In 2016, the International Institute of Welding (IIW) published a recommendation for high-frequency mechanical impact (HFMI) treatment for improving the fatigue strength of welded joints. Since the publication of the HFMI recommendations, numerous of studies have been published with a considerable amount of new fatigue test data focusing on various aspects of the improvement; influence of base material yield strength, and loading and thickness effects. Since the data was scarce covering some of the aspects when the recommendation was published, re-evaluating the recommendation with these new test data, presented within this work, will further validate and extend the recommendations. The analysis reveals that the recommended improvement of fatigue classes based on the base material yield strength is well applicable. In addition, the reduction of fatigue classes for higher R-ratios up to the defined value of R = 0.52 is well considered. Finally, the practicability of the thickness correction factor is also confirmed by leading to a conservative fatigue assessment. The ratio of the statistically evaluated FAT class to the recommended value is shown to be conservative with a value of above one for almost every data set; however, even the ratio is below one in some minor cases, every single test data point in this study is assessed conservatively validating the applicability of the recommendation.

中文翻译：

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屈服强度，R比和板厚增加对高频机械冲击（HFMI）处理的钢接头的抗疲劳性的影响

2016年，国际焊接学会（IIW）发布了有关高频机械冲击（HFMI）处理的建议，以改善焊接接头的疲劳强度。自从HFMI建议发布以来，已经发表了许多研究报告，其中包含大量的新疲劳试验数据，重点放在改进的各个方面。基材屈服强度的影响，以及载荷和厚度的影响。由于在发布建议时数据很少涉及某些方面，因此本工作中提供的这些新测试数据对建议进行重新评估将进一步验证和扩展建议。分析表明，基于基础材料屈服强度建议的疲劳等级改进是适用的。此外，可以考虑将较高R比率的疲劳等级降低到R = 0.52的定义值。最后，通过进行保守的疲劳评估也证实了厚度校正因子的实用性。经统计评估的FAT类与推荐值的比率显示为保守值，几乎每个数据集的值都大于1。但是，即使该比率在某些较小的情况下也低于1，该研究中的每个测试数据点都经过保守评估，以验证该建议的适用性。经统计评估的FAT类与推荐值的比率显示为保守值，几乎每个数据集的值都大于1。但是，即使在某些较小的情况下该比率也低于1，该研究中的每个测试数据点均经过保守评估，以验证该建议的适用性。经统计评估的FAT类与推荐值的比率显示为保守值，几乎每个数据集的值都大于1。但是，即使该比率在某些较小的情况下也低于1，该研究中的每个测试数据点都经过保守评估，以验证该建议的适用性。