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In page Schunk Group:

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Schunk Sonosystems GmbH came about by merging the firms of Schunk Ultraschalltechnik GmbH and STAPLA Ultraschalltechnik GmbH. The products of this division cover the entire spectrum of welding applications using ultrasonic welding. This likewise includes amalgamation of non-ferrous metals and thermoplastic synthetics. In the late 1970s Schunk developed ultrasonic metal welding to industrial marketability. It is now mainly used to weld cable trees in the automotive industry.[citation needed]