| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a laser welding method for preventing the occurrence of porosities in weld metal in laser-welding for steel, particularly, the one having low contents of Si and Mn. SOLUTION: Si and Mn are added to a laser irradiation part. In particular, a filler material containing Si and Mn is fed so that, with an amount Asi as for Si and an amount Amn as for Mn prescribed by an equation, Asi is controlled in <0.015 mass% and Amn is controlled in 0.45 to 0.8 mass%, or Asi is controlled in 0.015 to 0.02 mass% and Amn is controlled is >=0.36 mass% by using shielding gas in which carbon dioxide is mixed in 70 to 100% by a volume ratio.</p> |
