Zmitrowicz Przemysław, Kawiak Michał, Kochmański Paweł, Baranowska Jolanta
Faculty of Mechanical Engineering and Mechatronics, West Pomeranian University of Technology in Szczecin, 70-310 Szczecin, Poland.
JW Steel Construction Sp. z o.o., Sp. k., 71-836 Szczecin, Poland.
Materials (Basel). 2021 Dec 19;14(24):7868. doi: 10.3390/ma14247868.
K-TIG (Keyhole Tungsten Inert Gas) method is a new, emerging welding technology that offers a significant acceleration of the joining process, even for very thick plates. However, its potential for welding of certain materials is still unknown. Particularly challenging are duplex steels as this technology does not allow the use of a filler material, which is crucial for these steels and for weld joint microstructure adjustment. In order to demonstrate the suitability of this technology for single-pass welding of 1.4462 duplex steel detailed studies of the microstructure of the weld joints obtained for different linear energies were carried out and discussed with respect to their mechanical properties. According to the results obtained, the heat-affected zone (HAZ) shows a microstructure similar to the HAZ of duplex steel welded with the traditional TIG multi-pass methods. However, the weld, due to the lack of filler material, had a microstructure different to that typical for duplex steel welded joints and was also characterized by an increased content of ferrite. However, all joints, both in terms of microstructure and mechanical properties, met the requirements of the relevant standards. Moreover, the K-TIG process can be carried out in the linear energy range typical of duplex steel welding, although further optimization is needed.
K-TIG（小孔钨极惰性气体保护焊）方法是一种新兴的焊接技术，即使对于非常厚的板材，它也能显著加快焊接过程。然而，其焊接某些材料的潜力仍不为人知。双相钢尤其具有挑战性，因为该技术不允许使用填充材料，而填充材料对于这些钢材以及焊缝微观结构调整至关重要。为了证明该技术对1.4462双相钢单道焊接的适用性，针对不同线能量获得的焊缝微观结构进行了详细研究，并就其力学性能进行了讨论。根据所得结果，热影响区（HAZ）呈现出与传统TIG多道焊接双相钢的热影响区相似的微观结构。然而，由于缺乏填充材料，焊缝的微观结构与双相钢焊接接头的典型微观结构不同，其铁素体含量也有所增加。然而，所有接头在微观结构和力学性能方面均符合相关标准的要求。此外，K-TIG工艺可在双相钢焊接的典型线能量范围内进行，不过仍需进一步优化。
