| 摘要 |
PURPOSE:To prevent the deformation and fusion break of a fine metallic wire and to allow sure welding by dropping liquid to a part which is going to be welded prior to welding of the superposed part of a metallic support and the fine metallic wire by irradiation of this part with a laser beam. CONSTITUTION:The liquid, for example, water 5, is dropped to the superposed part, i.e., the part which is going to be welded, of the fine metallic wire 3 super posed on leads 2, 2. The water 5 extends to the part 3a parted from the part which is going to be welded along the fine wire 3 to wet a V shape groove 2a and the wound fine wire 3. The water 5 begins to evaporate from the posi tion 5a of a solid line when the part which is going to be welded is irradiated with the laser beam 6. The water 5 spreads thin in the upper part of the fine wire 3 in the position 5b. The side part and lower part of the fine wire 3 are pulled to a V-groove 2a by the viscosity and surface tension of the water 5. The fine wire 3 comes into tight contact with the leads 2 or maintains a slight spacing therefrom in the state of complete evaporation of the water 5. The sure welding is thus executed. The temp. rise is suppressed by the water 5 during the evaporation of the water 5. The deformation and fusion break of the fine metallic wire 3 are thus prevented. |
