| 摘要 |
PURPOSE:To obtain a welded joint having high toughness with the ferritic stainless steel having high Cr content as an object. CONSTITUTION:While a filler wire such as a power filler or a foil-like filler to satisfy the inequality I is supplied so that the quantity of Ni in weld metal to exceed 7weight%, laser beam welding is performed. Ni (weight%)-Creq>=24 (weight%) ... inequality I wherein Creq=%Cr+%Mo+1.5X%Si+0.5X%Nb (weight%). Accordingly, coarsening of crystal grains is prevented and a weld zone excellent in toughness can be obtained. Consequently, the rupture of the coil joining weld zone in line passing and subsequent lowering of productivity can be prevented. |
