There is provided an improved TIG welder comprising a power source for performing an AC TIG welding process across an electrode and a workpiece with a controller for creating an AC waveform. The work light includes a housing that houses a light source, a light homogenizer and an imaging lens in an operational relationship. The barcode label affixed to any tray is scanned by the route driver. Further, the first suspension has outer fixed portions disposed at the distal end portions of the leaf spring portions and secured to the upper end surface of a weight of the magnetic circuit assembly. Ring gears of gearsets respectively form shafts. 5\xb0, where the gloss R60\xb0 of the backing layer is smaller than or equal to 70.