| 摘要 |
PURPOSE:To fill perforated holes thoroughly with molten metal and to prevent the formation of blowholes by subjecting iron and steel materials to be welded to laser welding by using shielding gases consisting of inert gases mixed with suitable amts. of active gases according to the kinds of said materials. CONSTITUTION:Iron and steel materials to be welded are subjected to laser welding by using shielding gases consisting of inert gases such as argon and helium mixed with suitable amts. of active gases such as oxygen, nitrogen and carbon dioxide according to the kinds of said materials. For example, if the materials to be welded are carbon steel, low alloy steel, high tensile steel, martensitic stainless steel and ferritic stainless steel, the shielding gases consisting of the compsns. of TableIare used. If the materials to be used are austenitic stainless steel, the shielding gases consisting of the compsns. of Table II are used. Thus the formation of babbles in molten metal is prevented in welding. |
