Abstract: An illustrative system includes a hearing device and a charging device configured to provide a power signal to the hearing device while the hearing device is within a charging range of the charging device. The hearing device and the charging device are configured to establish a primary communication channel between the hearing device and the charging device and participate in an authenticated pairing procedure for the primary communication channel in which authentication information is transmitted from one device to the other by way of a secondary communication channel that allows for communication only over distances that are below a threshold distance.

Abstract: A component made of nodular cast iron is joined to a component made of steel by means of fusion welding, a Fe alloy containing 2 to 4% by weight of silicon and seeding materials for the purpose of globular carbon precipitation in the welding zone being used as filler. Advantageously, the nodular cast iron component is provided beforehand with a build-up welding with Si-alloyed filler or with an unalloyed filler now alloyed with such a Si-alloyed filler, whereupon the weld joining to the steel component can be carried out with conventional iron electrodes.Preferred Si-alloyed filler:C=0.01-0.12% by weight,Mn=0.2-1.5% by weight,Si=1-4% by weight,Al=0.005-0.1% by weight,Mo=0.2-0.7% by weight,Ce=0.0001-0.02% by weight,Mg=0.0001-0.01% by weight,Zr=0.01-0.7% by weight,S=0.006% by weight max.,P=0.01% by weight max.