Effect of alloy element on weld pool dynamics in laser welding of aluminum alloys

被引：50
|
作者：
Miyagi, Masanori [1 ]
Wang, Hongze [2 ]
Yoshida, Ryohei [2 ]
Kawahito, Yousuke [2 ]
Kawakami, Hiroshi [3 ]
Shoubu, Takahisa [4 ]
机构：
[1] Hitachi Ltd, Res & Dev Grp, 7-1-1 Omika, Hitachi, Ibaraki 3191292, Japan
[2] Osaka Univ, JWRI, Osaka, Japan
[3] Mie Univ, Grad Sch Engn, 1577 Kurimamachiya Cho, Tsu, Mie 5148507, Japan
[4] Japan Atom Energy Agcy, Sect Nucl Sci Res, Mat Sci Res Ctr, 1-1-1 Kouto, Sayo, Hyogo 6795148, Japan
来源：
SCIENTIFIC REPORTS | 2018年 / 8卷
关键词：
KEYHOLE INSTABILITY; POROSITY FORMATION; STAINLESS-STEEL; BEAM; MAGNESIUM;
D O I：
10.1038/s41598-018-31350-4
中图分类号：
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号：
07 ; 0710 ; 09 ;
摘要：
In this manuscript, weld pool dynamics in laser welding of various series of aluminum alloys were investigated by the in situ X-ray phase contrast imaging system. The experimental results showed that metal irradiated by laser was evaporated immediately, which generated the keyhole. Then metal surrounding the keyhole was melted gradually with the heat from keyhole. The growth rate of keyhole depth had a positive linear correlation with the total content of low boiling temperature elements (TCE), so did the keyhole depth and diameter at the stable stage. Longitudinal view area of the molten pool had a negative linear correlation with the thermal conductivity of aluminum alloy. The measured laser absorption rate had the same variation trend with the ratio of keyhole depth to diameter, and the highest absorption rate of 58% appeared in laser welding of aluminum alloy with TCE equal to 2.1%. Violent fluctuation in keyhole shape was avoided in aluminum alloy with TCE lower than 2.1%, where the surface tension and recoil pressure of metal vapor were balanced. To sum up, the effect of alloy element on weld pool dynamics in laser welding of aluminum alloys was firstly quantified in this manuscript.
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页数：10
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