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Indian Institute of Technology (IIT) Roorkee 
Modification of chemical composition and properties of A-TIG weld joints of dissimilar steels 
D. K. Dwivedi, Anup Kulkarni, Pratishtha and Anagdha 
Indian Institute of Technology (IIT) Roorkee 
Application type:
Applied - 2019-11-15 
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Indian Institute of Technology (IIT) Roorkee 
The present invention relates to methods for improving the productivity of activated flux-tungsten inert gas welding (A-TIG) during dissimilar metal joining of heat resistant steels. The invention involves novel approaches of development of dissimilar steel joint such as insertion of metallic interlayers in between the faying surfaces and external wire feeding. The invention provides different approaches to allow the control of weld metal composition than conventional joints through different approaches such as use single/multiple interlayers and external wire feeding. Novel approaches provided by the present invention to fabricate A-TIG weld joints dissimilar metal combinations are: 1. Development of A-TIG welded joints between P91 steel and AISI 316L stainless steel by addition of interlayers 2. Development of functionally graded joints between P91 steel and AISI 316L stainless steel by employing multiple interlayers 3. Development of A-TIG welded joints between P92 steel and AISI 304H dissimilar steel combination by external feeding of Nickel based filler wire (ECrNiMo-3) Argon is used as shielding gas for A-TIG welding during this work. Argon is an inert gas and does not react with the substrates. Hence no harmful gases are produced. Additionally, the activated fluxes (oxides) used in the work do not cause environmental hazards. 

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