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一、本文旨在通过以国产钛白粉代替T-50焊条中进口金红石试验研究探讨: 1.酸性钛型焊条渣系熔渣碱度对磷过渡的影响。试验结果表明:随着碱度增加,磷向焊缝中过渡确是减弱,但是随着渣系碱度进一步提高,焊接工艺性变坏。因此企图通过调整碱度达到降磷目的,实际行不通。 2.淀粉脱磷问题。试验结果表明:淀粉在焊接冶金过程中,脱磷作用及其脱磷机理值得探讨,淀粉对本渣系表现不出有脱磷效果。 3.减少配方中高磷物质,控制焊缝中磷的含量。①试验结果表明:随着涂料中钛白粉含量增加,焊肉中磷的含量亦相应增加。②减少涂料中原中碳锰铁数量,可以减少焊肉中含磷量。同时,又为了不降低焊肉中锰的含量,提出了几种提高锰元素过渡系数的冶金指施,如增加涂料中 MnO_2或适量地增加强脱氧剂——钛铁或矽铁。二、在上述试验基绌上,结合T-50焊条在高矽钢板上(含si>0.2％左右)抗气孔性不强,迸行了提高抗气孔能力的试验研究探讨; 1.探讨了T-50焊条在高矽钢板上产生气孔的机理,提出T-50焊条在高矽钢板上产生气孔的主要原因是氢气——即属于氢气孔。 2.比较了与T-50焊条同类型的国外钛型焊条在高矽钢板上不产生气孔的看法。指出了T-50焊条配方中木粉对提高抗气孔性不利。 3.试验了熔渣氧化性与抗气孔性之间的关系,试验结果表明,适量地提高熔渣氧化性可以消除气孔,提高工艺性。 4.已应用于实际生产的降磷措施及改进后的T-50焊条质量。①在原配方基础上,以钛铁矿代替四氧化三铁,适量提高长石含量,同时降低中碳锰铁含量,得到了工艺性和机械性能良好,且已用于生产的29~#配方,该配方唯一缺点是配方中仍含有一部份进口金红石。②提出了一种全部代替进口金红石的配方10~#。试验表明,当焊条芯含磷量较低时, 焊缝中含磷量符合要求,但在冶金过程中,磷的绝对过渡量仍偏高,工节性比 29~#配方稍差些,有待于进一步深入研究。
First, the purpose of this paper is to use domestic titanium dioxide instead of rutile T-50 imported rutile test research: 1. Acidic titanium electrode slag slag system alkalinity on phosphorus transition. The experimental results show that with the increase of alkalinity, the transition of phosphorus to the weld is indeed weakened, but as the alkalinity of the slag system further increases, the welding processability deteriorates. Therefore, attempts to achieve the purpose of reducing phosphorus by adjusting alkalinity actually do not work. Starch dephosphorization problems. The experimental results show that dephosphorization and dephosphorization mechanism of starch in welding metallurgy are worth discussing. Starch shows no dephosphorization effect on this slag system. 3. Reduce the formulation of high-phosphorus material, control the phosphorus content in the weld. ① The test results show that: with the increase of titanium dioxide content in the coating, the content of phosphorus in welding meat also increases accordingly. ② reduce the number of paint in the original carbon ferromanganese can reduce the amount of P in welding meat. At the same time, in order not to reduce the content of manganese in welding meat, several metallurgical measures to improve the transition coefficient of manganese have been put forward, such as increasing the amount of MnO_2 in coatings or increasing the amount of strong deoxidizer - ferrotitanium or ferrosilicon. Second, on the basis of the above test, in combination with T-50 electrode on the high-silicon steel (containing si> 0.2%) anti-porosity is not strong, conducted an experimental study to improve anti-stomatal ability; 1.T -50 electrode in the high-silicon steel to produce stomatal mechanism, proposed T-50 electrode in the high-silicon steel to produce stomatal mainly due to hydrogen - that is, belong to the hydrogen hole. 2. Compared with the T-50 electrode of the same type of foreign titanium electrode in high-silicon steel does not produce stomatal view. It is pointed out that the wood flour in T-50 electrode formula is unfavorable to improve the anti-porosity. Test the relationship between slag oxidation resistance and porosity, the test results show that, to increase the amount of slag oxidation can eliminate pores and improve the process. 4. The phosphorus reduction measures that have been applied to the actual production and the quality of the improved T-50 electrode. On the basis of the original formula, ilmenite instead of ferriferous oxide, appropriate amount of feldspar content, while reducing the content of carbon ferromanganese, obtained good technical and mechanical properties, and has been used in the production of 29 ~ # formula, The only disadvantage of the recipe is that the recipe still contains a portion of the imported rutile. ② put forward to replace all the imported rutile formula 10 ~ #. The experiment shows that when the content of phosphorus in the core is low, the content of phosphorus in the weld meets the requirement, but the absolute transition of phosphorus in the metallurgical process is still high, and the workability is slightly worse than that of the 29 ~ # formula. To further study.