To provide a manufacturing method which is suitable to application to the manufacture of an electric resistance welded aluminum tube of ≥2 mm thick the electric resistance welded part of which is mostly free from weld defects and a method by which the electric resistance welded aluminum tubes and electric resistance welded steel tube consisting of steel materials are separately manufactured.
When the thickness of the plate of a base stock consisting of aluminum or an aluminum alloy is expressed by t (mm), the frequency of a high-frequency current of high-frequency heating means which is used for heating the end face to be welded for melting by f (kHz), a distance from the end on the downstream side of a work coil comprising the high-frequency heating means to a position corresponding to the axial center of a squeeze roll by L (m) and welding speed by V (m/min), butt welding is executed under conditions simultaneously satisfying formulas f≤400/t and V/L≥1,000/f1/2.
TAKAMADATE CHIHARU
UEZONO TATSUHIKO
MURASHIGE YASUTAKE
INOUE SABURO
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