Self-Shielded Flux-Cored Arc Welding
Self-shielded flux-cored welding is an arc welding process using a tubular flux-cored wire that forms gases and slag during combustion to shield the weld pool. This allows outdoor use without external gas supply.
Physicochemical Mechanism of Action
The flux-cored wire consists of a core material that releases gases and slag upon combustion. These form a natural protective layer over the weld pool that keeps oxygen out and also accelerates the welding process.
Metallurgical Relevance & Risks When Welding
Without external gas supply, the process is particularly prone to pore formation because the natural shielding is not always sufficient. Additionally, the flux-cored wire can cause uneven melting and cracking due to poor thermal conductivity.
Workshop Practice & Action Instructions
• Use high-quality flux-cored wire with good thermal conductivity.
• Make sure the wire is inserted correctly and the welding surface is clean.
• Ensure even burning of the flux-cored wire by adjusting the arc voltage and current.