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Study on mechanical properties of austenitic stainless steel depending on heat input at laser welding

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Abstract

The austenitic stainless steels used in various industrial fields require low heat input for welding. Laser welding is an excellent welding method in this respect. This study investigates the effect of laser welding speed on the mechanical properties at welding speed of 1.0, 1.5 and 2.0 m/min, using STS304L of austenitic stainless steel. The microstructures of fusion zone (FZ) show a two phase structure consisted of austenite and δ-ferrite, and δ-ferrite in the fusion zone tend to decrease with increase of welding speed. Meanwhile, the mechanical properties were excellent at the welding speed of 1.5 m/min for tensile, bending and impact tests.

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Acknowledgements

This work supported by Research Program supported by the Ministry of Tread, Industry and Energy (MOTIE, Korea) [R004903].

Author information

Correspondence to In-Duck Park.

Additional information

Recommended by Editor Chongdu Cho

Sung-Min Jung is a master student at Pukyong Nat’l Univ., Korea. He is a research student at Korea Institute of Machinery and Materials, Republic of Korea. His current research fields are laser welding and material strength properties.

In-Duck Park received his Ph.D. from Yokohama National University, Japan. He is currently a Principal Researcher at Korea Institute of Machinery and Materials (KIMM), Republic of Korea. His current research fields are laser heat treatment and material strength properties.

Kwang-Hyeon Lee received his Ph.D. from Pusan National University, Republic of Korea. He is currently a Principal Engineer at Korea Institute of Machinery and Materials (KIMM), Republic of Korea. His current research fields are high power laser welding & DED (direct energy deposition).

Jeong Suh is a Principal Researcher at Laser Industrial Technology Research Group in Korean Institute of Machinery and Materials (KIMM). In 1992, he received his Ph.D. in Mechanical Engineering (applied mechanics programs) from Phohang Institute of Science & Technology (POSTECH). He is interested in laser & electron beam material processing and system.

Gong-Young Kim is currently working in metal reproduction at POSCO, Korea. He is an Industrial Field Professor. He is a republic of Korea master of metal reproduction field.

Ki Woo Nam (Ph.D.) is working on Department of Materials Science and Engineering, Pukyong National University, Busan, Korea. He has an interest in the crack healing and harmless crack of structural component.

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Jung, S., Park, I., Lee, K. et al. Study on mechanical properties of austenitic stainless steel depending on heat input at laser welding. J Mech Sci Technol 34, 117–126 (2020). https://doi.org/10.1007/s12206-019-1211-3

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Keywords

  • High power laser
  • Laser welding
  • Austenitic stainless steel
  • Mechanical properties
  • Heat input