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Affiliation of Author(s):材料科学与技术学院

Title of Paper:Influences of friction stir welding parameters on morphology and tensile strength of high density polyethylene lap joints produced by double-pin tool

Journal:JOURNAL OF MANUFACTURING PROCESSES

Key Words:Double-pin tool Submerged friction stir lap welding High density polyethylene Morphology Tensile strength

Abstract:A double-pin tool is adopted in the submerged friction stir lap welding of high density polyethylene sheets in the present investigation. Effects of welding parameters (rotational speed, welding speed, plunge depth) on weld morphology and tensile strength are investigated. The experiment is arranged by taguchi's L9 orthogonal array. Macromorphology and microstructure of three typical welds are observed and compared. Analysis of variance is adopted to assess the importance of each welding parameter to the joint strength. The results show that joint with low tensile strength presents poor weld formation. Voids and cracks can be observed in the nugget by scanning electron microscope. Joint with high strength shows excellent nugget formation and inverted bowl-shaped weld cross section. Joint strength increases with the increase of rotational speed or the decrease of welding speed. Small or large plunge depth is not beneficial to the joint strength. The joint with maximum tensile strength of 15.3 MPa is obtained at rotational speed of 1300 r/min, welding speed of 20 min/min and plunge depth of 0.1 mm. Welding speed has the most significant effect on the joint strength, about 75.37%, while plunge depth has the least influence. (C) 2017 The Society of Manufacturing Engineers. Published by Elsevier Ltd. All rights reserved.

ISSN No.:1526-6125

Translation or Not:no

Date of Publication:2017-08-01

Co-author:Yan, Yinfei,Lan, Bing,Gao, Jicheng

Correspondence Author:SHEN Yifu