Residual stress remains in welds of the mining flameproof electrical switchgear stress after welding, and the shape of the workpiece is always changed after annealing.

• 矿用防爆电气开关中的焊接件,焊后存在残余应力,经退火处理后,常发生变形问题,通过调研、试验和应用证明:振动时效是消除和均化残余应力,防止变形的有效方法。