Arc welding types ( submerged & electro slag )

submerged arc welding, electro slag welding

1. YoucaN Submerged & Electro slag welding YoucaN Compiled by Pravinkumar Kamatchi St.Josephs College of Engineering Assistant Professor

2. Submerged arc welding YoucaN

3. Submerged arc welding YoucaN

4. Submerged arc welding YoucaN POWER SUPPLY Granular flux consisting of lime, silica, manganese oxide, calcium fluoride and other compounds In a single pass we can weld 25mm Used to weld: low carbon steels

5. Submerged Arc Welding Coalescence is produced by heating with an arc between a bare wire electrode and the work. Welding zone is shielded by a blanket of fusible granular flux material supplied directly on the weld seam. YoucaN

6. Submerged arc welding Pressure is not used. Electrode act as a filler metal. Electrode is copper-plated in outside surface(for electrical conductance) larger diameter electrodes are used. So in a single pass of welding a 25mm weld can be made. The flux acts as a thermal insulator by promoting deep penetration of heat into the workpiece. Suitable to weld straight welds in a flat position. Also suitable for circular shapes if the work piece is rotated under the welding head. YoucaN

7. Submerged arc welding Used to weld: low carbon steels, high strength low alloy steels, chromium steels. Applications: To weld large diameter pipes, boiler pressure vessels, railroad tank cars, structural members in ships and cylinders . Advantages: Joints can be prepared with a shallow V-groove, resulting in lesser electrode consumption. Wire electrode is inexpensive Weld spatters are eliminated Nearly 100% deposition is achieved. YoucaN

8. Submerged arc welding Disadvantages: It can not be used for plates less than 5mm thick. Flux is subjected to contamination that may cause weld porosity . Chlorine , Aluminium , Magnesium, Lead, Zinc can not be welded. Slag has to be removed continuously after it has melted in order to avoid entrapment between passes. YoucaN

9. video 7.submerge_arc_welding go to 1min 35 sec 8. Submerged_Arc_Welding rotary table YoucaN

10. Electro slag welding YoucaN

11. Electro slag welding YoucaN Water cooled Copper slide

12. Electro slag welding YoucaN

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14. YoucaN After switching on the power, due to the electron flow the spark melts the flux

15. YoucaN Due to that heat the molten slag forms. Slag resist the current flow, so it melts the electrode.

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18. Electro slag welding Electroslag Welding is initiated by an arc between the electrode and the work piece (or starting plate). Heat, generated by the arc, melts the fluxing powder and forms molten slag . Prior to welding the gap between the two work pieces is filled with a welding flux. The slag, having low electric conductivity, is maintained in liquid state due to heat produced by the electric current . Current is about 600A at 40 to 50V .(depends on “t”) YoucaN Flux consisting of lime, silica, manganese oxide, calcium fluoride and other compounds

19. Electro slag welding The slag reaches a temperature of about ( 1930°C). This temperature is sufficient for melting the consumable electrode and work piece edges. Metal droplets fall to the weld pool and join the work pieces . In the outer a water cooling circuit helps for quick solidification. YoucaN

20. Electro slag welding Used to join 50mm to more than 400mm thick plates . Travel speed is 12 to 36mm/min. Application: Used in large structural steel sections, such as heavy machinery, bridges, oil rings, ships and nuclear reactor vessels. YoucaN

21. video 7. electro slag welding YoucaN

22. Every thing is possible YoucaN