Rutile flux cored wire
Rutile flux-cored wire: tubular filler metal with powdered rutile inside, offers high deposition rate and good gap bridging.
Physicochemical Mechanism of Action
The flux-cored wire consists of a tubular wire lined with a powdered filling based on rutile. The rutile (titanium dioxide) absorbs oxygen and prevents pore formation in the weld pool. The high deposition rate of the rutile powder ensures a uniform melt and improves gap bridging.
Metallurgical Relevance & Risks When Welding
Using rutile flux-cored wires reduces the formation of pores and increases the toughness of the weld. However, an excessively high rutile content (above 0.40%) can lead to embrittlement and impair strength. It is important to control the correct rutile content and melting time.
Workshop Practice & Action Instructions
• Use flux-cored wires with a rutile powder content of 0.25% to 0.35% for optimal results.
• Ensure the melting time is between 15 and 20 seconds to achieve uniform gap bridging.
• Monitor the temperature in the weld pool and note the correct cooling time (t8/5) of 10 to 15 seconds to avoid pore formation.