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Laser welding uses light energy to rapidly heat the weld zone, melting the filler rod along with the work piece. This light energy intensity is controlled by beam size, voltage, pulse width, singularly or is repeated at variably timed intervals by the laser operator. A high intensity laser is used, allowing for no current to flow through the work piece. This allows for various tool steels and different alloys to be welded together. There are no electrical connections or current polarity effects to the weld or to the work piece with laser welding.