JPS55158224A - Hardening method for inner surface of pipe - Google Patents

Hardening method for inner surface of pipe

Info

Publication number
JPS55158224A
JPS55158224A JP6524579A JP6524579A JPS55158224A JP S55158224 A JPS55158224 A JP S55158224A JP 6524579 A JP6524579 A JP 6524579A JP 6524579 A JP6524579 A JP 6524579A JP S55158224 A JPS55158224 A JP S55158224A
Authority
JP
Japan
Prior art keywords
pipe
electrode
hardened
steel
fluid
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP6524579A
Other languages
Japanese (ja)
Other versions
JPS591770B2 (en
Inventor
Toshiaki Morichika
Takao Mihara
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kubota Corp
Original Assignee
Kubota Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kubota Corp filed Critical Kubota Corp
Priority to JP6524579A priority Critical patent/JPS591770B2/en
Publication of JPS55158224A publication Critical patent/JPS55158224A/en
Publication of JPS591770B2 publication Critical patent/JPS591770B2/en
Expired legal-status Critical Current

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C21—METALLURGY OF IRON
    • C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
    • C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
    • C21D9/08—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for tubular bodies or pipes

Landscapes

  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Heat Treatment Of Articles (AREA)

Abstract

PURPOSE:To prevent the wear of a steel pipe because of friction with fluid, by quenching the inner surface of the steel pipe such as a penstock which has been melted by arc heat so as to harden the inner surface of the steel pipe. CONSTITUTION:Inner surface, which needs to be hardened, of a pipe 1 made of carbon steel or low alloy steel, or inner surface of joined part of the pipes, is hardened in order to prevent the wear caused by the passage of fluid. For that purpose, an electrode 3 of a TIG welding set 2 is arranged at the inside of the pipe 1 with the electrode 3 directed to the inner surface. An electric arc is generated between the electrode 3 and the inner surface of the pipe 1 while revolving the pipe 1 at a low speed around the axis, and at the same time while spraying Ar gas through a nozzle 5 which surrounds the electrode 3 thereby melting locally the inner surface of the pipe. The melted portion is exposed to air and is cooled rapidly by the revolution of the pipe to form martensite structure and hardened. This pipe hardly wears by the passage of fluid, so that the life time of a penstock is extended.
JP6524579A 1979-05-26 1979-05-26 Internal hardening method for pipes Expired JPS591770B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6524579A JPS591770B2 (en) 1979-05-26 1979-05-26 Internal hardening method for pipes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6524579A JPS591770B2 (en) 1979-05-26 1979-05-26 Internal hardening method for pipes

Publications (2)

Publication Number Publication Date
JPS55158224A true JPS55158224A (en) 1980-12-09
JPS591770B2 JPS591770B2 (en) 1984-01-13

Family

ID=13281326

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6524579A Expired JPS591770B2 (en) 1979-05-26 1979-05-26 Internal hardening method for pipes

Country Status (1)

Country Link
JP (1) JPS591770B2 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5848628A (en) * 1982-09-06 1983-03-22 Kubota Ltd Hardening method for inside surface of steel pipe by plasma jet
JPS5947330A (en) * 1982-09-11 1984-03-17 Kubota Ltd Hardening method of inside surface of steel pipe by plasma jet

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5848628A (en) * 1982-09-06 1983-03-22 Kubota Ltd Hardening method for inside surface of steel pipe by plasma jet
JPS5947330A (en) * 1982-09-11 1984-03-17 Kubota Ltd Hardening method of inside surface of steel pipe by plasma jet
JPS6210286B2 (en) * 1982-09-11 1987-03-05 Kubota Ltd

Also Published As

Publication number Publication date
JPS591770B2 (en) 1984-01-13

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