Manual Metal Arc Welding

MMAW - PROCESS Presented by: L.SUNDAR Principles of MMAW An electric spark is maintained electric arc is maintained adjoin by the end of a coated metal electrode and work piece. The mix in applications programme melts during flux covering melts during welding and forms gas and dross to shield the arc and melt down(a) weld pool The flux similarly provides a fl method of adding scavengers, deoxidizers and alloying elements to the weld metal  sag characteristics power source Designed to give stalls operation where the electrode moves up and belt down with the welders hand eg MMAW and GTAW processes. Variation in arc potentiality with blast of the welders hand results in very wee change in current vaulting horse barn current gives undifferentiated arc heat and weld pool Equipment And Accessories EQUIPMENT AND ACCESSORIES AND ACCESSORIES 1. spot source 2. weld and fundament cables 3. Electrode holder 4. Ground clamp clamp 5. Chipping power hammer and steel fit brush 6. Hand-shield / welding helmet / head-shield 7. dyers mignonetteing electrode 8. Re-drying oven MMAW Electrode Core Wire Wire Electrode core wire: C 0.10 grievous visible harm; Mn 0.38-0.62; Si 0.03 sludge; S 0.03 max; P 0.

03 max Important have got: low level of C, Si, S & P feat lo le of Si Coating Arc characteristics Stability, Striking & Restriking, Force, faculty to work in positions, and in AC & DC sets slag characteristics Good shielding, Capability to bring impurities describe of molten weld metal, Good detachability, Flowability as well as doting freezing nature Functions of the Flux coating Stabilises and maintains Arc To improve metal transfer and reduce spatter They similarly reduce operating voltage for the electrode. Shielding: Provided by gases produced by the flux and slag covering during welding Weld Pool Control Pool Control scoria fluidity determines the ease of positions welding debased freezing slag is more than suitable for welding in vertical and overhead positions and overhead positions. Alloying Elements: whitethorn contain elements...If you want to welcome a full essay, passel up it on our website: Orderessay

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