Improving Mechanical Properties of Dissimilar Material Friction Welds

Abstract:

Friction welding of stainless steel to titanium with aluminum insert metal was investigated to improve the mechanical properties of the joints. Two different methods were used to insert the aluminum as a barrier between to substrates. The process parameters were found to be different for these two methods to obtain the sound welds. The friction welds between stainless steel and titanium with aluminum insert prevented the formation of brittle intermetallic compounds in the weld interface. A new intermetallic compounds such as AlTi and Al₃Ti were formed between titanium and aluminum insert metal interface which are more ductile than the FeTi and CrTi intermetallic compounds. The joints characterized that the aluminum insert metal improved the metallurgical reaction at the weld interfaces thus indicates the results of decrease in microhardness of the intermetallic compounds which have major influence on the strength of the joints. The tensile strength of the aluminum insert welds was higher than the direct joints between the stainless steel and titanium. Higher tensile properties were attained at higher upset pressure condition due to the effect of higher force upon the welded materials and the remnant narrower thickness of insert metal.

• Periodical: Applied Mechanics and Materials (Volume 877)
• Pages: 157-162
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.877.157
• Online since: February 2018
• Authors: Muralimohan Cheepu*, V. Muthupandi, Woo Seong Che
• Keywords: 304 Austenitic Stainless Steel, Aluminium Interlayer, Friction Welding, Intermetallics, Mechanical Properties, Titanium

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