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采用FCB焊对20 mm厚的D32高强度船体结构钢板使用不同的焊剂进行焊接,得到不同的焊接接头。总结了FCB焊焊接接头的结晶生长方式,并对比分析了使用不同焊剂的两种焊接接头的微观组织形貌和化学组成。结果表明:使用NSH-55EM焊剂所得焊接接头的组织主要是针状铁素体和珠光体;使用55E-6/B-5焊剂所得焊接接头的组织主要由先共析铁素体、侧板条铁素体及少量针状铁素体、珠光体组成;所得焊缝金属的Mn/Si值55E-6/B-5焊剂比NSH-55EM焊剂的低,合金元素Ti、B和Ni过渡焊缝中较少,使焊缝组织不同,从而引起性能差别较大。
The use of FCB welding of 20 mm thick D32 high strength hull structural steel using different flux welding, get different welded joints. The crystal growth modes of FCB welded joints were summarized. The microstructure and chemical composition of two kinds of welded joints with different fluxes were compared and analyzed. The results show that the microstructure of the welded joint obtained by using NSH-55EM flux is mainly acicular ferrite and pearlite. The microstructure of the weld joint obtained by using 55E-6 / B-5 flux is mainly composed of pro-eutectoid ferrite, Ferrite and a small amount of acicular ferrite and pearlite. The obtained weld metal has a lower Mn / Si value 55E-6 / B-5 flux than the NSH-55EM flux. The alloying elements Ti, B and Ni transition welds In the less, the weld tissue is different, resulting in large differences in performance.