Science and Technology of Welding and Joining

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Effect of different pre- and post-weld heat treatments on microstructures and mechanical properties of variable polarity TIG welded AA2219 joints
Science and Technology of Welding and Joining - Tập 21 Số 3 - Trang 234-241 - 2016
Yutao Lin, D. P. Wang, Mingchao Wang, Yuxuan Zhang, Yun He
The microstructures and mechanical properties of 2219 aluminium alloy joints welded by variable polarity TIG welding in four kinds of different heat treatment conditions, namely, with/without pre-/post-weld heat treatment, were analysed and compared. The post-weld artificial aging treatment rendered fine dispersed precipitates (metastable θ′ phase) separate out of weld metal, which made t...... hiện toàn bộ
Laser beam welding of dissimilar aluminium alloys of 2000 and 7000 series: Effect of post-welding thermal treatments on T joint strength
Science and Technology of Welding and Joining - Tập 14 Số 6 - Trang 484-492 - 2009
Claudio Francesco Badini, Matteo Pavese, Paolo Fino, Sara Biamino
Two experimental aluminium alloys (belonging to 2000 and 7000 series respectively) were welded using the laser beam welding (LBW) technique and an Al–Si alloy as filler. Different combinations of pre- and post-welding thermal treatments were proposed. The change of strength during aging treatments was investigated by microhardness measurements carried out on the weld and on the regions of...... hiện toàn bộ
In situ thermal studies and post-weld mechanical properties of friction stir welds in age hardenable aluminium alloys
Science and Technology of Welding and Joining - Tập 8 Số 4 - Trang 283-288 - 2003
Tracy W. Nelson, Russell Steel, William J. Arbegast
The ‘quench sensitivity’ of various friction stir welded (FSW) aluminium alloys were investigated. Cooling rates of FSW were altered by utilising various active (weld side) and passive (anvil side) cooling/heating conditions. Media used included a chilled water mist (active cooling) and hot air (active heating) immediately behind the tool, and water chilled (passive cooling) or heated (pa...... hiện toàn bộ
Review of laser welding monitoring
Science and Technology of Welding and Joining - Tập 19 Số 3 - Trang 181-201 - 2014
Deyong You, Xiangdong Gao, Seiji Katayama
Laser welding, as a highly efficient processing technology, has been widely applied to manufacturing industry. This paper makes an overview on real time monitoring of laser welding. It begins with a detailed introduction to six typical sensors (photodiode, visual, spectrometer, acoustical sensor, pyrometer, plasma charge sensor) in laser welding detection. Then it makes a review on multi-...... hiện toàn bộ
Effect of welding speed on microstructural and mechanical properties of laser lap weld joints in dissimilar Al and Cu sheets
Science and Technology of Welding and Joining - Tập 19 Số 2 - Trang 111-118 - 2014
Su-Jin Lee, Harumasa Nakamura, Yousuke Kawahito, Seiji Katayama
Conventional fusion welding of aluminium and copper dissimilar materials is difficult because of poor weldability arising from the formation of brittle intermetallic compounds on the weld zone as well as different chemical, mechanical and thermal properties of welded joints. Joining of Al and Cu plates or sheets offers a metallurgical challenge due to unavoidable formation of brittle inte...... hiện toàn bộ
Modulated Nd : YAG laser welding of Ti–6Al–4V
Science and Technology of Welding and Joining - Tập 15 Số 5 - Trang 433-439 - 2010
Jon Blackburn, Charles M. Allen, Paul Hilton, L. Li, M. I. Hoque, Ali Hossain Khan
Modulating the output of Nd : YAG laser sources has been evaluated as a technique for producing high quality welds in titanium alloys. Welds with high internal quality were produced when a square wave form was used with a modulation frequency ≥125 Hz and a duty cycle of 50%. Undercut present in the weld profile can be reduced if the correct combination of modulation amplitude and laser be...... hiện toàn bộ
Residual welding stresses in laser beam and tungsten inert gas weldments of titanium alloy
Science and Technology of Welding and Joining - Tập 10 Số 6 - Trang 643-646 - 2005
J. X. Zhang, Yang Xue, Shui Li Gong
The residual welding stresses in laser beam (LB) and tungsten inert gas (TIG) weldments of a titanium alloy in thin plate form were investigated experimentally in the present work. A hole drilling technique was used to measure the residual stresses in the weldments. The effects of the welding method and post-weld heat treatment (PWHT) on the residual stresses were analysed. The results sh...... hiện toàn bộ
Mechanical properties and strengthening mechanisms in laser beam welds of pure titanium
Science and Technology of Welding and Joining - Tập 16 Số 7 - Trang 581-585 - 2011
H Liu, Kazuya Nakata, Norifumi Yamamoto, Jinsun Liao
The mechanical properties and strengthening mechanisms in laser beam welds of pure titanium were investigated. Although grain coarsening is evidently observed in the heat affected zone (HAZ) and fusion zone (FZ) compared with the base metal (BM), the tensile and hardness tests indicate that the HAZ and FZ are stronger than the BM under the welding conditions employed in the present work. ...... hiện toàn bộ
Investigation on TIG cladding of copper alloy on steel plate
Science and Technology of Welding and Joining - Tập 13 Số 1 - Trang 10-16 - 2008
Shixiong Lv, Zhe Xu, H. T. Wang, Shiqin Yang
Tungsten inert gas cladding of steel substrate with copper alloy under different processing conditions was investigated with the particular emphasis on the influence of cladding current on the concentration and morphology of Fe solute in the cladding layer and the hardness of the Cu/Fe interface. The application of hot wire was helpful to some extent in improving the spreadability of the ...... hiện toàn bộ
Influence of carbon, manganese and nickel on microstructure and properties of strong steel weld metals: Part 1 – Effect of nickel content
Science and Technology of Welding and Joining - Tập 11 Số 1 - Trang 1-8 - 2006
E. Keehan, Leif Karlsson, Hans‐Olof Andrén
The effects of increasing the nickel content from 3 to 7 or 9 wt-% were investigated in high strength steel weld metals with 2 wt-% manganese. Nickel additions were beneficial to strength but detrimental to impact toughness. Significant segregation of nickel and manganese to interdendritic regions was observed at the two higher nickel contents. In these weld metals a mainly martensitic mi...... hiện toàn bộ
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