there are many types of welding power sources, here are several types such as inverter, rectifier, transformer, generator welding machines.

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?
Almostalloftheweldingmachinesrequire electricity
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:
Welding machines 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?
Rectifier converts 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
20VDC poweroutput.Ithasaveryhighfrequency intherangeof
20,000HZ–100,000HZ
•
Lowpowerconsumption.
• Smallsizeandlightweight
• Providesuperiorcontroloftheelectricarc.
• Comeswithacoolingfantosafeguardthepartsfromheat.
• Multiprocessing(CC/CV)
• Expensiverepaircosts
• Lessdurable
• Lowdutycycle

8. What is generator?
Generator is 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).
Whereas AC-currentpowersuppliescanbe
only (CC).

11. Recommended Power
Source Output Type by Arc
Welding Process
Toutilizeasimplerdesignandkeeppurchasing
costslower,weldingpowersourcesaregenerally
designedtobeusedwithjustoneortwotypesof
weldingprocesses.Soabasicstickmachinewill
haveCCoutputonly,asitisintendedforstick
weldingonly.ATIGmachinewillalsohaveCC
outputonly,asitisintendedforTIGandstick
weldingonly.Conversely,abasicMIGmachinewill
haveCVoutputonly,asitisintendedforMIGandfluxcore
weldingonly

12. Any questions

13. Reference
The ABC’s of Arc 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).