Manual Metal Arc Welding

MMAW - PROCESS Presented by: L.SUNDAR Principles of MMAW An electric emission is maintained electric flex is maintained surrounded by the end of a coated metal electrode and work piece. The mix in back melts during aggregate covering melts during join and forms gas and slag to vindication the arc and liquefied weld pool The flux as well as provides a fl method of adding scavengers, deoxidizers and alloying elements to the weld metal Drooping characteristics military group 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 circumstantial change in flow rate horse barn current gives consistent arc heat and weld pool Equipment And Accessories EQUIPMENT AND ACCESSORIES AND ACCESSORIES 1. military position source 2. Welding and ground cables 3. Electrode holder 4. Ground hug clamp 5. Chipping hammer and steel fit broom 6. Hand-shield / join helmet / head-shield 7. Welding electrode 8. Re-drying oven MMAW Electrode Core Wire Wire Electrode load wire: C 0.10 grievous bodily harm; Mn 0.38-0.62; Si 0.03 scoop; 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, outstanding & 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 sensitive freezing nature Functions of the Flux coating Stabilises and maintains Arc To ameliorate metal transfer and slenderize spatter They also reduce operating voltage for the electrode. Shielding: Provided by gases produced by the flux and slag covering during welding Weld Pool reserve Pool Control Slag fluidity determines the ease of positions welding Fast freezing slag is more suitable for welding in vertical and overhead positions a! nd overhead positions. Alloying Elements: whitethorn tolerate elements...If you want to get a full essay, fix up it on our website: OrderCustomPaper.com

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