| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a welded composite member excellent in impact resistance and its welding method. SOLUTION: Two members made of iron, at least either of which is spheroidal graphite cast iron member, are welded. At this time, from directly after welding at the latest, the vicinities of respective weld zones of both members made of iron are put into heated state and the cooling rate at the A1 transformation point in the weld zone of the spheroidal graphite cast iron member is regulated to <=40 deg.C/sec. By this method, the welded composite member, in which the content of the chill phases in the structure of the boundary layer of welding of the spheroidal praphite cast iron member is regulated to <=10%, can be obtained.</p> |
