| 摘要 |
PURPOSE:To obtain an excellent welded joint having no variance in its quality, by prescribing a proper content range of an element having a strong affinity to oxygen, in case of high efficiency full attitude TIG welding of cryogenic steel. CONSTITUTION:Ni is a main component of an alloy, and is required by 65% or more in order to maintain strength of a welded part by stable austenite tissue. Also, this high efficiency TIG welding material for cryogenic steel contains 10-25% Mo, <=0.15% C, <=0.5% Si and <=2% Mn, also contains so that a total of 1 kind or 2 kinds or more of 0.01-1.5% Al, 0.01-1.5% Ti, 0.01-1.5% Mg and 0.01-1.5% Zr becomes within the range of 0.01-1.5%, and consists of the balance Fe and some inevitable impurities. |
