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![Comparison between AC &
DC welding machines
[SMAW, TIG,SAW] canperformon AC machines
[SMAW, TIG,SAW] canperform on DC machines](https://image.slidesharecdn.com/weldingpowersources-211118182657/85/Welding-power-sources-9-320.jpg)
Welding power sources
- 1. Weldingpower sources& accessoriesof AC & DC PREPAREDBY:MAHDI KARIM. ERBIL TECHNICAL ENGINEERING COLEGE lecturer: assist. Prof. Dr .Gailan Ismail hassan Welding technology
- 2. OBJECTIVES • Identifycurrenttypes. • Classifyweldingpowersources. •Comparisonbetweenpowersources. • Limitations. 2
- 3. What is current? Almostalloftheweldingmachinesrequireelectricity Electriccurrentmaybeeither: • AC • DC Currentistheflowofelectricalchargecarriers,
- 4. WELDING POWER SOURCES GENERATED POWER AC GENERATOR DC GENERATOR STATICS POWER TRANSFORME R AC RECTIFIER AC/DC DC INVERTER AC DC Welding power sources: Weldingmachines range from small types to large industrial types. • AC – maximum OCV* 80 V • DC – maximum OCV 110 V Welding machines: There are various types of welding machines available to accommodate the wide range of welding processes OCV* Open circuit voltages constant current CC constant voltage CV
- 5. What is Transformer? •Simple to use • High duty cycle • Inexpensive • Indestructible • Dangerous • Not practical for heavy industrial use • Not multiprocessing (only CC) Transformer is a device that transfer electric energy from AC circuit to one or more circuits. Welding transformer is used in AC machines to change alternating current from the power line into low voltage .
- 6. What is rectifier? Rectifierconverts AC to DC Flow electric only in one direction • High efficiency • Multiprocessing (both CC/CV) • Practical for industrial use • Single phase and three phase output • Safe • Large and heavy • Expensive • Not as simple as transformer
- 7. What is inverter? Aninverterweldingmachineconvertsalternatecurrenttoalower usablevoltageoutput.Forinstance,from240VACpowersupplyto 20VDCpoweroutput.Ithasaveryhighfrequency intherangeof 20,000HZ–100,000HZ • Lowpowerconsumption. • Smallsizeandlightweight • Providesuperiorcontroloftheelectricarc. • Comeswithacoolingfantosafeguardthepartsfromheat. • Multiprocessing(CC/CV) • Expensiverepaircosts • Lessdurable • Lowdutycycle
- 8. What is generator? Generatoris what creates electricity, it could be AC generator or DC generator . • Powerful • Most durable • Conduct electricity • Multiprocessing (CC/CV) • Heavy and big • Extremely expensive to purchase • Dangerous • requires fuel hence costs more
- 9. Comparison between AC& DC welding machines [SMAW, TIG,SAW] canperformon AC machines [SMAW, TIG,SAW] canperform on DC machines
- 10. CC & CV Direct-current(DC)powersuppliescanbe constant-voltage(CV)orconstant-current (CC). WhereasAC-currentpowersuppliescanbe only (CC).
- 11. Recommended Power Source OutputType by Arc Welding Process Toutilizeasimplerdesignandkeeppurchasing costslower,weldingpowersourcesaregenerally designedtobeusedwithjustoneortwotypesof weldingprocesses.Soabasicstickmachinewill haveCCoutputonly,asitisintendedforstick weldingonly.ATIGmachinewillalsohaveCC outputonly,asitisintendedforTIGandstick weldingonly.Conversely,abasicMIGmachinewill haveCVoutputonly,asitisintendedforMIGandfluxcore weldingonly
- 12.
- 13. Reference The ABC’s ofArc Welding and Inspection -- KOBE steel ,LTD / book BASIC MANUAL ARC METAL WELDING (MMAW) - ENG722 / book https://weldingtroop.com/advantages-of-an-inverter-welder/ John H. welding power/ 2016, June /https://www.weldclass.com.au/blog/36- what-is-an-inverter-welder-about-inverter-technology-and- welding#:~:text=An%20inverter%20works%20by%20increasing,1%20millionth% 20of%20a%20second).