Abstract
In the last few years the use of robot welding processes has
increased significatnly. The programming of the robots has until
now mainly focused on high efficiency, i.e.high torch rate time,
and hence, minimising the inefficient "travelling" time. Together
with developing high-performance welding equipments,procedures
should also be made for controlling and/or reducing the necessity
of corrections owing to thermal deformation, such as straightening
and adjustment work. The expenses of reworking remain an important
part of the production cost. These inaccuracies partly arise from
thermal deformation due to cutting and welding and parlty in the
form of dimensional variation due to human factors. Measurements
have been made of the production line for assemblies. The
measurements show that distortions related to the multirobot
welding are a factor which can rather easily be controlled by an
optimised welding order. Welding test samples prove that the
constraint of the sample and the time between each pass in a
multipass weld affect the magnitude of distortion. Experiments
with welding specimens in the form of butt-and fillet welds have
been carried out. They show angular deflections as well. A finite
element program has been used to simulate a one-sided fillet weld.
The simulation agrees reasonably with the measurements. The
analysis is divided into two tasks: temperature distribution and
non-linear elalstic-plastic behaviour of the material. The
temperature distribution is found by use of Rosenthal's analytical
solution for a 2D finite plate. The temperature profile is used in
an FE-model, which solves the mechanical problem. Finally, a
simple analytical expression has been set up to calculate the
bending of a rectangular plate by an asymmetric temperature
profile.
Original language | English |
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Title of host publication | ICCAS'97. 9th International Conference on Computer Applications in Shipbuilding |
Place of Publication | Yokohama |
Publisher | The Society of Naval Architects of Japan |
Publication date | 1997 |
Publication status | Published - 1997 |
Event | 9th International Conference on Computer Applications in
Shipbuilding - Yokohama Duration: 1 Jan 1997 → … |
Conference
Conference | 9th International Conference on Computer Applications in Shipbuilding |
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City | Yokohama |
Period | 01/01/1997 → … |