头的强度评估结果，这些焊接与已建立的钢具有相似和不相似的组合。通过在预热和后热以及测试角度和速度方面保持最佳焊接条件，具有铁素体-马氏体和马氏体显微组织的顶压结合强度已经确定的1.5528的可压制硬化钢大约为1.5528。 20％。本文概述了冲压硬化条件，焊接参数设置，不同钢组合布置的焊缝硬度分布以及所选的力-位移特性。本文最后通过比较简单的单接头试样和复杂结构试样的材料组合的接头特性进行比较。

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