Toyota Jidosha Kabushiki Kaisha

Jfe Steel Corporation

Masaki Morino

Tatsuya Nakagaito

Kohei Hisada

Yoshikiyo Tamai

Toru Hioki

Toru Minote

Hideaki Kobiki

Yuichi Tokita

Objects to be welded are joined together by laser welding to form adjacent nuggets. When a distance between central axes of the adjacent nuggets is p and a diameter of the adjacent nuggets in the objects to be welded is d, the adjacent nuggets are formed so as to satisfy an equation 1.0&#x3c;p/d&#x2264;1.6.

Welding method and welded structure

A method for manufacturing a hot press formed part, includes: preparing a hot press forming object comprising a single-ply portion and a two-ply portion; heating the hot press forming object to a temperature range from an Actransformation temperature of a base steel sheet of the first coated steel sheet to 1000&#xb0; C.; press forming the hot press forming object to obtain a formed body, the press forming being started upon temperatures of the single-ply portion and of the two-ply portion being no higher than solidification points of Zn&#x2014;Ni coating layers of the first and second coated steel sheets and no lower than an Artransformation temperature of the base steel sheet of the first coated steel sheet; and quenching the formed body to thereby obtain a hot press formed part, in which the hot press forming object has a thickness ratio from 1.4 to 5.0.

Method for manufacturing hot press formed part and hot press formed part

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Toyota, Japan

Masaki Morino