| 摘要 |
PURPOSE:To enhance the properties of a weld zone, especially the toughness by welding a steel plate or an extrathick steel plate with electron beams and cooling the formed weld zone naturally or at a cooling rate above the natural cooling rate from the austenite range. CONSTITUTION:A steel plate or an extrathick steel plate is welded with electron beams, and the formed weld zone is heated to a temp. in the austenite range (the Ac3 point and above) within about 10min by high frequency induction heating or other method. The heated weld zone is kept at the temp. for a shoft time such as <= about 10min and cooled naturally or at a cooling rate above the natural cooling rate to ensure the original strength level as well as to improve the toughness. Whether the weld zone is cooled naturally or at a cooling rate above the natural cooling rate is decided by the size and structure of the weld zone. |
