| 摘要 |
PURPOSE:To stabilize welding workability and to improve the toughness of molten metal in MIG arc welding by using a wire added with rare earth elements and performing DC positive polarity welding in an inert gas mixed with an active gas. CONSTITUTION:In the stage of performing MIG arc welding by using a welding wire contained with 0.02-0.30wt% rare eaeth elements as an arc component improving element, the polarity of the arc is made DC positive. An active gas such as 2-18% CO2 or 0.7-6.0% O2 is mixed with the inert gas to be used for an enclosing atmosphere. According to this method, the amt. of oxygen in weld metal can be set at an adequate value. The generation of blowholes or the like is completely eliminated in an arc stabilization effect coupled with a deoxidation effect. |
