LAMINATED PIPE EXHAUST CONDUIT WITH LOW PRESSURE SEAL JOINT

摘要

An exhaust conduit for automotive internal combustion engines is disclosed wherein a low-pressure seal joint between pipe sections is used with a laminated pipe to avoid failures of the laminated pipe which have been experienced with prior art joints. The laminated pipe includes at the interface of the laminations a residual quantity of oil-like material which is used in the manufacturing process. When used in an exhaust system with a high-pressure seal joint the material vaporizes under the influence of the hot exhaust gases and the vapor pressure thereof causes separation of the laminations, collapse of the inner lamination or other failure of the pipe. A low-pressure seal over a band of engagement in the joint is effective to prevent leakage of the exhaust gases and at the same time to allow vaporized material between the laminations to escape through the end of the laminated pipe.