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首页> 美国卫生研究院文献>Materials >Advantages of the Application of the Temper Bead Welding Technique During Wet Welding
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Advantages of the Application of the Temper Bead Welding Technique During Wet Welding

机译：回火焊缝技术在湿式焊接中的应用优势

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Thermo-mechanically rolled S460ML steel was chosen for welding in underwater wet welding conditions by covered electrodes. The main aim of this study was to check the weldability for fillet welds in a water environment by controlled thermal severity (CTS) tests and to check the influence of temper bead welding (TBW) on the weldability of the investigated steel. Non-destructive and destructive tests showed that S460ML steel has a high susceptibility to cold cracking. In all joints, hardness in the heat-affected zone (HAZ) was extended to the 400 HV10 values. Microscopic testing showed the presence of microcracks in the HAZ of all welded joints. TBW was chosen as the method to improve the weldability of the investigated steel. This technique allows for the reduction of the maximum hardness in the HAZ below the critical value of 380 HV10, as stated by the EN-ISO 15614-1:2017. It was determined that for S460ML steel, from the point of view of weldability, the pitch between two beads should be in the range 75%–100%. Also, if the pitch between two beads increases, the hardness, grain size, and number of cracks decreases. In all specimens where the hardness of the HAZ was below 380 HV10, there were no microcracks.
机译：选择热机械轧制的S460ML钢在水下湿式焊接条件下通过覆盖电极进行焊接。这项研究的主要目的是通过控制热强度（CTS）测试来检查水环境中角焊的可焊性，并检查回火焊道（TBW）对所研究钢的可焊性的影响。无损和破坏性测试表明，S460ML钢具有很高的冷裂敏感性。在所有接头中，热影响区（HAZ）的硬度均扩展至400 HV10值。显微测试表明，所有焊接接头的热影响区都存在微裂纹。选择TBW作为提高被研究钢的可焊性的方法。如EN-ISO 15614-1：2017所述，此技术可将热影响区的最大硬度降低到380 HV10的临界值以下。从可焊性的角度确定，对于S460ML钢，两个焊道之间的间距应在75％–100％的范围内。同样，如果两个小珠之间的间距增加，则硬度，晶粒尺寸和裂纹数量也会减少。在所有HAZ硬度低于380 HV10的样品中，没有微裂纹。

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