Sulfur impurities in the weld metal and phosphorus on the performance of welded joints have a greater impact, and thus in some important engineering structures you want to be limited [1,2]. The weld metal in manual arc welding of sulfur, phosphorus, mainly from the skin of steel and Welding Electrode Supplier rod drugs, drugs in the welding process, electrode melting occurs when the skin will affect the weld metal metallurgical reactions of sulfur and phosphorus content. To this end, study the alkalinity of the skin electrodes drug desulfurization, dephosphorization behavior, with a view to the skin electrodes drug formulations designed to provide information.

Test material and methods

1.1 Test Materials
Selection of welding core of H08A φ4 mm steel core, and its chemical composition (mass fraction,%) were: C 0.07, Si 0.017, Mn 0.44, S 0.018, P 0.01. Use of alkaline hydrogen from low alkalinity slag pressed into different welding electrode to communicate test electrode diameter of 6.4 mm.

1.2 Test Method
AC arc welding by hand, welding speed of 170 mm / min or so, the Mig Welding Electrode current of 175 ~ 185 A, arc voltage of 21 ~ 25 V. Deposited metal and slag sulfur, phosphorus analysis using conventional methods. Skin electrodes drug alkalinity (alkalinity are involved in this article refers to the alkalinity of the skin electrode drugs) by the International Institute of Welding (IIW) formula recommended B1 alkalinity.

2 results

Electrode in order to obtain basicity of the sulfur deposited metal and phosphorus content of the laws affecting the use basicity of different electrode welding tests carried out, analysis of the deposited metal in the slag and sulfur, phosphorus, and Accordingly derived sulfur and phosphorus in the slag and the deposited metal distribution coefficients in Table 1. Table Ls, Lp [Ls = w2 (S) / w1 (S), Lp = w2 (P) / w21 (P)] are the sulfur and phosphorus in the slag - molten iron in the distribution coefficient, w1, w2, respectively, on behalf of a elements in the deposited metal and slag mass fraction.

3.1 basicity electrode on the desulfurization behavior
The data in Table 1 can be made basicity electrode B1 and Ls and w1 (S) value of the relationship between the curves. , Ls with the basicity of the electrode increases, but when alkalinity reaches a certain value, Ls worse. Sulfur content of deposited metal variation just the opposite, and can be seen in the experimental conditions, by changing the electrode method of basicity to desulfurization is limited.