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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 fatigue strength of cut edges produced by various cutting methods for high-strength steels
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Investigation on fatigue strength of cut edges produced by various cutting methods for high-strength steels

机译：各种切削方法生产高强度钢材疲劳强度的研究

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摘要

Due to the interest in effective light steel constructions, high-strength steels have gained importance. Different thermal cutting processes are frequently used in the metal processing industry. Besides the weld seams, free cutting edges gain technical and economic relevance as locations for potential fatigue cracks. In this investigation, fatigue tests were carried out on 8-mm-thick samples of S355M and S690Q steels at a stress ratio of R = 0.1. The cutting methods used were oxygen, plasma, laser, and waterjet cutting. Quality improvement methods, like shot peening, grinding, and cutting speed reduction, were applied for some series. The surface roughness was measured to classify the specimens into quality groups according to ISO 9013. The cut edge condition was also characterized by hardness and residual stress measurements. The investigation shows that all tested series exceed the FAT100 class and can be classified in FAT125. Specimens ranged in quality group 2 of ISO 9013 according to the roughness achieve FAT140 regardless of cutting technology or material. According to the ISO 9013, most of the specimens are classified in the quality group 2 and group 3. Fatigue strength results are significantly different in one quality group. No prediction can be made. ISO 9013 has a weak connection to fatigue strength. Quality improvement methods have a significant influence on the fatigue strength and can increase it. Due to reduced cutting speeds, the roughness decreases also. It results in an increase of the fatigue strength in all tested series in this study. In order to make a prediction of the fatigue performance, the standard has to be specified and the cutting process as well as the steel strength should be considered.
机译：由于对有效轻钢结构的兴趣，高强度钢的重要性。金属加工工业经常使用不同的热切削工艺。除了焊缝外，自由切削刃除了潜在疲劳裂缝的位置，获得技术和经济相关性。在该研究中，疲劳试验在8mm的S355M和S690Q钢的样品上以R = 0.1的应力比对。使用的切割方法是氧气，等离子体，激光和水射流切割。适用于某些系列的质量改进方法，如射击喷丸，研磨和切削减速。测量表面粗糙度以根据ISO 9013将试样分类为质量基团。切割边缘条件的特征还在于硬度和残余应力测量。调查表明，所有测试系列都超过FAT100类，可以在FAT125中分类。根据粗糙度实现FAT140的ISO 9013的质量组2的标本范围内容无论切割技术还是材料。根据ISO 9013，大多数样本在质量组2和第3组中分类。疲劳强度结果在一个质量群体中显着差异。没有预测可以进行。 ISO 9013具有疲劳的疲劳强度的连接疲软。质量改进方法对疲劳强度具有显着影响，可以增加它。由于切割速度降低，粗糙度也降低。它导致在本研究中所有测试系列中的疲劳强度增加。为了预测疲劳性能，必须指定标准，应考虑切割过程以及钢强度。

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