Abstract
Keyhole-induced porosity as one of the serious defects in deep-penetration laser welding, negatively affected the mechanical properties of welded structures. Keyhole laser welding is an effective method to fully penetrate the face and web plate for T-joint steel structures used in ship building and offshore platform. It is found that shielding gas parameters play an important role in laser welding process; different flow rates, blowing angle, and distance of shielding gas are considered to study the porosity number and distribution in order to make a systematic investigation on keyhole-induced porosity formation and its influencing factors. The result shows that appropriate shielding gas flow rate, blowing angel, and distance to molten pool could help to achieve less porosity for this T-joint. Also, a high-speed photography of 1,000 fps was applied to observe the plasma over the keyhole and fluid flow of molten pool to better understand the formation process of porosity.
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 callMore From: The International Journal of Advanced Manufacturing Technology
Disclaimer: 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.
