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The welding cycle of spot welding and projection welding consists of four basic stages

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1) pre-pressing stage -- the electrode drops to the current connection stage to ensure that the electrode presses the workpiece and there is appropriate pressure between the workpiece.


2) welding time -- the welding current passes through the workpiece and generates heat to form the core.


3) maintenance time -- the welding current is cut off and the electrode pressure continues to maintain until the nugget solidifies to sufficient strength.


4) rest time -- the electrode begins to lift until the electrode begins to drop again, starting the next welding cycle


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