摘要：Steel has been the material of choice for automobile manufacturers. In the recent
years material such as aluminium and its alloys are taking over the market because
of their light weight. The use of aluminium, in automobile manufacturing can result
in overall fuel efficiency. Spot welding aluminium alloys require higher electric power
and less welding time as compared to steel. Welding guns that can produce an
electric current which is approximately 2 to 3 times higher, as compared to steel are
required for spot welding aluminium. An efficient method of spot welding Aluminium
alloys with the preheating process has been proposed in this paper. Preheating
Aluminium sheet before spot welding reduces the thermal and electrical resistance
which brings down the electric current requirement to spot weld Aluminium
structures. Both spot welding and induction preheating process have been modelled in
this paper. The test results of the preheating process have also been verified with
practical heating trials. The preheating is performed on-the-fly in advance to spot
welding process. The results show that spot welding Al 6082 after preheating up to
200
oC, the output current requirements to make the spot weld are reduced by 22%..
关键词：Finite element method; pre heating; resistance spot welding; induction heating;;
aluminium welding.
