| 摘要 |
PURPOSE:To obtain a welding rod which is excellent in erosion resistance, is hard to be weld-cracked by low yeild strength being less than 18-8 stainless steel, and excellent in workability, by providing the covering of a specific composition on a core wire which has specified Mn of Ni-Cr steel and has added Mo, Nb and Co. CONSTITUTION:A core wire is composed by containing 1 kind or more of <=0.2C, <=2 Si, 10-20 Cr, 0.5-10.2 Ni, <=20 Mn, <=2 Mo, 0.01-0.1 Nb and 0.5-5 Co, in wt%, respectively, and Fe substantially as the remainder. On the surface of this core wire, covering containing 35-45 CaCO3, 20-30 CaF2 and 35-48 TiO2 is provided. In this case, CaCO3 functions mainly for shielding the open air due to CO2 generated by a slag generating action and welding heat, requires the lower limit or above, and harms an arc phenomenon in case of excess. CaF2 is gasified easily by welding heat, shields the open air of glogules, its effect is insufficient in case of the lower limit or below, and its workability is harmed in case of excess. TiO2 mainly has a slag generating effect, its effect is insufficient in case of the lower limit or below, and in case of excess, its shielding effect is harmed. |
