研制了用单片机组成的点焊控制箱，可完成三阶段加热焊接循环，实现预热、回火等。
A controlling box is developed using with 8031 single chip microprocessor. It can provides the controlling for 3 stages of heating of welding cycle, preheating and tempering etc.
微量V可提高高温回火后的强度，但降低塑性，应避免加入。
Microalloy element V should be avoided adding , although it improves the strength at elevated tempering temperature , but reduces the ductility .
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