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Aluminium and its alloys have a wide range of application in the manufacturing industries. Welding process is essential for manufacturing the different varieties of products such as frames, building structures, pressure vessels, automotive components etc. Metal Inert Gas and Tungsten Inert Gas (TIG) welding are commonly used fusion welding processes for joining Aluminium Alloys (AA). It is difficult to weld AA as compared to steel due to its high thermal, electrical conductivity and high expansion coefficient. TIG welding has restricted its ability to weld thick structure in single pass. A new advancement of TIG welding namely Activated-TIG has been developed. In this method a ultra-deep penetration is obtained in a single pass. This paper presents the state-of-the-art review on recent development in TIG welding process for joining 5xxx and 6xxx AA. The effects of various welding parameters such as welding speed, welding current and shielding gas flow rate on the yield and tensile strength have also been explored.

Microwave joining has received attention of researchers for joining of metals and alloys due to its major advantages like volumetric heating, selective heating of target materials, reduced heat affected zone, better physical properties, energy saving and eco-friendly. This paper present the state of the art major research developments in the field of microwave joining by broadly classifying the progresses in this field into four categories such as specimens to be joined; types of susceptors; interface powder based developments and progresses in experimental set-ups. An attempt has been made to bring out the major progresses related to microwave joining of metals.