Simulation Test of Mechanical Properties of B-type Sleeve Fillet Weld

doi:10.11885/j.issn.1674-5086.2020.10.15.03

Abstract

Abstract: The girth weld defects of X80 steel pipes are generally reinforced by B-type sleeves. In order to carry out the simulation test of the mechanical properties of the B-type sleeve fillet welds, and explore the influence of ultrasonic impact on the mechanical properties, a number of sets of X80 steel fractal fillet weld specimens are designed to simulate the tensile and bending of the reinforced pipe, and low-cycle fatigue conditions. Using universal testing machine and fatigue testing machine, the maximum tensile force, maximum bending load and tensile force-cycle number curve (analog S-N curve) of the specimen before and after ultrasonic impact treatment are measured. The test results show that ultrasonic impact treatment of fillet welds has basically no effect on the tensile strength, bending strength, and fatigue strength of the B-type sleeve structure; in the extreme case of complete cracking of the pipe girth weld, the ultimate bending moment that the B-type sleeve fillet weld can withstand is about 69% of the pipe base material. The test results can provide basic data for determining the applicable conditions of the B-type sleeve.

Key words: X80 steel, B-type sleeve, fillet weld, ultrasonic shock, mechanical properties

CLC Number:

TE973

CHENG Zhiqiang, HU Cong, DUAN Jinwei, Lü Zhiwei, YANG Tao. Simulation Test of Mechanical Properties of B-type Sleeve Fillet Weld[J]. Journal of Southwest Petroleum University(Science & Technology Edition), 2021, 43(6): 111-118.

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