This paper discusses the development of matching filler metals for new creep-resistant steels (P911 and P92) that enable higher operating temperatures (600-625 °C) in fossil fuel power plants, improving efficiency. The filler metals were evaluated with long-term testing (up to 30,000 hours) confirming their suitability for welded components in power stations. This development benefits not only power plant operators by reducing maintenance costs and downtime, but also builders, suppliers, and inspection bodies by providing a reliable solution for high-temperature applications. Additionally, matching filler metals developed for VM12 (12% Cr) martensitic steel are discussed.

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