研究目的
Investigating the effects of droplet transfer mode on the state of the plasma in MIG welding through 3D spectroscopic measurement.
研究成果
The study successfully measured the asymmetrical distribution of argon and metal vapour in MIG welding arcs, revealing that globular transfer modes exhibit greater deviation in argon distribution compared to iron vapour from an axially symmetric double-ring structure. This provides new insights into the complex behavior of arc plasma under different transfer modes.
研究不足
The study was limited to relative emission intensity measurements without quantification into physical quantities such as temperature. The method also cannot measure areas obscured by droplets or spatter.
1：Experimental Design and Method Selection:
The study used a multidirectional simultaneous measurement system with 12 CCD cameras to capture axially asymmetric GMA phenomena. Two types of narrowband interference filters for Ar I and Fe I were used during the measurement.
2：Sample Selection and Data Sources:
The measurement focused on MIG welding processes under different transfer modes (globular and spray transfer) using a ?1.2 mm solid wire YGW-12 and mild steel as the base metal.
3：2 mm solid wire YGW-12 and mild steel as the base metal.
List of Experimental Equipment and Materials:
3. List of Experimental Equipment and Materials: The setup included 12 CCD cameras, narrowband interference filters for Ar I and Fe I, a tilting jig for wavelength correction, and a median filter for noise reduction.
4：Experimental Procedures and Operational Workflow:
The cameras were arranged alternately at 15° intervals to capture the welding arc from multiple directions simultaneously. The exposure time was set to 40 μs.
5：Data Analysis Methods:
The ML-EM method was used for image reconstruction to analyze the asymmetrical intensity distributions of argon and metal vapour.
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