MANUFACTURING METHOD OF THE EXHAUST PIPE

摘要

The present invention relates to a manufacturing method of an exhaust pipe covered with an insulation layer and, in particular, the manufacturing method of an exhaust pipe covered with an insulation layer can weld a pipe without an external leakage of an insulation while covering the insulation arranged on an outer circumferential surface of an exhaust pipe bent in a certain shape without a welding defect such as combustion, discoloration, carbonization, deformation, etc. of a cover of a thin film metal sheet.