The classical joining technologies, for example resistance spot welding, cannot be used in the material mix of today’s car bodies, since the materials are not or only limited thermally compatible. In order to fulfil these requirements, Böllhoff has developed the WELTAC® technology.
Resistance element welding is a further development of resistance spot welding.
Compared to the conventional procedure, a rivet-like resistance element is used as the auxiliary joining part made of a material which is compatible with the base sheet. In the first process stage, the punching of the WELTAC® welding element occurs in the upper material layer(s). Afterwards this component is welded to the lower steel material layer(s) in the second stage of the process.
The main field of application for WELTAC® is the automotive industry – in the body construction.
There are many good reasons for using our products.
Strength and options.
Point by point.
Lightweight materials, like i.e. aluminium, sandwich materials and polymeric materials can be easily joined with steel of all qualities.
WELTAC® is a flexible technology with high demands on joint strength.
In the first process stage, the WELTAC® Automation is based on the proven electric-hydraulic processing system RIVSET® Automation EH.
Already existing resistance spot welding systems of modern car body constructions can be used for the second WELTAC® process stage.
In the first process stage, a rivet-like resistance element, used as the auxiliary joining part made of a material compatible with the base sheet, will be punched in the upper material layer (i.e. aluminium). Afterwards this component is welded to the lower steel material layer in the second stage of the process.
Böllhoff only supplies the WELTAC® elements and the WELTAC® Automation of the first process stage.
Find out more: related downloads.
If you would like to know more, simply download the relevant brochures.
| Title | Language | Version | File | Download | |||
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WELTAC® Resistance element welding for modern multi-material car body design
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English | 05/2019 | 2636 kb / PDF |
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