JPS56114581A - Dc welding on inner surface of pipe - Google Patents

Dc welding on inner surface of pipe

Info

Publication number
JPS56114581A
JPS56114581A JP1600580A JP1600580A JPS56114581A JP S56114581 A JPS56114581 A JP S56114581A JP 1600580 A JP1600580 A JP 1600580A JP 1600580 A JP1600580 A JP 1600580A JP S56114581 A JPS56114581 A JP S56114581A
Authority
JP
Japan
Prior art keywords
welding
magnetic field
pipe body
arc
current
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
JP1600580A
Other languages
Japanese (ja)
Inventor
Yasushi Ishikawa
Taiji Hase
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.)
Nippon Steel Corp
Original Assignee
Nippon Steel 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 Nippon Steel Corp filed Critical Nippon Steel Corp
Priority to JP1600580A priority Critical patent/JPS56114581A/en
Publication of JPS56114581A publication Critical patent/JPS56114581A/en
Pending legal-status Critical Current

Links

Landscapes

  • Butt Welding And Welding Of Specific Article (AREA)
  • Arc Welding Control (AREA)

Abstract

PURPOSE: To prevent magnetization of a pipe body and to stabilize the arc, by applying an arc current in the reverse direction to the welding current, by fitting an earthing cable to the end of the pipe reverse to the progross of welding diection.
CONSTITUTION: The welding current is passed from welding DC power source 6 to power cable 3 of welding torch 2 extended in the opposite direction of welding progress direction 10, and welding on beveling 7 which has not been welded of pipe body 1, is performed with the arc from welding torch 2. When pipe body 1 is welded with DC, the magnetic field generated at the nonwelded beveling section near the arc will be magnetic field HW generated by the welding curreng flowing through the parallel section of pipe body of power cable 3 and magnetic field HA generated by the welding current flowing through the vertical section of pipe body and the current of arc pillar. When the pipe diameter is larger, magnetic field HA is larger than magnetic field HW, and the welding is interrupted. To prevent such interruption, therefore, earthing cable 5a is fitted to the end of pipe and magnetic field HE is formed in the same direction with magnetic field HW by passing the arc current through the inside of pipe body 1 in the opposite direction of welding current. By this, magnetic field HA is negated and magnetization of pipe body 1 is prevented.
COPYRIGHT: (C)1981,JPO&Japio
JP1600580A 1980-02-14 1980-02-14 Dc welding on inner surface of pipe Pending JPS56114581A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP1600580A JPS56114581A (en) 1980-02-14 1980-02-14 Dc welding on inner surface of pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1600580A JPS56114581A (en) 1980-02-14 1980-02-14 Dc welding on inner surface of pipe

Publications (1)

Publication Number Publication Date
JPS56114581A true JPS56114581A (en) 1981-09-09

Family

ID=11904487

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1600580A Pending JPS56114581A (en) 1980-02-14 1980-02-14 Dc welding on inner surface of pipe

Country Status (1)

Country Link
JP (1) JPS56114581A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60130470A (en) * 1983-12-16 1985-07-11 Matsumoto Kikai Kk Dc arc welding method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS60130470A (en) * 1983-12-16 1985-07-11 Matsumoto Kikai Kk Dc arc welding method

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