A comparative study of pulsed laser and pulsed TIG welding of Ti-5Al-2.5Sn titanium alloy sheet

M. Junaid; M. N. Baig; M. Shamir; F. N.  Khan; K. Rehman; J. Haider

doi:10.1016/j.jmatprotec.2016.11.018

A comparative study of pulsed laser and pulsed TIG welding of Ti-5Al-2.5Sn titanium alloy sheet

M. Junaid, M. N. Baig^*, M. Shamir, F. N. Khan, K. Rehman, J. Haider

^*Corresponding author for this work

Naval Architecture, Ocean And Marine Engineering

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Abstract

Pulsed Nd:YAG laser beam welding (P-LBW) and pulsed tungsten inert gas (P-TIG) welding were used to prepare full penetration bead-on-plate weldments of 1.6 mm thick Ti-5Al-2.5Sn alpha titanium alloy sheet. The influence of welding phenomenon on the microstructure, micro-hardness, tensile properties, surface and sub-surface residual stress distribution and deformation and distortion of both the weldments were studied. Higher cooling rate in P-LBW resulted in complete α’ martensitic transformation in fusion zone whereas in P-TIG weldment α’ and acicular α was formed within equiaxed β matrix due to lower cooling rate. Hardness in fusion zone of P-LBW was higher than that of the fusion zone of P-TIG weldment due to faster cooling rate in P-LBW. The welded zone in both the weldments showed higher hardness and strength than that of the parent metal since a ductile fracture occurred in the un-welded section during tensile testing. Residual stresses in both P-LBW and P-TIG weldments showed similar trend but the distribution was much narrower in P-LBW due to less width of heat affected zone. P-LBW resulted in more nonuniformity in through thickness stress profile because of greater top to bottom width ratio. Less residual stresses, deformation and distortion and superior mechanical properties in P-LBW made the process more feasible than P-TIG for the welding of Ti-5Al-2.5Sn alloy sheet.

Original language	English
Pages (from-to)	24-38
Number of pages	15
Journal	Journal of Materials Processing Technology
Volume	242
DOIs	https://doi.org/10.1016/j.jmatprotec.2016.11.018
Publication status	Published - 1 Apr 2017

Funding

The authors would like to thank Ghulam Ishaq Khan Institute of Engineering Sciences and Technology (GIKI) for providing financial assistance and Pakistan Welding Institute (PWI) and Pakistan Institute of Engineering and Applied Sciences (PIEAS) for use of facilities.

Keywords

deformation
hole-drill method
pulsed laser welding
pulsed TIG welding
residual stresses
titanium alloy
comparative study

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10.1016/j.jmatprotec.2016.11.018

Junaid-etal-JMPT2017-A-comparative-study-pulsed-laser-pulsed-TIG-welding-Ti-5Al-2.5Sn-titanium-alloy-sheetAccepted author manuscript, 5.96 MBLicence: CC BY-NC-ND 4.0

Cite this

@article{489f04b6662d43f58b57c0b2a0eda207,

title = "A comparative study of pulsed laser and pulsed TIG welding of Ti-5Al-2.5Sn titanium alloy sheet",

abstract = "Pulsed Nd:YAG laser beam welding (P-LBW) and pulsed tungsten inert gas (P-TIG) welding were used to prepare full penetration bead-on-plate weldments of 1.6 mm thick Ti-5Al-2.5Sn alpha titanium alloy sheet. The influence of welding phenomenon on the microstructure, micro-hardness, tensile properties, surface and sub-surface residual stress distribution and deformation and distortion of both the weldments were studied. Higher cooling rate in P-LBW resulted in complete α{\textquoteright} martensitic transformation in fusion zone whereas in P-TIG weldment α{\textquoteright} and acicular α was formed within equiaxed β matrix due to lower cooling rate. Hardness in fusion zone of P-LBW was higher than that of the fusion zone of P-TIG weldment due to faster cooling rate in P-LBW. The welded zone in both the weldments showed higher hardness and strength than that of the parent metal since a ductile fracture occurred in the un-welded section during tensile testing. Residual stresses in both P-LBW and P-TIG weldments showed similar trend but the distribution was much narrower in P-LBW due to less width of heat affected zone. P-LBW resulted in more nonuniformity in through thickness stress profile because of greater top to bottom width ratio. Less residual stresses, deformation and distortion and superior mechanical properties in P-LBW made the process more feasible than P-TIG for the welding of Ti-5Al-2.5Sn alloy sheet.",

keywords = "deformation, hole-drill method, pulsed laser welding, pulsed TIG welding, residual stresses, titanium alloy, comparative study",

