汽车柴油发动机(如东风6105柴油机)依靠曲轴与飞轮6只连接螺栓输出动力,螺栓被剪断时有发生。因螺栓紧固力矩大,且为不通孔,取出难度大。以往常用在断螺栓上打小孔的传统工艺,很难凑效,有时曲轴因此而报疲,造成损失。近来我们根据金属材料热胀冷缩原理,改用焊接方法,取得好的效果。现 Diesel engine (such as Dongfeng 6105 diesel engine) rely on the crankshaft and flywheel 6 bolts output power, the bolt has been cut off from time to time. Due to bolt fastening torque, and not through hole, remove the difficulty of large. In the past, the traditional technique of punching small holes on a broken bolt was hard to work with, and the crankshaft sometimes reported fatigue and caused losses. Recently, according to the principle of thermal expansion and contraction of metal materials, welding methods are used instead to obtain good results. Now