| 摘要 |
PURPOSE:To form weld bead without defect of blowhole, etc., by fitting ultrasonic exciting tip to a material to be welded at the time of arc-welding the metal material and exciting the ultrasonic vibration to the molten metal for weld bead. CONSTITUTION:At the time of welding the work 22 for welding material with arc welding, etc., the ultrasonic exciting tips 23, 24, 25, 26 are brought into contact with the surface of the work 22 near the weld bead 27 as inserting the bead 27 and the work 22 is welded with the welding torch 21 while applying the ultrasonic vibration from an ultrasonic exciting source 29. A weld metal pool 28 is forcedly vibrated and the weld bead 27 is uniformly solidified and cooled to depth direction and the uniformly fine weld bead depth direction and the uniformly fine weld bead 27 without defect of blowhole, weld crack, etc., is formed.
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