Abstract
Plasma oscillations were investigated by electrical detection under different operating parameters during bead-on-plate welding of 304 stainless steel with a Nd:YAG laser. The varied parameters were the laser output power, welding speed, assistant gas type and assistant gas flow rate. The plasma electrical signals were detected by a passive electrical probe and analyzed in the frequency domain by power spectral density analysis. Combined with observation of the corresponding weld cross sections, the fluctuating characteristics of the plasma in different welding modes were obtained. A high-speed camera was employed to observe the plasma during experiments using different types and flow rates of side assistant gas. The features of plasma, including the plasma area and inclination angle, were extracted by the mathematical morphology method. By comparing the electrical signal of plasma with the extracted plasma features, the effects of the side assistant gas on the oscillations of plasma were discussed.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
