There is fire phenomenon in load.

①Check if there is a short circuit between the positive and negative poles on the load, and if there is, separate them, clean the place where is fired.

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②Check whether the positive and negative poles are too close to each other. The reasonable distance between the positive and negative poles should be more than twice the thickness of the workpiece.

③See if the edge of the positive electrode is too close to the rack. The distance of edge of the positive electrode to the rack should be more than twice the thickness of the workpiece.

④Check if there are any impurities in the insulation board, and if yes, clean them up.