Experimental Study on Laser Welding Process of Ultra Thin 316L Stainless Steel
Laser welding is the most effective joining method for thin 316 L plate which is widely used in thin-walled components such as bipolar plates and plate heat exchanger.Traditionally,the multi mode fiber laser is adopted to weld the thin plates to form fluid field.However,the excessive welding heat usually produces severe distortions because the divergence angle of multi mode fiber laser is not tiny enough.The single mode fiber laser beam with smaller divergence angle was used to weld 0.1mm thick 316 L plate.It's found that single mode fiber laser can join BPPs effectively with narrower weld width,deeper penetration and smaller distortion.