焊接电流和药皮厚度对水下湿法焊接熔渣物相及微观组织的影响  

Effect of welding current and thickness of electrode coating on phase and microstructure of slag during underwater wet welding

作　　者：李海新[1] 张琳琳[1] 杨振林[1] 殷子强[1] 

机构地区：[1]山东省科学院海洋仪器仪表研究所山东省海洋环境监测技术重点实验室,青岛150001

出　　处：《焊接学报》2017年第1期77-81,共5页Transactions of The China Welding Institution

基　　金：国家自然科学基金资助项目(51305245;51505267);山东省自然科学基金资助项目(ZR2014EEP016);山东省科学院青年基金资助项目(2013QN043);青岛市应用基础研究计划资助项目(15-9-1-53-JCH);青岛市市南区科技发展资金资助项目(2015-6-029-ZH)

摘　　要：文中采用自制的金红石型药皮焊条进行水下湿法焊接,重点分析了焊接电流和药皮厚度对熔渣物相及微观组织的影响.对熔渣的宏观形貌分析发现,当药皮厚度较薄时,焊后熔渣稀薄,覆盖不均匀,此外,焊接电流对焊接飞溅有重要影响,当焊接电流较大时,焊接过程中有大量飞溅产生.通过对熔渣的碱度系数及物相分析得出,熔渣的主要组成相为Fe Ti O3和Ca Ti O3,还有少量的Mn Ti O3,Fe F3和Ca-Si-O相,药皮厚度和焊接电流对熔渣的碱度系数和组成相影响均较小.熔渣的微观组织分析发现,减小药皮厚度和增大焊接电流,熔渣中生成大量的树枝状组织,熔渣微观组织的方向性增强,有利于脱渣.In this article,the autonomousrutile type carbon steel electrode was used for underwater wet welding. It focused on the effect of the welding current and thickness of electrode coating on phase and microstructure of slag during underwater wet welding. By macro-morphology analysis,it found that when the thickness of electrode coating was thin,the slag was thin and uneven coverage. Furthermore,welding current had an important effect on welding spatter. When the welding current was large,there was a large amount of splashing in the welding process. By the analysis of basicity coefficient and phase of slag,there was a little effect of thickness of electrode coating and welding current on the basicity coefficient of slag. The main composed phase of slag was FeT iO 3and CaT iO 3,also contained a small amount of MnT iO 3,FeF 3and Ca-Si-O phase. By the microstructure analysis of slag,with the decreasing of the electrode coating and increasing of the welding current,there was a large amount of dendritic structure was formed,the direction of the microstructure of slag was enhanced,which was advantageous to the detachability of slag.

关 键 词：水下湿法焊接 熔渣 物相 微观组织 

分 类 号：TG454[金属学及工艺—焊接]