关键词: 随焊冲击旋转挤压, 冷裂纹, 残余应力, 曲面冲击头

Abstract: Weld cold cracks of 40Cr under the conditions of strong constraint degrees were controlled by the method of welding with impact revolution. In order to increase the plastic deformations of the action zones, the geometrical shapes of the impacting rod were designed to curved shapes. The residual stresses of the workpieces with and without the impact revolution effect were measured. The distances between the welding torch and impacting rod were as 80mm, 100mm and 110mm respectively. The residual stresses at the joints were measured by small hole method. The experimental results show that the residual stress may be reduced by the method. The new method may prove the possibility on preventing weld cold cracks by reducing residual stresses.

Key words: welding with impact revolution, cold crack, residual stress;curved surface impact rod