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This is to certify that your paper entitled «Experimental and numerical investigation of the effects of preheating temperature on cutting force, chip shape and surface roughness in hot turning of AISI۶۳۰ hardened stainless steel» was indexed with 14 pages, in the CIVILICA citation database, code COI:JR_EES-9-2_004, after evaluation and approval of the referees of the "Energy Equipment and Systems Vol 9, Issue 2 , Year 2021.

While offering our congratulations on the indexation of your paper, please be informed that this certificate is prepared based on the information submitted by the secretariat of the above journal and the information contained in the CIVILICA database, and the accuracy of its content can be inquired at any time through link provided at the bottom of the page or scanning the code image.