平均单位摩擦力基本上取决于切断压力焊接桥和克服耕犁阻力。
The mean unit force of friction to a great degree depends on shearing of pressure welding bridges and conquering of ploughing resistance.
轮子旋转时需要承受巨大的和不断变化的压力，所以要使结构更坚固，钢的部分要用螺栓连接，而不是焊接在一起。
The wheel would need to withstand immense and constantly changing stresses as it rotated, so to make the structure more robust, the steel sections were bolted rather than welded together.
它还包括应用于桥梁、管道、压力容器、汽车制造、造船以及焊接钢种等钢材。
It also includes application steels for Bridges, pipes, pressure vessels, automotive manufacturing, shipbuilding and welding steel grades.
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