Micro laser welding of dissimilar materials between TiNi shape memory alloy and titanium alloy

Butt welding of 0.2mm thick TiNi shape memory alloy sheet was successfully realized by using micro impulse laser whose average power is 80W and the microstructure of welded joint was study in this paper. The results show that, the welded joint of micro laser welding can be divided into four zones according to grain size and microstructure. The microstructure in base metal zone is rolled structure and the grains are coarse and heterogeneous. The microstructures of welded seam center zone are fine equiaxed crystals and the microstructures of both lower surface and upper surface edge zone are columnar crystals. There is almost no obvious coarse grain heat-affected zone at the edge between welded seam and base metal. There is obvious segregation layer in local area of welded seam because the content of Ti and Ni elements is changed and different with base metal during the crystallizing course of welding pool.

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Laser welding of NiTi shape memory alloy

Pacific International Conference on Applications of Lasers and Optics ◽

10.2351/1.5056989 ◽

2008 ◽

Cited By ~ 5

Author(s):

Wei Wang ◽

Li Chen ◽

Xing-Ke Zhao ◽

Ji-Hua Huang

Keyword(s):

Shape Memory Alloy ◽

Laser Welding ◽

Shape Memory ◽

Niti Shape Memory Alloy

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Laser welding of NiTi shape memory alloy wires and tubes for multi-functional design applications

Smart Materials and Structures ◽

10.1088/0964-1726/25/8/085001 ◽

2016 ◽

Vol 25 (8) ◽

pp. 085001 ◽

Cited By ~ 25

Author(s):

Zhi Zeng ◽

Mao Yang ◽

João Pedro Oliveira ◽

Di Song ◽

Bei Peng

Keyword(s):

Shape Memory Alloy ◽

Laser Welding ◽

Shape Memory ◽

Niti Shape Memory Alloy ◽

Functional Design

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Study on YAG Laser Welding Process of Fe-Mn-Si Shape Memory Alloy

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.37-38.1364 ◽

2010 ◽

Vol 37-38 ◽

pp. 1364-1367 ◽

Cited By ~ 1

Author(s):

Chao Yu Zhou ◽

Cheng Xin Lin ◽

Lin Lin Liu

Keyword(s):

Tensile Strength ◽

Shape Memory Alloy ◽

Laser Welding ◽

Shape Memory ◽

Cross Section ◽

Welded Joint ◽

Processing Parameters ◽

Welding Seam ◽

Yag Laser ◽

Optimal Processing

In this study, 1mm thick Fe-Mn-Si shape memory alloy was welded by both sides using YAG laser welding. In a certain range of parameters, the optimal processing parameters for the maximum tensile strength are current 100 A, pulse frequency 3 Hz and pulse width 15 ms by orthogonal experiment. With the optimal processing parameters, the tensile strength of the welded joint can achieve 94% of base material,and the fracture appears in the center of welding seam and the surface morphology of welding seam is good. The influence of processing parameters on tensile strength of weld joint is directly embodied in cross-section of the welding seam morphology. In the laser welding, the tensile strength of nonpenetration in seam and hourglass shape welded joint is generally poor, and the perfect welded joint has conditions such as wide welding seam, deep penetration, weld pool filling and “non-hollow”. Most importantly, the central area in cross-section of the welding seam is the widest.

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