Arc Welding Ppt Work [2021] - Flux Cored
Flux Cored Arc Welding (FCAW) is an electric arc welding process that uses a continuously fed consumable tubular wire electrode containing a granular flux. It is primarily used for joining ferrous metals like mild and stainless steel. How FCAW Works
Arc Initiation: An electric arc is established between the continuously fed wire electrode and the base metal workpiece.
Melting & Shielding: The intense heat of the arc melts both the tubular wire and the base metal. As the flux inside the wire melts, it releases shielding gases to protect the molten weld pool from atmospheric contaminants like oxygen and nitrogen. flux cored arc welding ppt work
Slag Formation: The melted flux also forms a protective layer of slag on top of the weld bead, which helps shape the weld and protects it while it cools.
Deposition: As the electrode is consumed, it adds filler metal to the joint, allowing for high deposition rates. Types of FCAW Flux Cored Arc Welding (FCAW) is an electric
Self-Shielded (FCAW-S): Relies entirely on the flux core to generate its own shielding gas. It is highly portable and ideal for outdoor use where wind might blow away external gas.
Gas-Shielded (FCAW-G): Also known as "Dual Shield," it uses an external shielding gas (often CO₂ or an Argon/CO₂ blend) in addition to the flux. This produces cleaner welds with better mechanical properties and is typically used for indoor fabrication on thicker materials. Key Advantages & Disadvantages Visual: Long, worm-like holes in the slag or weld surface
1. Embed Short Video Loops
Stop describing the flux core. Show it. Embed a 10-second clip of the flux bulging out the end of the wire before the arc melts it. This visual of the "wire within a wire" is your "aha!" moment.
2. Worm Tracking (Gas Trails)
- Visual: Long, worm-like holes in the slag or weld surface.
- Cause: Voltage is too low, trapping gas generated by the flux underneath the slag.
Types of FCAW
- FCAW-S (self-shielded): No external gas; flux generates shielding gases. Good for outdoor, windy conditions and fieldwork.
- FCAW-G (gas-shielded or dual-shielded): Uses external shielding gas (often CO2 or argon/CO2 mixes) plus flux; produces cleaner welds with less smoke and spatter.
Slide 5 — Flux-Cored Wire Types
- Rutile flux: good arc stability, smooth beads, easier handling.
- Basic (low-hydrogen) flux: higher toughness, lower hydrogen pickup — preferred for critical structures.
- Solid wire vs. flux-cored: FCAW provides deeper penetration and higher deposition rates.