Nippon Steel Corporation

Safie Inc.

Kazuki Matsuda

Shinji Kodama

Yoshinari Ishida

Takeshi Toyoda

Kotaro Watanabe

Hitoshi Nikaido

Takahiro Hashimoto

Yusuke Oba

Masatoshi Tokunaga

Wataru Oniki

Naoaki Kashiwagi

Kohei Nakada

Masayuki Fujisawa

Masakazu Kawazu

Alisson Ninomiya

Soichiro Oki

Yukie Kojima

Yui Yamashita

Kana Tanino

Liye Guo

Hiroaki Otomo

A welded joint comprising: a pair of steel base materials having a sheet thickness of 0.4 to 4.0 mm, and at least one of which has a tensile strength of 780 MPa or more; and a weld metal that welds the pair of steel base materials, wherein, when the weld metal is seen in plan view, a weld toe of the weld metal has peaks and valleys, an average distance in a direction orthogonal to a weld line direction between a top point of a peak and a bottom point of a valley that are adjacent to one another is 3.0 mm or less, and an average number of a total of peaks and valleys, at which the distance in the direction orthogonal to the weld line direction between the top point of the peak and the bottom point of the valley that are adjacent to one another is 0.1 mm to 3.0 mm, is 2 to 30/15 mm, and an automobile component having the welded joint.

Welded joint and automobile component

Hot-rolled steel sheet having a chemical composition including, in mass %, C: 0.02 to 0.20%, Si: 0.01 to 1.50%, Mn: 0.10 to 3.00%, P: 0.10% or less, S: 0.010% or less, Al: 0.005 to 0.100%, Ti: 0.02 to 0.20%, N: 0.001 to 0.010%, Cu: 0 to 0.50%, Ni: 0 to 0.50%, Cr: 0 to 1.00%, Mo: 0 to 0.40%, Nb: 0 to 0.060%, V: 0 to 1.00%, B: 0 to 0.0100%, Ca: 0 to 0.0050%, O: 0.0100% or less, and the balance: Fe and impurities; in which: a steel micro-structure includes, in area %, ferrite: 60 to 80%, and a total of ferrite and bainite: 90% or more; an average of the crystal grain size of ferrite and bainite is 7.0 μm or less, a standard deviation of the crystal grain size is 2.0 μm or less; and a standard deviation of a diameter of Ti carbo-nitrides is 10 nm or less.

Hot-rolled steel sheet and weld joint, and methods for producing same

A system according to an embodiment of the present disclosure is a system for displaying a video captured by a camera connected to a network. The system is configured to set, in response to instructions from a user, a first threshold regarding the number of people staying in a target area and a second threshold regarding a period of time during which the people stay in the target area, measure the number of people staying in the target area and a period of time during which the people stay in the target area, generate a thumbnail showing a video when the number of people staying in the target area for a period of time equal to or longer than the second threshold is equal to or greater than the first threshold, and display the thumbnail generated.

Generating images or timelines based on user-configured thresholds for number of people and staying time in target area

A lap fillet arc welded joint includes: a first steel sheet and a second steel sheet which are overlapped each other, the first steel sheet and the second steel sheet each having a tensile strength of 950 MPa or more; and a weld metal which extends along a corner formed by an upper surface of the first steel sheet and an end surface of the second steel sheet. When: a toe angle of the weld metal is defined as &#x3b2;; the total number of concave portions present on the surface of the weld metal included a range of 0.4 mm or less from a fusion boundary is defined as NA; and the number of concave portions in contact with ferrite grains having a maximum grain size of 10 &#x3bc;m or more is defined as NB, the weld metal satisfies the following conditional expressions (1) and (2) at the same time.0&#xb0;&#x3c;&#x3b2;&#x3c;30&#xb0;&#x2003;&#x2003;(1)&#x2264;0.70&#x2003;&#x2003;(2)(Here, NA is 20 or more).

Lap fillet arc welded joint

The present invention provides a lap fillet arc welding joint including a first metal sheet, a second metal sheet, and a weld bead. A region of the first metal sheet on one end side is bent. In a first direction, a position of a tip end of the bent region of the first metal sheet overlaps a region of the second metal sheet on one end side. In a second direction, an amount of deviation between a central axis of a region connected to the bent region of the first metal sheet and a central axis of the region of the second metal sheet on one end side is &#xbd; times or less of average sheet thicknesses of the first metal sheet and the second metal sheet. A joint portion length is two times or more of the sheet thickness of the second metal sheet.

Lap fillet arc welding joint

In a fillet welded joint a base material tensile strength is 980 MPa or more, a carbon equivalent is 0.36 or more and 0.60 or less, a tensile strength [MPa] is 1950 times or more of the carbon equivalent [wt %], a weld metal average carbon equivalent is 0.45 or more and 0.65 or less, and at a prescribed position below a surface of a weld toe, a Vickers hardness HVbond at a boundary between the weld metal and a heat affected zone, an average value HVwmt of the Vickers hardness of the weld metal in a position 0.1-mm or more and 0.3-mm or less to the weld metal side of the boundary, and an average value HVhaz of the Vickers hardness of the heat affected zone in a position 0.1-mm or more and 0.3-mm or less to the heat affected zone side of the boundary satisfy HVbond&#x2264;HVwmt, HVbond&#x2265;HVhaz-50, and HVhaz&#x2264;350.

Fillet welded joint and method of manufacturing thereof

Growing community of inventors

Tokyo, Japan

Kazuki Matsuda