| 摘要 |
PURPOSE:To form a weld zone which is high in toughness, low in tempering fragile susceptibility, and whose deposited metal has a beautiful appearance, by suppressing lowly O in a wire or flux, also adding positively N from one or both of them, and executing the titled welding. CONSTITUTION:In case of latent arc welding whose object is Cr-Mo low alloy steel, O content in a wire is requlated to <=0.01% and iron oxide in a flux is to <=0.4%. expressed in terms of FeO, respectively. On the other hand, 0.012- 0.040 N in the wire or <=0.040% N in the flux is prescribed, and also <=0.04% Al in the wire is prescribed. In this way, it is possible to form a beautiful deposited metal consisting of 0.07-0.13% C, 0.4-1.2% Mn, 0.07-0.40% Si, 0.5- 3.5% Cr, 0.3-1.5% Mo, <=0.009% Al, <=0.45% O, 0.012-0.040% N, <=0.2% Ni, and the balance Fe with inevitable impurites. |
