研究目的
To prototype a real-time chemical composition analysis system for welding applications and prove the feasibility of such quality control loop using laser-induced breakdown spectroscopy (LIBS).
研究成果
LIBS was successfully used to monitor metal vaporization during TIG welding, demonstrating the feasibility of in situ chemical composition analysis. The study confirmed the presence of Mn vapor above the weld pool and its condensation on the weld metal surface, with local changes in Ni and Mn compositions observed at higher welding currents.
研究不足
The study focused on a specific grade of austenitic stainless steel and TIG welding process. The influence of varying welding parameters on LIBS signal and the need for quantification of chemical compositions in future work are noted.
1：Experimental Design and Method Selection:
The study used LIBS for in situ measurement of chemical composition changes during TIG welding of austenitic stainless steel. The methodology included monitoring metal vaporization and post-weld line scans.
2：Sample Selection and Data Sources:
EN grade 1.4435 austenitic stainless steel was chosen for its good weldability properties. Chemical compositions of main alloying elements were provided.
3：4435 austenitic stainless steel was chosen for its good weldability properties. Chemical compositions of main alloying elements were provided.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: A TIG arc welding system (Castolin CastoTIG 1611 DC power supply) and a LIBS system composed of a 1064 nm Nd:YAG laser with an Echelle spectrometer Aryelle 200 were used.
4：Experimental Procedures and Operational Workflow:
Welding experiments were performed with constant shielding Ar gas flow. LIBS measurements were conducted during and after welding to monitor chemical composition changes.
5：Data Analysis Methods:
Normalized intensities of selected emission lines were used to analyze the data, with Fe I line as an internal standard for normalization.
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