| 摘要 |
PURPOSE: A resistance spot welding machine indicating a welding spot is provided to always and uniformly match the center portion of the upper surface of a specimen, which is the welding spot, with the axis line of a lower electrode at the upper end of the lower electrode according to the thickness of the specimen, and to vary the position of a light irradiating part, which is placed on the upper side of the side of the lower electrode, on the basis of the center axis of the electrode as a rotation center so that an optimal position for irradiating the light can be set. CONSTITUTION: A resistance spot welding machine includes a main body(100), electrodes(210,220), a light irradiating part(300), and a variable controlling part. The electrodes are installed at the main body, and follow an axis line up and down. The light irradiating part is installed at the main body, receives an electric signal from outside, and then irradiates a light on the electrodes. The light irradiating part is a laser pointer which is placed on the upper side of the side of the electrodes. The light irradiating part includes a light irradiator, which is placed on the upper side of one side of the electrodes and irradiates the light on the upper side of the electrodes, and an optical receiver, which is placed on the upper side of the other side of the electrodes and receives the light reflected from the upper side of the electrodes. The variable controlling part is installed at the main body, and varies the irradiating position of the light irradiating part according to the thickness of a specimen settled on the electrodes. The variable controlling part includes a rotational angle adjuster and a controller. The rotational angle adjuster is installed at the main body, receives the electric signal from outside, and then adjusts the rotational angle of the light irradiating part up and down. The controller is electrically connected to the rotational angle adjuster, and controls the operation of the rotational angle adjuster with the rotational angle which is predetermined according to the thickness of the specimen.
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