Abstract: A vehicle-body upper structure includes a roof panel constituting an outer plate of a vehicle-body upper part, a roof side reinforcement provided below, in a vehicle up-down direction, an outer region of the roof panel in the vehicle width direction, and a roof side rail provided in an outer end portion, in the vehicle width direction, of the vehicle-body upper part so as to extend along a vehicle front-rear direction. The roof panel includes an outer joining portion in an outer end portion of the roof panel in a vehicle width direction. The roof side reinforcement includes a rail joining portion and a roof joining portion, and the roof joining portion is joined to a predetermined part of the roof panel. The roof side rail is joined to the outer joining portion of the roof panel and the rail joining portion of the roof side reinforcement.

Abstract: A vehicle rear portion structure includes a cross member that extends in a vehicle width direction at a vehicle rear, a rear wheel house that accommodates a rear tire, a rear pillar that extends in a vehicle vertical direction, a reinforcing member that connects the rear pillar with the rear wheel house, and a joining member that connects a lower end portion of the reinforcing member with one end portion of the cross member. The rear pillar is divided into a general portion and a high-rigidity portion. The high-rigidity portion is connected to an upper end portion of the general portion and is specified with a higher rigidity than the general portion. The reinforcing member is connected to the high-rigidity portion.

Abstract: A vehicle-body upper structure includes a roof panel constituting an outer plate of a vehicle-body upper part, a roof side reinforcement provided below, in a vehicle up-down direction, an outer region of the roof panel in the vehicle width direction, and a roof side rail provided in an outer end portion, in the vehicle width direction, of the vehicle-body upper part so as to extend along a vehicle front-rear direction. The roof panel includes an outer joining portion in an outer end portion of the roof panel in a vehicle width direction. The roof side reinforcement includes a rail joining portion and a roof joining portion, and the roof joining portion is joined to a predetermined part of the roof panel. The roof side rail is joined to the outer joining portion of the roof panel and the rail joining portion of the roof side reinforcement.

Abstract: A vehicle includes a lower back panel, a rear side member, a gusset, a roof side rail, and a coupling member. The lower back panel has an outer panel and a lower back reinforcement, which is joined to the outer panel. The gusset is joined to both the lower back reinforcement and the rear side member. The coupling member is joined to both the rear end of the roof side rail and the lower back reinforcement. When viewed in the vehicle vertical direction, a region of the lower back reinforcement to which the gusset is joined overlaps with a region of the lower back reinforcement to which the coupling member is joined.

Abstract: To obtain a laser joining structure and a laser joining method that can suppress a decrease in strength or rigidity of a third plate that is disposed at an interval apart from at least two metal plates. A laser joining structure has at least two metal plates whose superposed region, at which the at least two metal plates are superposed with one another, is joined by laser welded portions at two or more places, and a third plate that is disposed at an interval apart from the superposed region. A through-portion, that passes-through the third plate and through which laser light is irradiated onto the superposed region and that is of a number that is less than a number of the laser welded portions, is formed in the third plate.

Abstract: A vehicle includes a lower back panel, a rear side member, a gusset, a roof side rail, and a coupling member. The lower back panel has an outer panel and a lower back reinforcement, which is joined to the outer panel. The gusset is joined to both the lower back reinforcement and the rear side member. The coupling member is joined to both the rear end of the roof side rail and the lower back reinforcement. When viewed in the vehicle vertical direction, a region of the lower back reinforcement to which the gusset is joined overlaps with a region of the lower back reinforcement to which the coupling member is joined.

Abstract: A joint structure for a vehicle body member, the vehicle body member including at least two panel members, the at least two panel members constituting part of a vehicle body and being formed of a steel plate, the joint structure includes: spot-welds formed by spot-welding the at least two panel members to each other at a predetermined spot interval such that a predetermined clearance is formed between the at least two panel members; a laser-weld formed by laser-welding the at least two panel members to each other between the spot-welds; and an electrodeposition coating film portion that covers a surface of each of the at least two panel members, at least part of the electrodeposition coating film portion filling the clearance.

Abstract: A vehicle frame structure includes a pair of hat-shaped panels that form a portion of a vehicle, each hat-shaped panel having a hat-shaped cross-section, the pair of hat-shaped panels facing each other and forming a closed sectional portion; a partition panel that is sandwiched by the pair of hat-shaped panels, and divides an inside of the closed sectional portion; and a laser welded portion where all of four or more plates including the pair of hat-shaped panels and the partition panel are overlapped and welded together at an identical position by laser welding.

Abstract: Provided are: a laser-bonded structure wherein deterioration of strength or rigidity of a third plate is suppressed, said third plate being disposed by being spaced apart from at least two metal plates; and a laser bonding method. The laser-bonded structure is provided with: at least two metal plates, which have two or more overlapping portions where the metal plates are disposed in a state wherein the metal plates are overlapping each other, and which are bonded by means of laser welding sections; and a third plate that is disposed by being spaced apart from the overlapping portions. The third plate has formed therein penetrating sections of a number smaller than the number of the laser welding sections, said penetrating sections penetrating the third plate, and having laser light radiated to the overlapping portions.

Abstract: A vehicle frame structure includes a pair of hat-shaped panels that form a portion of a vehicle, each hat-shaped panel having a hat-shaped cross-section, the pair of hat-shaped panels facing each other and forming a closed sectional portion; a partition panel that is sandwiched by the pair of hat-shaped panels, and divides an inside of the closed sectional portion; and a laser welded portion where all of four or more plates including the pair of hat-shaped panels and the partition panel are overlapped and welded together at an identical position by laser welding.

Abstract: A laser joint structure includes a metal outer cylinder, a metal inner member that is provided inside of the outer cylinder, in which a joining portion is arranged following an inner shape of the outer cylinder, the joining portion being arranged contacting or close to the outer cylinder; and a laser weld that is provided on a mating portion of the outer cylinder and a corresponding mating portion of the joining portion, and in which a circular cylindrical nugget is formed by melting the outer cylinder and the joining portion, which is accomplished by emitting a laser light from outside the outer cylinder.

Abstract: A joint structure for a vehicle body member, the vehicle body member including at least two panel members, the at least two panel members constituting part of a vehicle body and being formed of a steel plate, the joint structure includes: spot-welds formed by spot-welding the at least two panel members to each other at a predetermined spot interval such that a predetermined clearance is formed between the at least two panel members; a laser-weld formed by laser-welding the at least two panel members to each other between the spot-welds; and an electrodeposition coating film portion that covers a surface of each of the at least two panel members, at least part of the electrodeposition coating film portion filling the clearance.

Abstract: A vehicle-body member joining structure includes: laser welded portions at which at least two panel members each constituting part of a vehicle body and made of a steel sheet are joined to each other by laser welding in a state where a predetermined gap is formed therebetween; and an electrodeposition coating film portion covering surfaces of the panel members and filling at least part of the gap.