Affecting factors of pulse laser welding property of Al-Mg series aluminum alloy

ZHANG Jixiang; LIU Fengzhi; GAO Bo; YIN Xiaoyi; YANG Pan

doi:10.7510/jgjs.issn.1001-3806.2015.06.028

In order to study effect of aluminum surface state and welding processing on the properties of welding joints, the process of laser welding Al-Mg series aluminum alloy with Nd:YAG laser was analyzed in theory and verified in experiments. The experimental results of the characteristics of welding joints were obtained. The results show that welding process of untreated sample and alkali corrosion surface treatment sample are not stable while welding process of anodizing treatment sample is stable and hole effect is formed stably. Weld seam penetration and depth-to-width ratio are all improved effectively by the aid of anodizing, double welding and powder filling welding. The tensile strength of the weld seam of anodizing sample, double-sided welding sample and powder filling welding sample increases more than 1 times and powder filling welding sample of Al-0.05Si has the highest tensile strength. Hardness of all surface treatment samples is improved and the effect of phosphoric acid anodizing is the best. Hardness of weld seam and fusion zone is improved through double welding. Central hardness of powder filling weld is lower while hardness of fusion zone increases obviously. Hardness of heat affected zone of double welding and powder filling welding is lower than hardness of single side welding. The results show that anodic oxidation surface treatment and double-sided welding technology can improve the property of laser welding of Al-Mg series aluminum alloy effectively.

Affecting factors of pulse laser welding property of Al-Mg series aluminum alloy

1. School of Mechatronics & Automotive Engineering, Chongqing Jiaotong University, Chongqing 400074, China

Received Date: 2014-09-24

Accepted Date: 2014-12-01

Available Online: 2015-11-25

Abstract: In order to study effect of aluminum surface state and welding processing on the properties of welding joints, the process of laser welding Al-Mg series aluminum alloy with Nd:YAG laser was analyzed in theory and verified in experiments. The experimental results of the characteristics of welding joints were obtained. The results show that welding process of untreated sample and alkali corrosion surface treatment sample are not stable while welding process of anodizing treatment sample is stable and hole effect is formed stably. Weld seam penetration and depth-to-width ratio are all improved effectively by the aid of anodizing, double welding and powder filling welding. The tensile strength of the weld seam of anodizing sample, double-sided welding sample and powder filling welding sample increases more than 1 times and powder filling welding sample of Al-0.05Si has the highest tensile strength. Hardness of all surface treatment samples is improved and the effect of phosphoric acid anodizing is the best. Hardness of weld seam and fusion zone is improved through double welding. Central hardness of powder filling weld is lower while hardness of fusion zone increases obviously. Hardness of heat affected zone of double welding and powder filling welding is lower than hardness of single side welding. The results show that anodic oxidation surface treatment and double-sided welding technology can improve the property of laser welding of Al-Mg series aluminum alloy effectively.

HTML

Reference (16)

[1]	CAO L J,ZHANG Ch M. CO2 laser welding process and weld shaping of 5A02 aluminum alloys[J].Welding Technology,2010,39(9):35-38(in Chinese).
[2]	SUN F J, WEI H K. Technology of laser welding onAl-5Mg-0.3Sc [J]. Transactions of the China Welding Institution, 2009, 30(3):10-12(in Chinese).
[3]	DAI J J. Research progress on technological properties of laser welding of aluminum alloys [J]. Electric Welding Machine,2010,40(3):20-23(in Chinese)
[4]	ZHAO H, WHITE D R. Current issue and problems in laser welding of automotive aluminum alloys[J].International Materials Reviews,1999,44(6):238-266.
[5]	GAKU K, SHIGERU Y, KENZO N, et al. Fundamental study about CO2 laser welding of titanium aluminide intermetallic compound[J]. Proceedings of the SPIE, 2000,4088: 287-290.
[6]	WANG Y R, ZHANG Zh D ,FENG J C, et al. Effects of surface conditions on spot welded joint of magnesium alloy[J].Transactions of the China Welding Institution, 2004,25(3):27-30(in Chinese).
[7]	CAI H, KONG X F, XIAO R Sh. Effect of surface status on microstructures and solidification cracking susceptibility in laser beam welding of 2524 aluminum alloy[J]. Chinese Journal of Lasers, 2013,40(2):0203002(in Chinese).
[8]	CHEN K, XIAO R Sh, ZHANG Sh H, et al.CO2 laser welding process of aluminum alloy with filler powder[J].Transactions of The China Welding Institution, 2006,27(10):33-36(in Chinese).
[9]	XU F, LI X Y, YANG J, et al. Laser welding process of 5A06 aluminum alloy with filler wire[J].Welding Joining, 2008(8):26-28(in Chinese).
[10]	SNCHEZ-AMAYA J M, DELADO T, GONZLEZ-ROVIRA L, et al. Laser welding of aluminium alloys 5083 and 6082 under conduction regime[J]. Applied Surface Science, 2009, 255(23): 9512-9521.
[11]	ALSHAER A W, LI L, MISTRY A. The effects of short pulse laser surface cleaning on porosity formation and reduction in laser welding of aluminium alloy for automotive component manufacture[J].Optics Laser Technology,2014, 64:162-171.
[12]	YU Y Ch, WANG Ch M, YU Sh F. Microstructures and property of butt laser joints of aluminium alloy 5A06 sheets with filler[J].Laser Technology,2010,34(1):34-36 (in Chinese).
[13]	LIU Sh H, LIU J L, LIU H, et al. AZ91 magnesium alloy welding based on YAG pulsed laser[J].Laser Technology, 2010,34(4):459-462(in Chinese).
[14]	ZOU Y F, JIN X Z,HE Y N, et al. Study on improving mechanical properties of the welds by filling magnesium powder during laser welding 5052 aluminum alloy[J].Laser Technology,2013,37(6):712-717 (in Chinese).
[15]	ZHANG Sh H, CHEN K, XIAO R Sh, et al. Influence of metal powder on high power CO2 laser welding of aluminum alloy[J].Chinese Journal of Lasers,2005,32(6):860-863(in Chinese).
[16]	NIU R F, LIN B H,WANG Y N, et al. Evaporation loss of Mg element in pulsed laser welding of 5A05 aluminum alloy and distribution of micro-hardness of welding joint[J].Transactions of the China Welding Institution,2010,31(3):81-84(in Chinese).

Affecting factors of pulse laser welding property of Al-Mg series aluminum alloy

Abstract

References

Proportional views

通讯作者: 陈斌, bchen63@163.com

Proportional views