In recent years, microwave welding has received attention for joining of similar and dissimilar metals due to its major advantages like volumetric heating, selective heating of target materials, energy saving and sustainability. In the present work, the microstructural characteristics and mechanical properties of Inconel-625-welded joints developed through microwave hybrid heating and those produced by TIG welding have been compared. Welding through microwave hybrid heating (MHH) was carried out using Inconel-625 interface filler powder of 50 μm size, while TIG welding was carried out using ERNiCrMo-3 filler wire of 2.5 mm diameter which had a composition similar to that of Inconel-625 alloy. The welded samples were characterized in terms of microstructural observations and tensile and microhardness properties. The study reveals that the joining of bulk metals through MHH has potential in manufacturing industries in the near future. TIG-welded joints exhibit superior strength compared to MHH joints because of fine grain structure, lower amount of segregation in the weld zone and also smaller width of the weld zone in joints developed through MHH. The hardness in the weld zone of welded joints in both the cases is observed to be almost the same. Use of a finer interface filler of 20–25 μm particle size may further contribute to improving the mechanical properties of the joints developed through MHH. Furthermore, the use of industrial microwave furnace may improve the strength of MHH-welded joints as the process may be integrated with real-time temperature measurement of the joint zone so as to achieve better control over the process.

近年来，微波焊接由于其主要优点（如体积加热，目标材料的选择性加热，节能和可持续性）而受到了相似和异种金属连接的关注。在目前的工作中，比较了通过微波混合加热和TIG焊接产生的Inconel-625焊接接头的组织和力学性能。微波混合加热（MHH）的焊接使用尺寸为50μm的Inconel-625界面填充粉末，而TIG焊接使用的是直径为2.5 mm的ERNiCrMo-3填充焊丝，其成分类似于Inconel-625合金。根据显微组织观察以及拉伸和显微硬度特性对焊接样品进行了表征。该研究表明，在不久的将来，通过MHH连接散装金属在制造业中具有潜力。与MHH接头相比，TIG焊接接头具有更高的强度，这是因为其细小晶粒结构，较低的焊接区偏析量以及通过MHH开发的接头的焊接区宽度较小。在两种情况下，焊接接头的焊接区域的硬度几乎相同。使用粒度为20–25μm的更精细的界面填料，可能会进一步有助于改善通过MHH开发的接头的机械性能。此外，使用工业微波炉可以提高MHH焊接接头的强度，因为该过程可以与接头区域的实时温度测量集成在一起，从而实现对过程的更好控制。