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
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 the hardne...
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
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 the allo...
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
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
(passive hea...
Review of laser welding monitoring
Science and Technology of Welding and Joining - Tập 19 Số 3 - Trang 181-201 - 2014
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-sensor fu...
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
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 intermetallic...
Modulated Nd : YAG laser welding of Ti–6Al–4V
Science and Technology of Welding and Joining - Tập 15 Số 5 - Trang 433-439 - 2010
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 beam focal ...
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
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 show that (...
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
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.
The stren...
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
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
filler me...
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
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 microstruct...
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