活性剂对焊缝熔深及微观组织的影响  

Effect of Active Fluxes on Penetration and Microstructure of TIG Welding

作　　者：宋天革[1] 钟听[2] 

机构地区：[1]无锡职业技术学院机械技术学院,江苏无锡214121 [2]哈尔滨工业大学(威海)材料科学与工程学院,山东威海264209

出　　处：《热加工工艺》2010年第21期139-141,共3页Hot Working Technology

摘　　要：研究了SiO2、CaF2、TiO2、Cr2O3和NaF五种单一成分活性剂及SiO2与Cr2O3混合活性剂对低合金高强钢TIG焊焊缝组织及熔深的影响。结果表明:与传统的TIG焊相比,活性剂能不同程度的提高焊缝熔深,涂敷Cr2O3、Cr2O3+SiO2活性剂的焊缝熔深是未涂活性剂焊缝的2倍以上。SiO2与Cr2O3混合活性剂不仅能提高熔深,而且对焊缝组织有明显的改善作用,使焊缝中细小的针状铁素体数量增加。该混合活性剂对针状铁素体形成的作用,可能与活性剂的涂敷会促进焊缝中锰、铬和硅的氧化物形成、降低针状铁素体的形核功有关。The effects of active fluxes with single component（SiO2,CaF2,TiO2,Cr2O3,NaF） and the mixture component SiO2 and Cr2O3 on the penetration and microstructure of high-strength low alloy steel was discussed.The results show that the active fluxes can increase the penetration differently,and a great increase of the penetration occurs in the active flux of SiO2 and Cr2O3 mixture,the penetration is 2 times as deep as traditional TIG welding.The effect of SiO2 and Cr2O3 mixture on microstructure is due to a small change in weld metal composition and the increase active nucleation sites for acicular ferrite.

关 键 词：A-TIG焊 活性剂 熔深 微观组织 

分 类 号：TG444.74[金属学及工艺—焊接]