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In arc welding arc is created between the electrode and work by
  • a)
    Flow of current
  • b)
    Voltage
  • c)
    Material characteristics
  • d)
    Contact resistance
Correct answer is option 'D'. Can you explain this answer?
Most Upvoted Answer
In arc welding arc is created between the electrode and work bya)Flow ...
Explanation:

  • Arc welding is a process of joining metals by producing an electric arc between the electrode and the workpiece.

  • The arc is created by the flow of current through the electrode and the workpiece.

  • However, it is the contact resistance between the electrode and the workpiece that initiates the arc.

  • When the electrode comes in contact with the workpiece, the contact resistance is high due to the presence of surface oxide films and other contaminants.

  • This high resistance causes a localized heating effect, which vaporizes the surface material and creates a small cavity or pit.

  • As the electrode is slowly withdrawn from the workpiece, the cavity is filled with molten metal, which solidifies to form the weld bead.


Conclusion:

  • Thus, it is the contact resistance between the electrode and the workpiece that initiates the arc in arc welding.

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