Ni-Mo low alloy steel exhibits an admirable amalgamation of high strength and toughness at subzero temperature and show resistance to brittle fracture with good weldability. This steel has been established to fulfill the needs of specific applications, such as the construction of ships and submarines. To develop a companionable wire for welding of Ni-Mo low alloy steel, the amount of the alloying elements in a wire is increased to toughen of weld metal, the wire itself has high strength so that the wire is hardened at the wire drawing, making the wire production difficult. In order to avoid the problems related to the solid wires, various flux cored wires have been developed. In this work, the effect of flux basicity index and heat input on chemical composition, oxygen-nitrogen analysis, mechanical properties and microstructure of Ni-Mo low alloy steel welded by SAW welding using flux cored wires are presented along with the effect of flux cored wire and basicity index on deposition rate.

Ni-Mo低合金钢在低于零温度的条件下表现出令人称赞的高强度和韧性的融合，并表现出对脆性断裂的抵抗力以及良好的可焊接性。建立这种钢是为了满足特定应用的需求，例如建造船舶和潜艇。为了开发用于Ni-Mo低合金钢焊接的配套焊丝，增加焊丝中的合金元素含量以使焊缝金属增韧，焊丝本身具有高强度，从而使焊丝在拉丝时硬化，从而电线生产困难。为了避免与实心线有关的问题，已经开发了各种药芯焊丝。在这项工作中，助焊剂碱性指数和热量输入对化学成分，氧氮分析，