抄録
The effectiveness of an inorganic coating to ensure the weldability of tufftrided steel is investigated by Co2 are welding, friction welding and tension test, using specimens of SM50A and S15CK steel partially protected from tufftriding by the coating. The results obtained are summarized as follows : (1) In the CO2 are welded joint, the tensile strength of the tufftrided steel after 90minutes was remarkably reduced due to porosity and lack of penetration. But the anti-tufftrided steel was as strong as the non-tufftrided steel regardless of tufftriding time. (2) The porosity of the tufftrided steel was influenced to a greater extent by the compound layer than by the diffusion layer. (3) Friction welding of the anti-tufftrided steel was fully possible under the same condition as was welding with non-tufftrided steel. However, in case of long time tufftrided steel it was difficult to establish welding conditions and ensure strength.
