Flexible duct element e.g. decoupling element for exhaust system of motor vehicle e.g. van with combustion engine, performs cohesive connection of adjacent coils in trough by welding process

摘要

The duct element (1) is made of a wound profiled strip and is formed as a winding tube with shaft profile. The cohesive connection (S) of adjacent coils (2,3) in the trough (4) is performed by welding process. The strip material is coated in sections of overlapping area of adjacent coils by titration or nitridation process.