Abstract : with the aids of computer ' s hardware , executive mechanism of weld arc length automatic controller of all - position pipe welder and additional software , an automatic system for arc striking has been developed , in which touch - starting method using tiny current is introduced . utilizing this method , the ablation ratio of tungsten electrode and tungsten inclusion ratio of welded seam is far smaller than normal touch - starting method . and the successful ratio of arc striking is high 文摘:用全位置自动焊管机弧长自动控制系统的计算机硬件和执行机构，仅增加部分程序，设计了采用小电流接触引弧法的自动引弧系统，钨极烧损和焊缝夹钨远小于普通的接触引弧方式，引弧成功率很高。
In this paper , cuw / crcu integrated contacts with 50 % , 60 % , 70 % and 80 % tungsten by weight were prepared by verticat integrated sintering and infiltration technique , and the arc eroding and invalidation mechanism of contacts were analyzed in detail , the results were shown as following : the mechanism of arc eroding for cuw / crcu integrated contact is different with the content of w . 1 采用立式烧结熔渗工艺分别制备了cuw60 crcu ， cuw70 crcu ， cuw80 crcu整体触头材料，并分析了他们的烧损机理；同时，还对型式试验中触头的失效机理进行了分析，并提出改进措施。结果如下：不同成分的cuw电触头的烧损机理是不同的。
If coreless melting furnace mainly for steel ， alloy steel ， cast iron ， and other ferrous metal materials and stainless steel ， copper ， aluminum ， zinc and other non - ferrous metal materials melting ， melting with high efficiency ， energy - saving ， metal components uniform ， burning less temperature or block ， simple operation ， easy to supporting the advantages of production lines 中频无芯熔炼炉主要用于钢、合金钢、铸铁等黑色金属材料以及不锈钢、铜、铝、锌等有色金属材料的熔炼，具有融化效率高、节电、金属成分均匀、烧损少、温升块、操作简单、易于配套生产线等优点。
This paper introduces the measurement methods and results of cdq - boiler system for mass and energy balance diagnosis , analyses the technologic economic index at the different product rate , puts forward the measures of decreasing the ratio of coke burning , improving the heat transfer conditions and realizing the optimized control aftertime 摘要介绍了宝钢三期干熄炉锅炉系统质能诊断方案及其测试结果，分析了不同生产率下的主要技术经济指标，提出了今后进一步降低焦炭烧损率，改善炉内传热和实现优化控制的技术措施。
It ' s pointed out that , under the condition of vim refining , the amount of oxide inclusions residue in molten steel increases with the increased loss of deoxidizing elements , and the key of melting extra - low oxygen steel is to avoid the thermal decomposition of lining material ; the size of deoxidizing products increases with the increased degree of supersaturation of deoxidizing elements ; larger inclusions granules found in extra - low oxygen steel come mainly from lining material 结果表明，在真空感应熔炼条件下，残留在钢中的氧化物夹杂数量随脱氧元素铝烧损量增加而增加，熔炼超低氧钢的关键是避免炉衬热分解；脱氧产物尺寸随脱氧元素过饱和度增加而增加；超低氧钢的大颗粒夹杂主要来自炉衬材料。
