石油钻杆的接头与杆体摩擦焊接后要进行淬火热处理 ,多采用气雾为冷却介质提高焊缝区的冲击韧性 .根据钻杆焊缝局部气雾淬火的特点 ,选取合理的数学模型 ,用有限元方法计算了淬火过程中温度场的变化规律 .计算中对相变焓进行了等效热容法处理 .在生产现场对钻杆焊缝进行喷雾淬火 ,处理的结果符合实际生产需要 After the oil drill joint and the friction stir welding, the quenching heat treatment should be carried out, and the impact toughness of the weld zone should be improved by using the gas mist as the cooling medium.According to the characteristics of the local aerosol quenching of the drill joint, a reasonable mathematical model is selected, Element method was used to calculate the change law of the temperature field during the quenching process, and the enthalpy of phase transition was treated by the equivalent heat capacity method in the calculation.At the production site, the welding seam of the drill pipe was spray-quenched and the result of the treatment was in line with the actual production needs