FILLET WELDED JOINT AND MANUFACTURING METHOD THEREOF

WIPO Patent Application WO/2018/159719

A1

The present invention relates to a fillet welded joint and a manufacturing method thereof, and addresses the problem of providing a fillet welded joint having excellent weld fatigue strength while suppressing low temperature cracking. In a fillet welded joint according to the present invention, a tensile strength of a base material is at least equal to 980 MPa, a carbon equivalent is at least equal to 0.36 and at most equal to 0.60, a tensile strength [MPa] is at least 1950 times the carbon equivalent [wt%], an average carbon equivalent of welded metal is at least equal to 0.45 and at most equal to 0.65, and at a prescribed position below a surface of a weld toe, a Vickers hardness HVbond at a boundary between the welded metal and a heat affected zone, an average value HVwmt of the Vickers hardness of the welded metal at a position at least 0.1 mm and at most 0.3 mm to the welded metal side of the boundary, and an average value HVhaz of the Vickers hardness of the heat affected zone in a position at least 0.1 mm and at most 0.3 mm to the heat affected zone side of the boundary satisfy HVbond≤HVwmt, HVbond≥HVhaz-50, and HVhaz≤350.

JPS54127847	WELDING SILICON STEEL
WO/1997/022433	METHOD FOR JOINING TWO PARTS OF DIFFERENT KINDS BY HETEROGENEOUS BUTT WELDING, AND USES THEREOF

KODAMA SHINJI (JP)
MATSUDA KAZUKI (JP)
ISHIDA YOSHINARI (JP)

PCT/JP2018/007638

September 07, 2018

February 28, 2018

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NIPPON STEEL & SUMITOMO METAL CORP (JP)

B23K9/23; B23K9/02; B23K35/30; C22C38/00; C22C38/06; C22C38/58

WO2017018492A1	2017-02-02
WO2017018492A1	2017-02-02
WO2011037272A1	2011-03-31

JP2007253160A	2007-10-04
JP2010214466A	2010-09-30
JPH101742A	1998-01-06

See also references of EP 3590644A4

AOKI, Atsushi et al. (JP)

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