Hoverer there is a problem: Some materials can be problematical to weld, those with a high melting point and and differences in physical properties such as molybdenum, tantalum, tungsten. The photo shows a significant difference with melting between tungsten and steel.
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Uploaded a work by Beata Skowro ´nska 1,*, Mariusz Bober, Paweł Kołodziejczak, Michał Baranowski, Mirosław Kozłowski, Tomasz Chmielewski from https://www.mdpi.com/2076-3417/12/18/9034, Solid-State Rotary Friction-Welded Tungsten and Mild Steel Joints with UploadWizard