Changes

Besides the selection of the most suitable contact materials , the design and typeof attachment is critical for the reliability and electrical life of contactcomponents for electromechanical switching devices. The materials most important factors here are the material-saving useof high cost precious metals and the most economic economical manufacturing method forcontact parts are most important factors..

There are two basic manufacturing solutions available: One can start with singlecontact parts , such as contact rivets or tips , which then are attachedmechanically or by brazing or welding resp. to carrier parts. In the second case, a base material coated or clad with the precious contact metal - for specialapplications also clad with another non-precious material – in the form of stripsor profiles is manufactured as a semi-finished pre-material from which thecontact components are then stamped and formed. Besides mechanicalcladding other processes such as electroplating and deposition from the gasphase are utilized.Which of the following manufacturing processes is finally chosen , depends onthe final application of the contact components in their respective switchingdevices or electromechanical components. Other considerations , such as therequired number of electrical operations, the most economical use of preciousmetals and the anticipated volumes of parts are also important for the processselection.

===3.1 Manufacturing of Single Contact Parts===The group of single contacts includes contact rivets, contact tips, and formedparts such as weld buttons. Contact spheres (or balls) are today rarely usedbecause of economical considerations. <br>

Semi-finished contact pre-materials can be manufactured from solid preciousmetals, precious metal alloys, or precious metal containing composite materials. <br>

===3.3 Attachment of Single Contact Parts===The following segments give an overview of the usually applied attachmenttechnologies for contact parts to carrier components. They include mechanical, as well as brazing and welding methods used for electrical contact assemblies.

Main Articel: [[3.3 Attachment of Single Contact Parts | Attachment of Single Contact Parts]]

===3.4 Main Articel: [[Evaluation of Braze or Weld Joints===The switching properties | Evaluation of brazed and welded contact assemblies is stronglydependent on the quality of the joint between the contact and the carrier. Therequired high quality is evaluated through optical methods, continuous controlof relevant process parameters and by sampling of finished products.Braze or Weld Joints]]

Main Articel==Stamped Contact Parts==Stamped electrical contact parts typically consist of a base carrier material to which a contact material is attached by various methods (<xr id="fig: [[Plated and contact containing pre-stamped strips and stamped parts"/><!--(Fig. 3.4 Evaluation 17)-->). They serve as the important functional components in many switching and electromechanical devices for a broad range of Braze or Weld Joints| Evaluation electrical and electronicapplications. On the one hand, they perform the mostly loss-free electrical current transfer and the closing and opening of Braze or Weld Joints]]electrical circuits, while on the other hand, the contact carriers are important mechanical design components, selected to meet the requirements on electrical, thermal, mechanical and magnetic properties.

===3The increasing miniaturization of electromechanical components requires ever smaller stamped parts with low dimensional tolerances.5 Stamped Contact Parts===Such precisionStamped electrical contact stamped parts typically consist of a base carrier material towhich a contact material is attached by various methods ''(Fig. 3.17)''. They serveas are needed in the important functional components in many automotive technology for highly reliable switching andelectromechanical devices for a broad range of electrical connector performance. In the information and electronicdata processingapplications. On the one hand technology, they perform the mostly loss-free electricalcurrent transfer signals and control impulses with high reliability and serve as the closing interface between electronic and opening of electrical circuitscomponents. In addition the<figure id="fig:Plated and contact carriers are important mechanical design components selected to meetcontaining pre-stamped strips and stamped parts">the requirements on electrical, thermal, mechanical [[File:Plated and contact containing pre-stamped strips and magnetic propertiesstamped parts.jpg|left|thumb|Figure 1: Plated and contact containing pre-stamped strips and stamped parts for different applications]]</figure><br style="clear:both;"/>Main Articel: [[Stamped Contact Parts| Stamped Contact Parts]]

The increasing miniaturization of electromechanical components requires eversmaller stamped parts with low dimensional tolerances. Such precisionstamped parts are needed in the automotive technology for highly reliableswitching and connector performance. In the information and data processingtechnology they transfer signals and control impulses with high reliability andserve as the interface between electronic and electrical components. Fig. 3.17:Plated and contactcontaining pre-stamped strips andstamped parts for differentapplications Main Articel: [[3.5 Stamped Contact Parts| Stamped Contact Parts]]  [[Category:Manufacturing Technologies for Contact Parts|Category]] ===References===