Robot automated EMPT sheet welding
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Date
2012-07-18
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Abstract
Many industrial applications require sheet to sheet or sheet to tube joints. The
electromagnetic pulse technology is capable to produce these kinds of joints. In literature
many examples of sheet to sheet solid state welding between similar and dissimilar
metals are presented and analyzed in detail. However, the most of the presented welding
applications, which are very focussed on the academic level, are simple specimens for
example for tensile test. These specimens are usually very small in their dimensions and
therewith capable to be welded with the help of stationary EMPT coils. In contrast to this
approach the majority of typical industrial applications demand the ability of manufacturing
several welds in different positions on the same assembly application comparable to the
spot welding process of an automotive car body. Here several spot welds are realised in a
variety of positions by a robot mounted spot welding gun. The use of a stationary coil is no
option here. A first step in manufacturing complex assemblies by EMPT was done by
PSTproducts by welding a car- shaped space frame. Within this project substantial
knowledge has been generated with respect to non stationary EMPT coils and the
flexibility of the cables connecting the coil with the pulse generator. The results were
transferred into the next step, the development of an EMPT robotic welding head. This
report details requirements and possibilities of robot automated EMPT sheet welding with
respect to complex structures.
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Keywords
automation, robotic, wielding