Non-invasive optical characterization and estimation of Zn porosity in gas tungsten arc welding of Fe–Al joints using CR model and OES measurements  

作　　者：Sai SRIKAR Tinku KUMAR Degala Venkata KIRAN Reetesh Kumar GANGWAR 

机构地区：[1]Department of Physics&CAMOST,Indian Institute of Technology Tirupati,Yerpedu 517619,India [2]Department of Mechanical Engineering,Indian Institute of Technology Tirupati,Yerpedu 517619,India

出　　处：《Plasma Science and Technology》2023年第11期133-141,共9页等离子体科学和技术（英文版）

基　　金：the Ministry of Human Resources and Development(MHRD),Government of India,for providing HTRA fellowship;the support by the SERB,India,for listed Grants(Nos.CRG/2018/000419,CVD/2020/000458,and SB/S2/RJN-093/2015);Core Research Grant,India(No.CRG/2020/005089);IIT Tirupati,India(No.MEE/18-19/008/NFSG/DEGA)。

摘　　要：In this study,we employed a non-invasive approach based on the collisional radiative(CR)model and optical emission spectroscopy(OES)measurements for the characterization of gas tungsten arc welding(GTAW)discharge and quantification of Zn-induced porosity during the GTAW process of Fe–Al joints.The OES measurements were recorded as a function of weld current,welding speed,and input waveform.The OES measurements revealed significant line emissions from Zn-I in 460–640 nm and Ar-I in 680–800 nm wavelength ranges in all experimental settings.The OES coupled CR model approach for Zn-I line emission enabled the simultaneous determination of both essential discharge parameters i.e.electron temperature and electron density.Further,these predictions were used to estimate the Zn-induced porosity using OES-actinometry on Zn-I emission lines using Ar as actinometer gas.The OES-actinometry results were in good agreement with porosity data derived from an independent approach,i.e.x-ray radiography images.The current study shows that OES-based techniques can provide an efficient route for real-time monitoring of weld quality and estimate porosity during the GTAW process of dissimilar metal joints.

关 键 词：optical emission spectroscopy collisional radiative model ACTINOMETRY GTAW Fe Al joints Zn vapor porosity radiographic imaging(Some figures may appear in colour only in the online journal) 

分 类 号：TG444.74[金属学及工艺—焊接]