| 摘要 |
A friction/stirring joining method for joining steel plates to one another, wherein a heating device (4) positioned to the front in the direction of travel of a rotating tool pre-heats a section to be joined prior to joining thereof by the rotating tool (10), and when doing so, the surface temperature distribution in the direction perpendicular to the direction of travel at the position at which the joining by the rotating tool (10) starts is set in a manner such that given that TAc1 serves as the Ac1 point of a steel plate, then the maximum temperature (TU) is in the range of 0.6×TAc1<TU<1.8×TAc1, and given that L is the width of the heating region above temperature (TL)=0.6×TAc1, then the relationship 0.3×d≤L≤2.0×d is satisfied for the shoulder section diameter (d). As a result, it is possible to improve joint strength while operating at a high joining speed, without any risk of joining failures or joining-tool breakage, and without any risk of temper softening or embrittlement from curing in the heat-affected areas. |
