JPS6466078A - Heat treatment of weld joint part excellent in strength and stiffness - Google Patents

Heat treatment of weld joint part excellent in strength and stiffness

Info

Publication number
JPS6466078A
JPS6466078A JP22142787A JP22142787A JPS6466078A JP S6466078 A JPS6466078 A JP S6466078A JP 22142787 A JP22142787 A JP 22142787A JP 22142787 A JP22142787 A JP 22142787A JP S6466078 A JPS6466078 A JP S6466078A
Authority
JP
Japan
Prior art keywords
steel
joint part
weld joint
stiffness
transformation point
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.)
Pending
Application number
JP22142787A
Other languages
Japanese (ja)
Inventor
Motoaki Suzuki
Shigeru Endo
Toyofumi Kitada
Eiji Morishige
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.)
JFE Engineering Corp
Original Assignee
NKK Corp
Nippon Kokan Ltd
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 NKK Corp, Nippon Kokan Ltd filed Critical NKK Corp
Priority to JP22142787A priority Critical patent/JPS6466078A/en
Publication of JPS6466078A publication Critical patent/JPS6466078A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To improve strength and stiffness by subjecting a steel to butt resistance welding, holding a weld joint part by heating it more than the AC3 transformation point of the steel rapidly cooling the weld joint part at the specified cooling speed and annealing to the temp. of >= the specified temp. and <= the AC1 transformation point of the steel. CONSTITUTION:Steel tubes 10, 12 are supported so that the end faces are mutually faced, the tube 10 is fixed on the tube 12 is movable. Electrodes 14, 16 are fitted to the steel tubes 10, 12 and a current is fed by a transformer 18 and control device 20. The specified flashing current is passed in the gap of the tubes 10, 12, the mutual end faces are heated and after electrifying them as they are a large current is passed for several second with upsetting the pipe 12 on the pipe 10 and the electrification is stopped. The weld joint part is thereafter held by heating at >= the AC3 transformation point of the steel by a gas flame, etc., in succession rapidly cooled at the cooling speed of >=5 deg.C/min and by annealing it to the temp. of >=00 deg.C and <= the AC1 transformation point of the steel the weld joint part excellent in the strength and stiffness is obtd.
JP22142787A 1987-09-04 1987-09-04 Heat treatment of weld joint part excellent in strength and stiffness Pending JPS6466078A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22142787A JPS6466078A (en) 1987-09-04 1987-09-04 Heat treatment of weld joint part excellent in strength and stiffness

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22142787A JPS6466078A (en) 1987-09-04 1987-09-04 Heat treatment of weld joint part excellent in strength and stiffness

Publications (1)

Publication Number Publication Date
JPS6466078A true JPS6466078A (en) 1989-03-13

Family

ID=16766572

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22142787A Pending JPS6466078A (en) 1987-09-04 1987-09-04 Heat treatment of weld joint part excellent in strength and stiffness

Country Status (1)

Country Link
JP (1) JPS6466078A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5422710A (en) * 1992-02-14 1995-06-06 Mita Industrial Co., Ltd. Sheet discharging device for use in an image forming apparatus

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5143985A (en) * 1974-10-12 1976-04-15 Kec Kk
JPS5819438A (en) * 1981-07-28 1983-02-04 Sumitomo Metal Ind Ltd Production of steel pipe having high strength and high toughness
JPS5943826A (en) * 1982-09-04 1984-03-12 Sumitomo Metal Ind Ltd Manufacture of high toughness electric welded steel pipe

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5143985A (en) * 1974-10-12 1976-04-15 Kec Kk
JPS5819438A (en) * 1981-07-28 1983-02-04 Sumitomo Metal Ind Ltd Production of steel pipe having high strength and high toughness
JPS5943826A (en) * 1982-09-04 1984-03-12 Sumitomo Metal Ind Ltd Manufacture of high toughness electric welded steel pipe

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5422710A (en) * 1992-02-14 1995-06-06 Mita Industrial Co., Ltd. Sheet discharging device for use in an image forming apparatus

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