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一、焊接残余应力变形与前后处理焊接是将金属件连接的一种很方便的方法。但由于焊接时温度高易产生残余应力引起变形。如果要使焊接变形最小,就要设法减少残余应力,选择适当的焊接条件,使横收缩最小,残余应力和变形也最小。如: (1)焊接金属量尽量少: (2)焊接部位要限制到最少,适当选择焊着方法与焊接顺序; (3)要有转动操位器及胎架配合工作起来方便省力; (4)对构件应适当予热,使整个构件中的温度达到均衡。焊着金属量少是改善与减小焊接残余应力变形的基本方法,要适当选择坡口形式和焊缝形状。
First, the welding residual stress and deformation before and after welding is the metal parts connected to a very convenient method. However, due to high temperature welding prone to residual stress caused by deformation. If you want to minimize the welding distortion, we must try to reduce the residual stress, select the appropriate welding conditions, so that horizontal shrinkage minimum residual stress and deformation is also minimal. Such as: (1) the amount of welding metal as little as possible: (2) welding parts to be limited to a minimum, the appropriate choice of welding methods and welding sequence; (3) to have a rotary positioner and tire rack work together to facilitate labor-saving; ) The components should be properly preheated, so that the temperature of the entire component to achieve equilibrium. Weld metal less is to improve and reduce the residual stress of welding deformation of the basic method, the appropriate choice of groove form and weld shape.