Effect of fiber laser welding parameters on root humps

ZHOU Cong; XIA Hailong; CHEN Genyu; LI Shichun; LI Changzou

doi:10.7510/jgjs.issn.1001-3806.2015.05.009

In order to study influence of welding parameters on root humps in high power fiber laser welding, effect of laser power, welding speed, defocus, flow rate of bottom shielding gas and welding position on root humps was studied based on a single variable method. The results show that, with the increase of laser power, root humps tend to increase at first and then decrease. When welding speed increases, root hump height increases at first and then decreases, root hump spacing decreases significantly. When defocus is near 0mm, root hump tendency is obvious. Under the appropriate flow rate of bottom shielding gas, root hump tendency is reduced. The optimal rate is 15L/min. When welding orientation is 60, root hump tendency decreases to a certain extent. The results show that reasonable welding parameters can eliminate root hump efficiently.

Effect of fiber laser welding parameters on root humps

1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China;

2. Laser Research Institute, Hunan University, Changsha 410082, China

Received Date: 2014-09-01

Accepted Date: 2014-09-18

Available Online: 2015-09-25

Abstract: In order to study influence of welding parameters on root humps in high power fiber laser welding, effect of laser power, welding speed, defocus, flow rate of bottom shielding gas and welding position on root humps was studied based on a single variable method. The results show that, with the increase of laser power, root humps tend to increase at first and then decrease. When welding speed increases, root hump height increases at first and then decreases, root hump spacing decreases significantly. When defocus is near 0mm, root hump tendency is obvious. Under the appropriate flow rate of bottom shielding gas, root hump tendency is reduced. The optimal rate is 15L/min. When welding orientation is 60, root hump tendency decreases to a certain extent. The results show that reasonable welding parameters can eliminate root hump efficiently.

HTML

Reference (14)

[1]	XU L, LIU XX, LI QF, et al. Process study on laser welding of high strength galvanized steel with powder filling[J]. Laser Technology, 2014, 38(1): 1-5 (in Chinece).
[2]	NI T, TU Y, LU J Zh, et al.Research of processing parameters on the welding joint of ANSI304 stainless steel medium plate during optical fiber laser welding[J].Manufacture Information Engineering of China, 2011, 40(8):67-71(in Chinece).
[3]	ALAM M M, KARLSSON J, KAPLAN A F H. Generalising fatigue stress analysis of different laser weld geometries[J]. Materials Design, 2011, 32(4): 1814-1823.
[4]	KAPLAN A F H, LAMAS J, KARLSSON J, et al. Scanner analysis of the topology of laser hybrid welds depending on the joint edge tolerances[C]//12th Nordic Conference in Laser Processing of Materials.Trondheim, Norway:Publisher Norwegian University of Science and Technology, 2011: 27-29.
[5]	PEI Y L, SHAN J G, REN J L. Study ofhumping tendency and affecting factors in high speed laser welding of stainless steel sheet[J]. Acta Metallurgica Sinica, 2012, 48(12): 1431-1436(in Chinece).
[6]	PEI Y L, WU A P, SHAN J G,et al.Investigation of humping formation basedon melt flow analysisin high-speed laser weldingprocess[J]. Acta Metallurgica Sinica, 2013, 49(6): 725-730(in Chinece).
[7]	NORMAN P, KARLSSON J, KAPLAN A F H. Monitoring undercut, blowouts and root sagging during laser beam welding[C]//Proceedings of the Fifth International Conference Lasers in Manufacturing.Stuttgart,Germany:Fachverlag GmbH,2009: 355-360.
[8]	ILAR T, ERIKSSON I, POWELL J, et al. Root humping in laser welding-an investigation based on high speed imaging[J]. Physics Procedia, 2012, 39: 27-32.
[9]	HAUG P, ROMINGER V, SPEKER N, et al. Influence of laser wavelength on melt bath dynamics and resulting seam quality at welding of thick plates[J]. Physics Procedia, 2013, 41: 49-58.
[10]	ZHANGY, LI LJ, JIN X Zh,et al.Diathermaney study on keyhole effects in laser deep penetration welding[J]. Chinese Journal of Lasers, 2005, 31(12): 1538-1542(in Chinece).
[11]	FABBRO R, SLIMANI S, COSTE F, et al. Study of keyhole behaviour for full penetration Nd:YAG CW laser welding[J]. Journal of Physics,2005, D38(12): 1881.
[12]	FABBRO R, CHOUF K. Keyhole description in deep-penetration laser welding[J].Proceedings of the SPIE, 2000,3888: 104-112.
[13]	PANG Sh Y.A study on the transient key hole and moving weldpool behavi ors and mechanisms of deep penetration laser welding[D].Wuhan:Huazhong University of Science and Technology,2011:70-71(in Chinece).
[14]	MATSUNAWA A, SETO N, KIM J D, et al. Dynamics of keyhole and molten pool in high-power CO2 laser welding[J].Proceedings of the SPIE, 2000,3888: 34-45.

Effect of fiber laser welding parameters on root humps

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Proportional views