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# Arc welding machine

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it is based on arc welding .
what is concept behind welding
why in arc welding DC welding is good

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### Arc welding machine

1. 1. ARC Welding Machine<br />By- Anandpatel<br />Submitted to- Ajankyaphatak {HOD}<br />
2. 2. Today I am discussing about Arc welding.<br />We know Arc welding is two type <br />Then when I was studied welding .then infront of me some question.such as<br />Why?DC welding are used for all types of welding{thick or thin material}<br />Why AC welding machine are not .<br />
3. 3. AC welding{why does not weld alltype of joint}<br />Ac welding polarity are not fixed…<br />Due to polarity changes we cant use for all type of welding<br />
4. 4. DC welding machine{we use weld for thick materail}<br />Fixed polarity<br />With the help of fixed polarity.we can handle accoring to use thick or thin welding.<br />
5. 5. What is concept behind polarity<br />If work piece is connect with positive terminal and electrode are connected with negative terminal then this type of polarity..called “straight polarity”<br />
6. 6. REVERSE POLARITY<br />If work piece are connected with negative terminal and electrode are connected with positive terminal then this type of welding we called “Reverse welding”<br />
7. 7. How can work polarity<br />When we flow current in electrode and work piece .then electrode and work piece b/w magnetic field obtain.<br />
8. 8. Magnetic field <br />Then those magnetic field are set up b/w work piece and electrode .then due to magnetic field are some deflect in magnetic field direction.<br />These concept are use in forward and reverse welding.<br />When electrode are move in magnetic field direction .then we called forward welding. Due to this welding we weld very thick material.<br />When we move electrode in reverse dirction of magnetic field.then these type of welding we called revrse welding .due to this welding we can weld thin type of material.<br />
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10. 10. Thank u<br />