In order to develop a basic electrode with low fume and good usability, a new slag system has been designed after analyzing several basic electrode slag systems. Then in view of uniform design method, arranging the experiment points by it, the influenced laws of the new system coating components on the arc stability had been searched. In the formula, nine coating components were taken as independent variables and they were divided into six levels in all twenty-four experiments. The arc stability was taken as function and taken down the data when welding and then put them into the computer to be processed statistically. The analysis results give the mathematical model and trend diagrams between independent variables and the function. They indicate that the effects of many coating components on the arc stability are in the mutual form. The mutual effects between CaCO3 and BaF2, BaF2 and BaCO3, increases the arc stability separately. While the mutual effects between CaF2 and iron powder, the square item of iron powder itself decreases the arc stability separately.
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