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以热压糟钢拼焊的矩形管作汽车轮轴轴体的方轴，得到越来越广泛的应用。方轴结构类型很多，但以圆一圆结构形式过渡的对接方轴更具有独到的优点。
To hot pressing steel welding rectangular tube for the car axle shaft axis, get more and more widely used. There are many types of square shaft structures, but the butt-joint square shaft with round-and-circular structure transition has more unique advantages.