Scholars 2nd Edition International Conference on

Optics, Lasers and Photonics

THEME: "A New Era towards Optics, Lasers & Photonics Technologies"

img2 27-28 Mar 2023
img2 Crowne Plaza Ealing, London, UK & Online
Manpeng Wu

Manpeng Wu

Tianjin University, China

Title: Study on weld formation and defects of horizontal oscillating laser-TIG hybrid welding

Biography

Manpeng Wu received his BS degree in metal materials engineering (2006) from Jiangsu University of Science and Technology, his MS degree (2017) in materials engineering processing from Jiangsu University of Science and Technology. At present, he is a Ph.D Candidates of materials processing from Tianjin University, China. He has published more than 10 research journal publications. His current research interests are focused on the laser and laser-arc hybrid welding, laser-arc hybrid additive manufacturing.

Abstract

This paper proposed a new technology of circular oscillation laser-TIG hybrid filler welding in the horizontal position for HSLA steel thick plate narrow gap welding. The effect of different heat source parameters on the weld formation was systematically studied. The plasma behavior, molten pool and keyhole behavior of different heat source patterns were analyzed. Filling welding were carried out and the defect generation mechanisms were discussed. In this experiment, an oscillation laser-TIG hybrid welding system was used, which consisted of a set of IPG YLS-12000 fiber laser, one oscillation laser head, one TIG welding torch and a set of wire feeding devices. The Acuteye high-speed imaging system V4.0 with the acquisition frame rate 4000 frames and a dedicated background light source were used for plasma and molten pool photography.
The results show that, oscillation laser-TIG hybrid welding can effectively improve weld formation and suppress welding pores and incomplete fusion. The coupling action of the laser-TIG arc weakens with the increase of oscillation amplitude and the distance between laser and tungsten electrode. The hybrid plasma generates periodic changes with laser oscillation and makes the energy distribution more uniform, which improves sidewall fusion and avoids a large number of bubbles. The keyhole stirs the molten pool and drives the molten pool to scour the groove sidewall, which is beneficial to improve sidewall fusion and suppress pores. Oscillation laser-TIG hybrid welding with an oscillation amplitude of 4 mm and the distance between laser and tungsten electrode of 3 mm can obtain high-quality weld with well weld morphology.