期刊
SCIENCE AND TECHNOLOGY OF WELDING AND JOINING
卷 14, 期 5, 页码 457-467出版社
MANEY PUBLISHING
DOI: 10.1179/136217109X434252
关键词
Hybrid welding; Welding direction; Oxygen content; Distribution of alloying elements; Drag force of plasma jet; Marangoni flow
The effect of welding parameters on the distribution of wire feeding elements has been investigated during CO2 laser and pulsed gas metal arc hybrid welding process. The molten metal flow on the pool surface and inside of the samples was observed by a high speed video camera and an in situ X-ray transmission imaging system respectively. The results indicate that the fluid flow towards the inside of keyhole, namely inward flow, improves the homogeneity of weld metal. The distribution of alloying elements is more homogeneous in leading laser compared with leading arc, since both of the drag force of the plasma jet and momentum of droplet promote the inward flow in leading laser. Almost homogeneous distribution of alloying elements can be attained if the oxygen content in the shielding gas is more than 2%, since the Marangoni flow direction changes from outward to inward with increasing the oxygen content.
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