The influence of gradient mismatches on mechanical properties and microstructure of 2219-T6 aluminum alloy VP-TIG joints

Zongliang Lü; Chong Li; Long Wan; Zhenguo Hou; Xiaoxia Chen; Hao Wu; Yongxian Huang

doi:10.12073/j.cw.20170904001

The influence of gradient mismatches on mechanical properties and microstructure of 2219-T6 aluminum alloy VP-TIG joints

Zongliang Lü^*
, Chong Li
, Long Wan
, Zhenguo Hou
, Xiaoxia Chen
, Hao Wu
, Yongxian Huang

^*Corresponding author for this work

School of Materials Science and Engineering

Ltd.
CRRC Corporation Limited

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

Abstract

In this paper, 6 mm thick 2219-T6 aluminum alloy was joined by means of variable polarity tungsten-arc welding (VP-TIG) and the influence of gradient mismatches on VP-TIG joints is investigated. The average tensile strength of the joints reduces 32%, 53% and 59%, when the mismatch of the joint was 0.635 mm, 1.44 mm, 1.83 mm, respectively. Incomplete penetration, additional bending moment (Ma) and decrease of effective load region area are considered to explain this phenomenon. The fracture location of tensile specimens occurred at the weld zone (WZ) close to partial melt zone (PMZ), corresponding to a sharp decline of microhardness from PMZ to WZ. The original position of fracture is found at weld toe, where incomplete penetration forms due to the introduction of gradient mismatches.

Original language	English
Pages (from-to)	20-28
Number of pages	9
Journal	China Welding (English Edition)
Volume	26
Issue number	4
DOIs	https://doi.org/10.12073/j.cw.20170904001
State	Published - 25 Dec 2017

Keywords

2219-T6 aluminum alloy
Gradient mismatches
Mechanical properties
Microstructure
VP-TIG

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10.12073/j.cw.20170904001

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title = "The influence of gradient mismatches on mechanical properties and microstructure of 2219-T6 aluminum alloy VP-TIG joints",

abstract = "In this paper, 6 mm thick 2219-T6 aluminum alloy was joined by means of variable polarity tungsten-arc welding (VP-TIG) and the influence of gradient mismatches on VP-TIG joints is investigated. The average tensile strength of the joints reduces 32\%, 53\% and 59\%, when the mismatch of the joint was 0.635 mm, 1.44 mm, 1.83 mm, respectively. Incomplete penetration, additional bending moment (Ma) and decrease of effective load region area are considered to explain this phenomenon. The fracture location of tensile specimens occurred at the weld zone (WZ) close to partial melt zone (PMZ), corresponding to a sharp decline of microhardness from PMZ to WZ. The original position of fracture is found at weld toe, where incomplete penetration forms due to the introduction of gradient mismatches.",

keywords = "2219-T6 aluminum alloy, Gradient mismatches, Mechanical properties, Microstructure, VP-TIG",

author = "Zongliang L{\"u} and Chong Li and Long Wan and Zhenguo Hou and Xiaoxia Chen and Hao Wu and Yongxian Huang",

note = "Publisher Copyright: Copyright: {\textcopyright} 2017 Editorial Board of CHINA WELDING.",

year = "2017",

month = dec,

day = "25",

doi = "10.12073/j.cw.20170904001",

language = "英语",

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TY - JOUR

T1 - The influence of gradient mismatches on mechanical properties and microstructure of 2219-T6 aluminum alloy VP-TIG joints

AU - Lü, Zongliang

AU - Li, Chong

AU - Wan, Long

AU - Hou, Zhenguo

AU - Chen, Xiaoxia

AU - Wu, Hao

AU - Huang, Yongxian

PY - 2017/12/25

Y1 - 2017/12/25

N2 - In this paper, 6 mm thick 2219-T6 aluminum alloy was joined by means of variable polarity tungsten-arc welding (VP-TIG) and the influence of gradient mismatches on VP-TIG joints is investigated. The average tensile strength of the joints reduces 32%, 53% and 59%, when the mismatch of the joint was 0.635 mm, 1.44 mm, 1.83 mm, respectively. Incomplete penetration, additional bending moment (Ma) and decrease of effective load region area are considered to explain this phenomenon. The fracture location of tensile specimens occurred at the weld zone (WZ) close to partial melt zone (PMZ), corresponding to a sharp decline of microhardness from PMZ to WZ. The original position of fracture is found at weld toe, where incomplete penetration forms due to the introduction of gradient mismatches.

AB - In this paper, 6 mm thick 2219-T6 aluminum alloy was joined by means of variable polarity tungsten-arc welding (VP-TIG) and the influence of gradient mismatches on VP-TIG joints is investigated. The average tensile strength of the joints reduces 32%, 53% and 59%, when the mismatch of the joint was 0.635 mm, 1.44 mm, 1.83 mm, respectively. Incomplete penetration, additional bending moment (Ma) and decrease of effective load region area are considered to explain this phenomenon. The fracture location of tensile specimens occurred at the weld zone (WZ) close to partial melt zone (PMZ), corresponding to a sharp decline of microhardness from PMZ to WZ. The original position of fracture is found at weld toe, where incomplete penetration forms due to the introduction of gradient mismatches.

KW - 2219-T6 aluminum alloy

KW - Gradient mismatches

KW - Mechanical properties

KW - Microstructure

KW - VP-TIG

UR - https://www.scopus.com/pages/publications/85041551851

U2 - 10.12073/j.cw.20170904001

DO - 10.12073/j.cw.20170904001

M3 - 文章

AN - SCOPUS:85041551851

SN - 1004-5341

VL - 26

SP - 20

EP - 28

JO - China Welding (English Edition)

JF - China Welding (English Edition)

IS - 4

ER -

The influence of gradient mismatches on mechanical properties and microstructure of 2219-T6 aluminum alloy VP-TIG joints

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