农业机械的各个组成构件和零部件,大多由槽钢、工字钢、角钢、圆形钢管、方形钢管等型材和钢板焊接而成。在使用与维修过程中,由于振动、过载、疲劳或受外力冲击、撞击,往往会发生弯曲、凹陷塑性变形和脱焊开裂等现象,需要进行校正修复和焊接维修。 The components and parts of agricultural machinery components, mostly by the channel, I-beam, angle steel, circular steel pipe, square steel pipe and other profiles and steel welded together. In the process of using and maintenance, due to vibration, overload, fatigue or impact by external forces, impact, tend to occur bending, plastic deformation and desoldering cracking and other phenomena, the need for correction and repair and repair welding.