US 12,109,603 B2
Electrical heating apparatus
Akihiro Ide, Ehime (JP); Masayuki Ishizuka, Ehime (JP); Masayuki Saika, Ehime (JP); Kimihiro Nogiwa, Ehime (JP); and Norieda Ueno, Tokyo (JP)
Assigned to SUMITOMO HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed by SUMITOMO HEAVY INDUSTRIES, LTD., Tokyo (JP)
Filed on Aug. 28, 2020, as Appl. No. 17/006,380.
Application 17/006,380 is a continuation of application No. PCT/JP2019/005138, filed on Feb. 13, 2019.
Claims priority of application No. 2018-039362 (JP), filed on Mar. 6, 2018.
Prior Publication US 2020/0391273 A1, Dec. 17, 2020
Int. Cl. H05B 3/03 (2006.01); B21D 26/033 (2011.01); B21D 37/16 (2006.01); C21D 1/40 (2006.01); C21D 1/673 (2006.01); C21D 7/13 (2006.01); C21D 11/00 (2006.01)
CPC B21D 37/16 (2013.01) [B21D 26/033 (2013.01); C21D 1/40 (2013.01); C21D 1/673 (2013.01); C21D 7/13 (2013.01); C21D 11/00 (2013.01); H05B 3/03 (2013.01)] 15 Claims
OG exemplary drawing
 
1. An electrical heating apparatus for supplying electric power to a metal pipe material to electrically heat the metal pipe material, the electrical heating apparatus comprising:
at least two electrodes that come into contact with the metal pipe material;
a power supply unit that supplies electric power to the electrodes;
a warning unit that issues a warning that abnormality has occurred in the electrical heating of the metal pipe material; and
an abnormality detection unit that detects abnormality of the electrodes,
wherein the abnormality detection unit includes
a resistance value acquisition unit that acquires a resistance value between the electrodes, and
an abnormality determination unit that determines that abnormality has occurred in the electrodes, in a state where the electrodes and the metal pipe material are in contact with each other, and controls the warning unit to issue a warning that abnormality has occurred in the electrodes, in a case where the resistance value reaches a predetermined setting value.