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Submerged arc welding
Submerged arc welding is an arc welding process where the arc and molten metal are protected from atmospheric contamination by a blanket of granular flux. The flux covers the weld area and shields it, preventing spatter and suppressing ultraviolet radiation and fumes. The flux also acts as a thermal insulator to promote deeper penetration. The process uses a consumable bare wire electrode and can achieve very high welding speeds while allowing the operator to work without safety equipment. However, it is limited to flat and horizontal positions and requires slag removal after welding.
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Introduction to Submerged Arc Welding process and its categorization within welding methods.
The weld arc is shielded by granular flux that prevents spatter, protects against UV radiation, and acts as a thermal insulator.
Details on consumable electrode specifications, electrical current parameters, and operational limitations under various positions.
Advantages include high welding speeds and ease of operation. Disadvantages highlight positional limitations and contamination risks.
Key applications of Submerged Arc Welding include construction elements like penstocks and boilers.
Opportunity for questions and concluding remarks to thank the audience.
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Submerged arc welding
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- 3. Welding Process • Oxy-fuelGas Welding …….. …….. …….. • Arc Welding Submerged Arc Welding …….. …….. • Resistance Welding …….. …….. …….. • Solid State Welding …….. …….. ……..
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- 6. In Submerged ArcWelding….. • Weld arc is shielded by granular flux, consisting of lime, manganese oxide, calcium fluoride, silica and other compounds. • It prevents spatter and sparks and suppresses the intense ultraviolet radiation and fumes. • Flux also act as a thermal insulator promoting deeper penetration of heat into the workpiece.
- 7. • Consumable electrodeis a coil of bare round wire 1.5mm – 10mm in diameter. • Electrical current typically range between 300A to 3000A with AC single or three phase. • Limitations • Operation can be performed only in FLAT and HORIZONTAL positions. • But circular welds can be made on pipes and cylinders provided that they are rotating the welding.
- 8. • Advantages Veryhigh welding speeds can be achieved. Operator can easily work without any safety equipment. Easily achieve High metal deposition rate. • Disadvantages Operation can be performed only flat and horizontal position. Flux can get contaminated and lead to porosity in weld. An additional follow-up operation of slag removal has to be performed.
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