Thursday, 7 May 2015

Magnetic Pinch Force in Welding

Pinch force plays main role in plasma enhancing. Flow of current through the arc gap develops the electro-magnetic field. Interaction of this EM field with charge carriers produces a force which tends to pinch the drop hanging at the tip of the electrode also called pinch force.

It acts at certain angle. It has two components. Role of horizontal component in case solid electrode is limited to the cutting of throat of drop only.
In case of tubular electrode, hollow tube contain gases only. When this horizontal pinch force acts on the tip of electrode then it produces a extra thrust on the drop. For better understanding, we can take the analogy. When we press the tube of tooth paste , paste comes out. The velocity of paste depends on intensity of applied force. Same situation is here.

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