US 11,931,826 B2
Continuous welding method and device for hybrid welding, welded finished product, train body
Xiaohui Han, Qingdao (CN); Zhendong Mao, Qingdao (CN); Yuexin Gao, Qingdao (CN); Kai Zheng, Qingdao (CN); and Gangqing Li, Qingdao (CN)
Assigned to CRRC QINGDAO SIFANG CO., LTD., Qingdao (CN)
Appl. No. 17/047,685
Filed by CRRC QINGDAO SIFANG CO., LTD., Qingdao (CN)
PCT Filed Sep. 9, 2019, PCT No. PCT/CN2019/104848
§ 371(c)(1), (2) Date Oct. 14, 2020,
PCT Pub. No. WO2020/206923, PCT Pub. Date Oct. 15, 2020.
Claims priority of application No. 201910277678.7 (CN), filed on Apr. 8, 2019.
Prior Publication US 2021/0162542 A1, Jun. 3, 2021
Int. Cl. B23K 26/348 (2014.01); B23K 26/04 (2014.01); B23K 26/70 (2014.01)
CPC B23K 26/348 (2015.10) [B23K 26/048 (2013.01); B23K 26/702 (2015.10)] 4 Claims
OG exemplary drawing
 
1. A continuous welding method for hybrid welding, wherein two welding pieces form a groove, a bottom of the groove is provided with a backing, the backing is integrated with an end of one welding piece, and an end of the other welding piece is located on the backing,
the method comprising:
performing hybrid welding on the groove by coupling a laser and a variable polarity arc;
wherein a defocusing distance of the laser is H, a Rayleigh length of the laser is ZR, H is greater than 2ZR,
a conjugate focal length of the laser is b, and b=2*ZR;
a radius of a laser beam of the laser in the Z direction is W(Z), and a minimum value of W(Z) appears at point A, wherein W(A)=W0;
a wavelength of the laser beam is λ, wherein

OG Complex Work Unit Math
a power density of the laser is I, an energy of the laser is E, and a spot area of the laser is S, wherein

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the method further comprising:
filling a welding wire in the groove while conducting the hybrid welding on the groove through the laser and the variable polarity arc to cause the welding wire to be melted in the groove to form a weld seam.