Monitoring the Degree of Full Penetration in Laser Beam Welding

The presence of lubricants on the surface of sheets favors the formation of pores in laser welded seams. This formation process was investigated by means of high-speed X-ray imaging of the full penetration laser beam welding process of two AA6016 aluminum sheets in overlap configuration. The measurement of the growth velocity of the bubbles indicated their sudden growth once they started to form. Further analysis of the X-ray images identified the point of origin of the pores: a few millimeters behind the capillary between the two aluminum sheets. The study shows that the lubricant does not affect the stability of the capillary, which evidences that the formation of these pores is not caused by the fluctuations of the capillary. These results explain for the first time why pore formation cannot be avoided by process strategies, which stabilize the capillary, when welding uncleaned sheets.

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Thermoelectric currents and thermoelectric-magnetic effects in full-penetration laser beam welding of aluminum alloy with magnetic field support

International Journal of Heat and Mass Transfer ◽

10.1016/j.ijheatmasstransfer.2018.08.004 ◽

2018 ◽

Vol 127 ◽

pp. 332-344 ◽

Cited By ~ 8

Author(s):

Jicheng Chen ◽

Yanhong Wei ◽

Xiaohong Zhan ◽

Cheng Gu ◽

Xinyi Zhao

Keyword(s):

Magnetic Field ◽

Aluminum Alloy ◽

Laser Beam ◽

Laser Beam Welding ◽

Magnetic Effects ◽

Full Penetration

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Finite element modeling of an alternating current electromagnetic weld pool support in full penetration laser beam welding of thick duplex stainless steel plates

Journal of Laser Applications ◽

10.2351/1.4943906 ◽

2016 ◽

Vol 28 (2) ◽

pp. 022404 ◽

Cited By ~ 12

Author(s):

Marcel Bachmann ◽

Richard Kunze ◽

Vjaceslav Avilov ◽

Michael Rethmeier

Keyword(s):

Finite Element ◽

Stainless Steel ◽

Laser Beam ◽

Finite Element Modeling ◽

Duplex Stainless Steel ◽

Weld Pool ◽

Laser Beam Welding ◽

Alternating Current ◽

Steel Plates ◽

Full Penetration

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Effect of Laser Modification Welding on Formation of Aluminum Alloy

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.228-229.1017 ◽

2011 ◽

Vol 228-229 ◽

pp. 1017-1021

Author(s):

Fei Xu ◽

Jing Yang

Keyword(s):

Aluminum Alloy ◽

Laser Beam ◽

Laser Beam Welding ◽

Laser Modification ◽

Full Penetration ◽

Welding Defects ◽

Surface Depression ◽

Strength And Toughness

Effects of laser modification welding (LMW) on formation of full-penetration weld were studied, which were based on the laser beam welding (LBW) process of 5A02 aluminum alloy. The results indicated that the welding defects (such as undercut, surface depression and so on) could be improved obviously, and the microstructure of joint by LMW could be finer than that of joint only by LBW. Besides, the strength and toughness of joint would also be increased to some extent by LMW after full-penetration LBW. Therefore, the LMW is an effective method in order to strengthen joint of LBW.

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