A kind of automatic welding machine and its microcomputer control system were designed in this paper. The mechanical system includes a floating welding workbench, the two-dimension mechanism and the indexing mechanism. There are two choices for the control system, based on PLC or IPC separately. The automatic welding machine can be applied to train hook buildup welding. Experiments showed that reasonable buildup welding was achieved, and the automatic buildup welding equipment can improve productivity and work conditions.
At present the wear and friction of pantograph-contact line is studied widely, while the research of the run-in process is little. In the paper they are obtained that the contact area is 0.96mm2, contact stress is 73MPa, current density is 520A/mm2, the contact resistance is 0.01583 and the contact temperature is 2797K on the surface of slide during the run-in period by the theory calculation. The high temperature of slide surface leads to the oxidation damage. While the carbon film comes into being and the friction surface is tending towards stability.
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