Robustness of HFMI treatment in different weld qualities according to ISO 5817 was studied, and fatigue testing of the treated samples was carried out in order to investigate the effect of the weld quality prior treatment. The results show that HFMI-treated welds with weld quality level D shows fatigue life improvements that fall within the IIW recommendations for HFMI. No significant influence from the HFMI operator or HFMI equipment on the fatigue life was found. However, the scatter in fatigue testing results varied with HFMI operator and indicated that different HFMI operators could produce consistent treatment results. A considerable effect on fatigue life from HFMI tool radius was found, where the 2-mm tool radius showed considerably greater fatigue life compared with the 1.5-mm tool radius. According to IIW (Marquis and Barsoum 2016), for steel grade S_Y = 700 MPa, the fatigue strength recommendation is FAT 160 (m = 5) for transverse stiffener–welded joints with as-welded quality B according to ISO 5817 (ISO/TC 44/SC 10 2011), prior to treatment. It can be observed in the current study that fatigue-tested HFMI-treated welded joints, welded with weld quality D, are in good agreement with the IIW recommendations.

根据ISO 5817，研究了在不同焊接质量下进行HFMI处理的稳健性，并对处理后的样品进行了疲劳测试，以研究焊接质量在处理前的影响。结果表明，焊缝质量等级为D的经过HFMI处理的焊缝，其疲劳寿命得到了改善，符合HFMI的IIW建议。没有发现HFMI操作员或HFMI设备对疲劳寿命有重大影响。但是，疲劳测试结果的分散程度因HFMI操作员而异，表明不同的HFMI操作员可以产生一致的治疗结果。发现HFMI刀具半径对疲劳寿命有相当大的影响，与1.5mm刀具半径相比，2mm刀具半径显示出明显更长的疲劳寿命。根据IIW（Marquis and Barsoum 2016），_Y  = 700 MPa， 根据ISO 5817（ISO / TC 44 / SC 10 2011）的规定，对于焊接质量为B的横向加劲肋焊接接头，推荐的疲劳强度为FAT 160（m = 5）。在当前的研究中可以观察到，经过疲劳测试的HFMI处理的焊接接头的焊接质量为D，与IIW的建议非常吻合。