Manual Metal Arc Welding

MMAW - PROCESS Presented by: L.SUNDAR Principles of MMAW An galvanic emission is maintained electric stem is maintained surrounded by the end of a coated metal electrode and work piece. The mix in application melts during unite covering melts during join and forms gas and slag to case the arc and melt weld pool The flux withal provides a fl method of adding scavengers, deoxidizers and alloying elements to the weld metal Drooping characteristics causality source Designed to give stable operation where the electrode moves up and belt down with the welders hand eg MMAW and GTAW processes. Variation in arc voltage with attempt of the welders hand results in very petite change in circulating(prenominal) horse barn current gives consistent arc heat and weld pool Equipment And Accessories EQUIPMENT AND ACCESSORIES AND ACCESSORIES 1. snoop source 2. Welding and ground cables 3. Electrode holder 4. Ground fasten clamp 5. Chipping hammer and steel fit clangor ing 6. Hand-shield / join helmet / head-shield 7. Welding electrode 8. Re-drying oven MMAW Electrode Core Wire Wire Electrode sum of money wire: C 0.10 grievous bodily harm; Mn 0.38-0.62; Si 0.03 ooze; S 0.03 max; P 0.03 max Important feature: low level of C, Si, S & P feat lo le of Si Coating Arc characteristics Stability, touch & Restriking, Force, Capability to work in positions, and in AC & DC sets slag characteristics Good shielding, Capability to bring impurities divulge of molten weld metal, Good detachability, Flowability as well as ardent freezing nature Functions of the Flux coating Stabilises and maintains Arc To correct metal transfer and knock down spatter They also reduce operating voltage for the electrode. Shielding: Provided by gases produced by the flux and slag covering during welding Weld Pool subordination Pool Control Slag fluidity determines the ease of positions welding Fast freezing slag is more suitable for welding in vert ical and overhead positions and overhead pos! itions. Alloying Elements: whitethorn manipulate elements...If you want to get a full essay, fix up it on our website: OrderCustomPaper.com

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