Depth distribution analysis of copper in copper infiltration zone of welding joint surface by laser induced breakdown spectrometry
LI Dong-ling1, 2, ZHANG Yong1, LU Feng-hua3
1.Central Iron and Steel Research Institute,Beijing 100081; 2.Beijing Key Laboratory of Metal Material Characterization, Beijing 100081,China; 3.Pipeline Research Institute of CNPC, Langfang 065001,China
Abstract：Laser induced breakdown spectrometry (LIBS) was used for the depth distribution analysis of Cu in the central zone of welding joint root from different product technology. The relationship between the number of excitation pulses of LIBS and the ablation depth in different materials was investigated. It was found that there was good linear relationship between excitation pulse and ablation depth within ten pulses and the depth of ablation depth on welding material was smaller than the depth on copper back-up shoes. The depth of copper infiltration zone was calculated. At the same time, the matched quantitative analysis calibration curve was drawn and the content distribution of copper in the depth direction of different copper infiltration zone was obtained. It was found that there was great difference for the degree of copper infiltration from different product technologies.Serious copper infiltration appeared in some zone of the welding joint using the pulse control technology with copper back-up shoes root welding. The mass fraction of copper in the surface was above 0.5% and the depth of copper infiltration also surpassed 50 μm. There was a little copper infiltration for sample SY2 welded by short ace control technology with copper back-up shoes root and the content of copper in the surface didn′t supass 0.5% with the infiltration depth below 10 μm. But the phenomenon of copper infiltration didn′t appear in the SY3 sample without copper back-up shoes root welding technology.
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LI Dong-ling, ZHANG Yong, LU Feng-hua. Depth distribution analysis of copper in copper infiltration zone of welding joint surface by laser induced breakdown spectrometry. , 2015, 35(1): 19-25.
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