With deep regret and profound sadness we inform the welding community that a perennial representative of E.O. Paton Electric Welding Institute of the National Academy of Sciences of Ukraine (PWI) to the International Institute of Welding Kostyantyn Yuschenko, Academician of the National Academy of Sciences of Ukraine, Professor, Doctor of Sciences, Honored Worker of Science and Technology of Ukraine, passed away on 09 March 2023, at the age of 87.

He was born in the city of Kremenchuk, Poltava oblast, Ukraine. Having graduated from Kyiv Polytechnic Institute (now - National Technical University of Ukraine “Igor Sikorsky Kyiv Polytechnic Institute”) in 1958, he became a member of the scientific team of PWI, and he remained so until his last day.

He has made significant contribution in welding cryogenic materials science. Steels, wires, elecrodes and fluxes created under his leadership were used in several larger space projects. He developed a new theory of weldability of materials and a classification of methods for joining materials depending on the state of aggregation of the substance. For the first time in world practice, materials and processes have been developed that allow welding metal with a superequilibrium nitrogen content of up to 1%. He performed a large cycle of work on welding ceramics and ceramics with metal. He was actively involved in the development of new materials and processes for surface treatment and coating which were successfully implemented in industry.

Konstantyn Yuschenko showed himself as a professional in developing PWI, in particular establishing PWI – IIW cooperation. He was the first representative of PWI to IIW.

He was the author of more than 800 scientific works published both in Ukraine and other countries, including seven monographs. He supervised seven doctoral dissertations and 42 PhD dissertations.

He received various awards for his achievements in science. He was the laureate of the State Prize of Ukraine in the Field of Science and Technology. He was awarded the Order of People’s Friendship, Order of Prince Yaroslav the Wise V rank, Order of Prince Yaroslav the Wise IV rank and many medals.

Our sincerest condolences to his family. His untimely demise is a great loss to all of us, and he will long be remembered.