[1] BIRO E, WECKMAN D C, ZHOU Y. Pulsed Nd∶YAG laser welding of copper using oxygenated assist gases［J］. Metallurgical & Materials Transactions, 2002, A33(7):2019-2030.

[2] HESS A, WEBER R, HEIDER A, et al. Forced deep-penetration welding with low-power second-harmonic assistance of CW copper welding with 1μm wavelength［J］. Physics Procedia, 2010, B5:29-36.

[3] ZHANG L J, ZHANG G F, NING J, et al. Microstructure and pro-perties of the laser butt welded 1.5mm thick T2 copper joint achieved at high welding speed［J］. Materials & Design, 2015, 88:720-736.

[4] HESS A, SCHUSTER R, HEIDER A, et al. Continuous wave laser welding of copper with combined beams at wavelengths of 1030nm and of 515nm［J］. Physics Procedia, 2011, A12:88-94.

[5] HEIDER A, STRITT P, HESS A, et al. Process stabilization at welding copper by laser power modulation［J］. Physics Procedia, 2011, A12:81-87.

[6] JIAO J K, WANG F Y, SUN J Q, et al. Study on copper surface pre-treating and welding with fiber lasers［J］. Laser & Optoelectronics Progress, 2016, 53(3): 031409(in Chinese).

[7] WU X H, XIANG F W, LIU Y, et al. Study on laser welding of co-pper［J］. Applied Laser, 2013, 33(2): 169-172(in Chinese).

[8] HEIDER A, SOLLINGER J, ABT F, et al. High-speed X-ray analysis of spatter formation in laser welding of copper ［J］. Physics Procedia, 2013, 41:112-118.

[9] QIN G L, LIN Sh Y. Radial dimension of keyhole and its dynamic characteristics in laser deep penetration welding［ J］ .Chinese Journal of Lasers, 2005, 32(4):557-561(in Chinese).

[10] ZUO T Ch. Laser materials processing of high strength aluminum alloys［M］. Beijing:National Defense Industry Press, 2002:74(in Chinese).

[11] WANG J Ch, WANG X Zh , HUI S X. Research of linear heat input and laser focus position for laser welding HE130 titanium alloy［J］.Chinese Journal of Lasers, 2003, 30(2):179-184(in Chinese).

[12] QIANG H L, CHENG Zh G, LUO J T, et al. Influencing factors on topography of weld in deep penetration laser welding ［J］ .Acta Optica Sinica, 1999, 19(9):1289-1295(in Chinese).

[13] LU L, SHEN Y F, CHEN X H, et al. Ultrahigh strength and high electrical conductivity in copper［J］. Science,2004, 304(5669) :422-426.

[14] CALLISTER W D, RETHWISCH D G. Materials science and engineeringan introduction［M］. NewYork, USA:Wiley,2000:736.

[15] XUE P, XIAO B L, ZHANG Q, et al. Achieving friction stir welded pure copper joints with nearly equal strength to the parent metal via additional rapid cooling［J］. Scripta Materialia, 2011, 64(11):1051-1054.