JPS55161591A - Weld crack preventing method of alloy steel - Google Patents

Weld crack preventing method of alloy steel

Info

Publication number
JPS55161591A
JPS55161591A JP6888079A JP6888079A JPS55161591A JP S55161591 A JPS55161591 A JP S55161591A JP 6888079 A JP6888079 A JP 6888079A JP 6888079 A JP6888079 A JP 6888079A JP S55161591 A JPS55161591 A JP S55161591A
Authority
JP
Japan
Prior art keywords
welding
temperature
consumable electrode
fining
heat
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
JP6888079A
Other languages
Japanese (ja)
Inventor
Kyo Matsuzaka
Takatoshi Yoshioka
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.)
Hitachi Ltd
Original Assignee
Hitachi 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 Hitachi Ltd filed Critical Hitachi Ltd
Priority to JP6888079A priority Critical patent/JPS55161591A/en
Publication of JPS55161591A publication Critical patent/JPS55161591A/en
Pending legal-status Critical Current

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  • Arc Welding In General (AREA)

Abstract

PURPOSE: To prevent low-temperature cracking and SR cracking by rapidly heating and cooling the HAZ having hardened and coarsened at the welding of the 1st layer to the Ac1WAc3 transformation points of steel thereby softening and fining the same.
CONSTITUTION: In the multielectrode welding using a consumable electrode and non-consumable electrode, the welding is done by applying the temperature at which the temperatures of the whole or part of the coarse-grained areas of the heat-affected zone become Ac1 (about 750PC)WAc3 (about 850°C) by the succeeding 2nd consumable electrode when the temperature of the coarse-grain hardened area of the heat affected zone formed by the build-up welding of the preceding electrode reaches the Ms point (about 34°C) of steel or less, and this causes the fining of crystal grains. If the heat-affected zone is heated by the 3rd non-consumable electrode so that the temperature of the said zone becomes 750W800°C and the welding is done, the softening and considerable fining are achieved.
COPYRIGHT: (C)1980,JPO&Japio
JP6888079A 1979-06-04 1979-06-04 Weld crack preventing method of alloy steel Pending JPS55161591A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6888079A JPS55161591A (en) 1979-06-04 1979-06-04 Weld crack preventing method of alloy steel

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6888079A JPS55161591A (en) 1979-06-04 1979-06-04 Weld crack preventing method of alloy steel

Publications (1)

Publication Number Publication Date
JPS55161591A true JPS55161591A (en) 1980-12-16

Family

ID=13386406

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6888079A Pending JPS55161591A (en) 1979-06-04 1979-06-04 Weld crack preventing method of alloy steel

Country Status (1)

Country Link
JP (1) JPS55161591A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06198114A (en) * 1993-10-01 1994-07-19 Hitachi Ltd Air cleaner

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06198114A (en) * 1993-10-01 1994-07-19 Hitachi Ltd Air cleaner

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