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

被引：63
作者：
Junaid, M. [1 ]
Baig, M. N. [2 ]
Shamir, M. [3 ]
Khan, F. N. [4 ]
Rehman, K. [1 ]
Haider, J. [5 ]
机构：
[1] GIK Inst Engn Sci & Technol, Fac Mech Engn, Topi, Kpk, Pakistan
[2] Pakistan Welding Inst, POB 1781, Islamabad, Pakistan
[3] Natl Univ Sci & Technol, Sch Chem & Mat Engn, H-12, Islamabad, Pakistan
[4] GIK Inst Engn Sci & Technol, Fac Mat Sci & Engn, Topi, Kpk, Pakistan
[5] Manchester Metropolitan Univ, Sch Engn, Manchester M1 5GD, Lancs, England
来源：
JOURNAL OF MATERIALS PROCESSING TECHNOLOGY | 2017年 / 242卷
关键词：
Titanium alloy; Pulsed laser welding; Pulsed TIG welding; Residual stresses; Hole-drill method; Deformation; COMMERCIALLY PURE TITANIUM; RESIDUAL-STRESSES; MECHANICAL-PROPERTIES; TI-6AL-4V ALLOY; HEAT-TREATMENT; MICROSTRUCTURE; JOINTS; PHASE; BEAM; PREDICTION;
D O I：
10.1016/j.jmatprotec.2016.11.018
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
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 alpha' martensitic transformation in fusion zone whereas in P-TIG weldment alpha' and acicular alpha was formed within equiaxed beta 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. (C) 2016 Elsevier B.V. All rights reserved.
引用
收藏
页码：24 / 38
页数：15
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