The mechanical noise of automatic welding is caused by the vibration or mutual impact of various mechanical components excited by external force. The main methods of controlling mechanical noise are:

提高旋转运动部件的平衡精度，减少旋转运动部件的周期性激发力；在固体零部件接触面上，增加特性阻抗不同的弹性材料，减少固体传声；在振动较大的零部件上安装减振器，以隔离振动，减少噪声传递；采用内损耗系数较高的材料制作机械设备中噪声较大的零部件，或在振动部件的表面附加阻尼，降低其声辐射效率；

Improve the balance accuracy of rotating parts and reduce the periodic excitation force of rotating parts; On the contact surface of solid parts, elastic materials with different characteristic impedance are added to reduce solid sound transmission; Install shock absorber on parts with large vibration to isolate vibration and reduce noise transmission; Use materials with high internal loss coefficient to make noisy parts in mechanical equipment, or add damping on the surface of vibrating parts to reduce their sound radiation efficiency;

提高运动部件的加工精度和光洁度，选择合适的工差配合，控制运动部件之间的间隙大小，降低运动部件的振动振幅，采取足够的润滑减少摩擦力；避免运动部件的冲击和碰撞，降低撞击部件之间的撞击力和速度，延长撞击部件之间的撞击时间；用焊接代替铆接，用滚压机和风压机矫正钢板代替敲打，用无声液压或挤压代替冲压，可用压力机代替锻锤。

Improve the machining accuracy and finish of moving parts, select appropriate work difference cooperation, control the gap between moving parts, reduce the vibration amplitude of moving parts, and take sufficient lubrication to reduce friction; Avoid the impact and collision of moving parts, reduce the impact force and speed between impact parts, and prolong the impact time between impact parts; Welding is used instead of riveting, rolling machine and air compressor are used to correct the steel plate instead of knocking, silent hydraulic or extrusion is used instead of stamping, and press can be used instead of forging hammer.

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