| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for manufacturing an electric resistance welded tube having excellent weld characteristics, which method surely and sufficiently improves weld characteristics (particularly, low temperature toughness). SOLUTION: During a step of forming a strip 110, the end parts of a strip are butted each other, and subjected to electric resistance welding to make a tube. A taper shape is given to the end parts before the electric resistance welding by fin pass forming 3, and a non-oxidizing gas is blown on the end parts being heated by the electric resistance welding. The circumference of the end parts are preferably held to a non-oxidizing atmosphere. COPYRIGHT: (C)2008,JPO&INPIT |
