Fig. 3. Temperature fields on thin plate of conventional GTAW (a), GTAW on
copper backing bar with intensive heat transfer (b), preset temperature field (c)
and temperature field for LSND welding (d)
For clearer quantitative assessment of LSND welding technique,
a systematic investigation was carried out (Refs. 8, 11). Fig. 4 shows
comparisons between the experimentally measured inherent strain
ε
p
x
distributions (Fig. 4, a) and residual stress
σ
x
distributions (Fig. 4, b) after
conventional GTAW (curve 1) and LSND welding (curve 2) of aluminum
plate of 1.5 mm thick. Reductions of either
ε
p
x
or
σ
x
are obvious (as
indicated by curve 2 in comparison with curve 1).
Fig. 4. Comparisons between experimentally measured inherent strains
ε
p
x
(a) an
residual stresses
σ
x
(b) distributions after conventional GTAW (curve 1) and LSN
welding (curve 2) of aluminum plate of 1.5 mm thick (Refs. 8, 11)
96 ISSN 0236-3941. Вестник МГТУ им. Н.Э. Баумана. Сер. “Машиностроение”. 2005. № 4
