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Effects of laser phase transformation hardening parameters on heat input and hardened-bead profile quality of unalloyed titanium 被引量:4
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作者 D.S.BADKAR K.S.PANDEY g.buvanashekaran 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2010年第6期1078-1091,共14页
Laser transformation hardening(LTH)of unalloyed titanium of 1.6 mm-thick sheet,nearer to ASTM Grade 3 of chemical composition was investigated using 2 kW CW Nd:YAG laser.The effects of laser power(750-1 250 W),scannin... Laser transformation hardening(LTH)of unalloyed titanium of 1.6 mm-thick sheet,nearer to ASTM Grade 3 of chemical composition was investigated using 2 kW CW Nd:YAG laser.The effects of laser power(750-1 250 W),scanning speed(1 000-3 000 mm/min)and focal point position(from-10 to-30 mm)on the heat input,and hardened-bead geometry(i.e.hardened bead width(HBW),hardened depth(HD)and angle of entry of hardened bead profile with the surface(AEHB))were investigated using response surface methodology(RSM).The experimental plan is based on Box-Behnken design matrix method.Linear and quadratic polynomial equations for predicting the heat input and the hardened bead geometry were developed.The results indicate that the proposed models predict the responses adequately within the limits of hardening parameters being used.It is suggested that regression equations can be used to find optimum hardening conditions for desired criteria. 展开更多
关键词 laser transformation hardening response surface methodology(RSM) unalloyed titanium TITANIUM hardened-bead profile
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Characterization of magnetically impelled arc butt welded T11 tubes for high pressure applications 被引量:3
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作者 R.SIVASANKARI V.BALUSAMY +2 位作者 P.R.VENKATESWARAN g.buvanashekaran K.GANESH KUMAR 《Defence Technology(防务技术)》 SCIE EI CAS CSCD 2015年第3期244-254,共11页
Magnetically impelled arc butt(MIAB) welding is a pressure welding process used for joining of pipes and tubes with an external magnetic field affecting arc rotation along the tube circumference. In this work, MIAB we... Magnetically impelled arc butt(MIAB) welding is a pressure welding process used for joining of pipes and tubes with an external magnetic field affecting arc rotation along the tube circumference. In this work, MIAB welding of low alloy steel(T11) tubes were carried out to study the microstructural changes occurring in thermo-mechanically affected zone(TMAZ). To qualify the process for the welding applications where pressure could be up to 300 bar, the MIAB welds are studied with variations of arc current and arc rotation time. It is found that TMAZ shows higher hardness than that in base metal and displays higher weld tensile strength and ductility due to bainitic transformation. The effect of arc current on the weld interface is also detailed and is found to be defect free at higher values of arc currents. The results reveal that MIAB welded samples exhibits good structural property correlation for high pressure applications with an added benefit of enhanced productivity at lower cost.The study will enable the use of MIAB welding for high pressure applications in power and defence sectors. 展开更多
关键词 磁控电弧 磁场影响 高压力 应用 压力焊接 特性 对焊 驱动
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