Current passing through resistance electric welding - Manufacturing Processes - 1

Q.  In resistance electric welding, the current passed through two joining metal pieces is
- Published on 03 Aug 15

a. 230 to 440 volts, at a high amperage
b. 230 to 440 volts, at a low amperage
c. 2 to 8 volts, at a high amperage
d. 2 to 8 volts, at a low amperage

ANSWER: 2 to 8 volts, at a high amperage
 

    Discussion

  • Pankaj   -Posted on 02 Nov 15
    - In resistance electric welding, two metals are joined by pressing them together and passing a heavy electric current through them.

    - Fusion temperature is obtained by placing two metal surfaces in contact with each other and passing a current of 2 to 8 volts, at a high amperage through them.

    - Current is switched off to complete the welding.

    - The advantage of resistance electric welding is the rapid heating of the surface being welded due to high amperage current.

    - Successful operation of resistance electric welding depend upon correct application of welding current, welding pressure and contact area of electrodes.

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