铁素体球墨铸铁与20钢的闪光对焊

试验使用铁素体球墨铸铁和20钢的实心棒料进行了闪光对焊，通过改变次级电压4～8级，通电时间3～5s，观察其焊接接头组织的变化并测定其抗拉强度。结果表明，接头由三个区组成；当通电时间一定时，抗拉强度随次级电压的升高先减小后增大；当次级电压一定时，抗拉强度随通电时间的增加而增大。在次级电压为8级、通电时间为5s时，抗拉强度达最大值，为370．8MPa，是20钢母材的90.4％，是球墨铸铁母材的83.7％。

Flashing butt welding between ferrite spheroidal graphite cast iron and 20 steel

The experiments have been caried out by flash butt welding of the ferrite spheroidal graphite cast irons with solid stick of 20 steel. By changing beta voltage 4-8 standing, voltaic time 3-5 seconds, the microstructure and tension strength of welded joints were measured. The results show that the welded joints consist of three zone. When the voltaic time remains unchanged, the tension strength of welded joints would become lower and then become higher. When the beta voltage remains unchanged, the tension strength becomes higher with the imcreasing of voltaic, time. When the beta voltage is 8 standing and the voltaic time is 5 seconds, the tension strength of the welded joints is up to the maximum 370.8MPa, which is 90.4% of 20 pipeline steel and 83.7% of spheroidal graphite cast iron.