Microstructures and Tensile Properties of 0Cr18Ni9 Steel Thin-Wall Tube Welded Joints by P-TIG Under Different Process Parameters

LI Ning; LIU Shaolong; DING Xuesong; XU Yuhong; FAN Wenlei; SU Huanchao; WANG Boyu

doi:10.11973/jxgccl202202009

Materials and Mechanical Engineering > 2022 > 46(2): 58-62. > DOI: 10.11973/jxgccl202202009

LI Ning, LIU Shaolong, DING Xuesong, XU Yuhong, FAN Wenlei, SU Huanchao, WANG Boyu. Microstructures and Tensile Properties of 0Cr18Ni9 Steel Thin-Wall Tube Welded Joints by P-TIG Under Different Process Parameters[J]. Materials and Mechanical Engineering, 2022, 46(2): 58-62. DOI: 10.11973/jxgccl202202009

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Microstructures and Tensile Properties of 0Cr18Ni9 Steel Thin-Wall Tube Welded Joints by P-TIG Under Different Process Parameters

1. Shuozhou Thermal Power Branch, Huadian Power International Co., Ltd., Shuozhou 036000, China;
2. Huadian Shanxi Energy Co., Ltd., Taiyuan 030006, China;
3. School of Materials Science and Engineering, Xi'an University of Technology, Xi'an 710048, China

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Received Date: December 30, 2020
Revised Date: December 20, 2021

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Abstract

Abstract

Pulse tungsten inert gas arc welding(P-TIG) was applied to weld 0 Cr18Ni9 steel tubes with specification of ϕ14 mm×2 mm, and the microstructure and tensile properties of joints under different base current(20-30 A), peak current(40-60 A), pulse frequency(0.3,0.5 Hz) and pulse width ratio of 50% were studied. The results show that the microstructures of the weld of joints under different process parameters were all austenite+δ ferrite, but the shape and content of the δ ferrite were significantly different; the austenite grains in the heat-affected zone were significantly coarsened. Under the pulse base current of 20 A, the peak current of 40 A and the pulse frequency of 0.3 Hz, the ferrite in the weld of the joint was vermicular with relatively high content, and the austenite grain size in the heat affected zone was small; the tensile properties of the joint was the best with yield strength of 401.38 MPa, tensile strength of 701.51 MPa and yield ratio of 0.57, and the fracture was composed of equiaxed dimples with uniform shape and small size.
- P-TIG welding,
- austenitic stainless steel tube,
- δ ferrite,
- tensile property

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Microstructures and Tensile Properties of 0Cr18Ni9 Steel Thin-Wall Tube Welded Joints by P-TIG Under Different Process Parameters

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