The investigation of the ramping length of the stainless steel railway vehicle laser welding seam

Based on the welding problems of 304 stainless steel serpentine flow industrial condensation plate, the three kinds of CO2 laser welding procedures are adopted to manufacture the condensation plate. The optical microscope, SEM, EDS, micro-hardness and tensile tests are used to analyze the microstructure and micro-hardness of 304 stainless steel sheet joint. The relationships between the generated defects and carbide separation in the welding joint are discussed. Due to the grain refinement, the micro-hardness of welding seam is increased. Therefore, it is reasonable factors that the heat input, cooling velocity and temperature gradient to improve the defects of 304 stainless steel serpentine flowing channel industrial condensation board in CO2 laser welding.

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Influence of shielding gas for microstructure and properties of lap laser welding stainless steel railway vehicle

Advanced Materials and Information Technology Processing ◽

10.2495/amitp130081 ◽

2014 ◽

Author(s):

Hongxiao Wang ◽

Chunsheng Wang ◽

Qingzhu Liu ◽

Xuefeng Zhang ◽

Liqi Kang

Keyword(s):

Stainless Steel ◽

Laser Welding ◽

Railway Vehicle ◽

Shielding Gas ◽

Microstructure And Properties ◽

Welding Stainless Steel

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Investigation of laser welding development and application on high standard stainless steel railway vehicle

10.1117/12.2616599 ◽

2021 ◽

Author(s):

Hongxiao Wang ◽

Chunsheng Wang ◽

Guangzhong He ◽

Wenwen Gao ◽

Kai Li ◽

...

Keyword(s):

Stainless Steel ◽

Laser Welding ◽

High Standard ◽

Railway Vehicle

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Investigation of Controlling Process of Laser Welding Parameters on Stainless Steel Railway Vehicle

Mechanical Engineering and Technology ◽

10.12677/met.2016.52015 ◽

2016 ◽

Vol 05 (02) ◽

pp. 115-119

Author(s):

立国刘

Keyword(s):

Stainless Steel ◽

Laser Welding ◽

Welding Parameters ◽

Railway Vehicle

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Mechanical Properties Study of Fe-Mn-Si Shape Memory Alloys Welding Seam Formed by Laser Welding with Filler Powder

Materials ◽

10.3390/ma11081454 ◽

2018 ◽

Vol 11 (8) ◽

pp. 1454 ◽

Cited By ~ 2

Author(s):

Heng Ju ◽

Chengxin Lin ◽

Yun Tian ◽

Zhijie Liu ◽

Huiling Jiang ◽

...

Keyword(s):

Mechanical Properties ◽

Residual Stress ◽

Stainless Steel ◽

Fatigue Strength ◽

Laser Welding ◽

Strengthening Mechanism ◽

304 Stainless Steel ◽

Distribution Law ◽

Welding Seam ◽

Filler Powder

To reduce the residual stress and improve the fatigue property of the laser weldment by using the stress self-accommodation characteristic of Fe-Mn-Si shape memory alloys (SMAs), a Fe15Mn5Si12Cr6Ni memory alloy welding seam was formed inside 304 stainless steel by laser welding with filler powder. The combination of the hole-drilling method and the ANSYS software was used to research the distribution law of residual stress inside the laser welding specimen. The fatigue strength of the laser welded specimens with the Fe-Mn-Si SMAs welding seam (experimental materials) and 304 stainless steel welding seam (comparative materials) was measured by cycle bending fatigue test. The microhardness of the welding specimens was measured by the microhardness tester. The thermodynamic model of the laser welding process and the phase transition crystallography of Fe-Mn-Si SMAs were evaluated to analyze the strengthening mechanism of the mechanical properties in the experimental materials. The results show that the distribution law for residual stress in the experiment and simulation are consistent. The experimental materials possess low residual stress, high fatigue strength and high microhardness. The strengthening mechanism for mechanical properties is the welding residual stress-induced γ→ε martensitic transformation inside the experimental materials, which causes the tensile plastic strain of the welding seam to resist residual compression strain, and the residual stress, as the transition driving force, is released in shear processing.

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