author = "M. Junaid and Baig, {M. N.} and M. Shamir and Khan, {F. N.} and K. Rehman and J. Haider",

note = "Funding Information: The authors would like to thank Ghulam Ishaq Khan Institute of Engineering Sciences and Technology (GIKI) for providing financial assistance and Pakistan Welding Institute (PWI) and Pakistan Institute of Engineering and Applied Sciences (PIEAS) for use of facilities. Publisher Copyright: {\textcopyright} 2016 Elsevier B.V.",

year = "2017",

month = apr,

day = "1",

doi = "10.1016/j.jmatprotec.2016.11.018",

language = "English",

volume = "242",

pages = "24--38",

journal = "Journal of Materials Processing Technology",

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T1 - A comparative study of pulsed laser and pulsed TIG welding of Ti-5Al-2.5Sn titanium alloy sheet

AU - Junaid, M.

AU - Baig, M. N.

AU - Shamir, M.

AU - Khan, F. N.

AU - Rehman, K.

AU - Haider, J.

N1 - Funding Information: The authors would like to thank Ghulam Ishaq Khan Institute of Engineering Sciences and Technology (GIKI) for providing financial assistance and Pakistan Welding Institute (PWI) and Pakistan Institute of Engineering and Applied Sciences (PIEAS) for use of facilities. Publisher Copyright: © 2016 Elsevier B.V.

PY - 2017/4/1

Y1 - 2017/4/1

N2 - Pulsed Nd:YAG laser beam welding (P-LBW) and pulsed tungsten inert gas (P-TIG) welding were used to prepare full penetration bead-on-plate weldments of 1.6 mm thick Ti-5Al-2.5Sn alpha titanium alloy sheet. The influence of welding phenomenon on the microstructure, micro-hardness, tensile properties, surface and sub-surface residual stress distribution and deformation and distortion of both the weldments were studied. Higher cooling rate in P-LBW resulted in complete α’ martensitic transformation in fusion zone whereas in P-TIG weldment α’ and acicular α was formed within equiaxed β matrix due to lower cooling rate. Hardness in fusion zone of P-LBW was higher than that of the fusion zone of P-TIG weldment due to faster cooling rate in P-LBW. The welded zone in both the weldments showed higher hardness and strength than that of the parent metal since a ductile fracture occurred in the un-welded section during tensile testing. Residual stresses in both P-LBW and P-TIG weldments showed similar trend but the distribution was much narrower in P-LBW due to less width of heat affected zone. P-LBW resulted in more nonuniformity in through thickness stress profile because of greater top to bottom width ratio. Less residual stresses, deformation and distortion and superior mechanical properties in P-LBW made the process more feasible than P-TIG for the welding of Ti-5Al-2.5Sn alloy sheet.

AB - Pulsed Nd:YAG laser beam welding (P-LBW) and pulsed tungsten inert gas (P-TIG) welding were used to prepare full penetration bead-on-plate weldments of 1.6 mm thick Ti-5Al-2.5Sn alpha titanium alloy sheet. The influence of welding phenomenon on the microstructure, micro-hardness, tensile properties, surface and sub-surface residual stress distribution and deformation and distortion of both the weldments were studied. Higher cooling rate in P-LBW resulted in complete α’ martensitic transformation in fusion zone whereas in P-TIG weldment α’ and acicular α was formed within equiaxed β matrix due to lower cooling rate. Hardness in fusion zone of P-LBW was higher than that of the fusion zone of P-TIG weldment due to faster cooling rate in P-LBW. The welded zone in both the weldments showed higher hardness and strength than that of the parent metal since a ductile fracture occurred in the un-welded section during tensile testing. Residual stresses in both P-LBW and P-TIG weldments showed similar trend but the distribution was much narrower in P-LBW due to less width of heat affected zone. P-LBW resulted in more nonuniformity in through thickness stress profile because of greater top to bottom width ratio. Less residual stresses, deformation and distortion and superior mechanical properties in P-LBW made the process more feasible than P-TIG for the welding of Ti-5Al-2.5Sn alloy sheet.

KW - deformation

KW - hole-drill method

KW - pulsed laser welding

KW - pulsed TIG welding

KW - residual stresses

KW - titanium alloy

KW - comparative study

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U2 - 10.1016/j.jmatprotec.2016.11.018

DO - 10.1016/j.jmatprotec.2016.11.018

M3 - Article

AN - SCOPUS:84996503599

SN - 0924-0136

VL - 242

SP - 24

EP - 38

JO - Journal of Materials Processing Technology

JF - Journal of Materials Processing Technology

ER -

A comparative study of pulsed laser and pulsed TIG welding of Ti-5Al-2.5Sn titanium alloy sheet

Abstract

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Keywords

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