Method for joining of at least two unweldable materials, non-weldable directly to each other with thermal joining processes in a lap joint configuration, where a two step sequence is used consisting of a first step to apply a thermomechanical or mechanical surface protection layer on the surface of an unweldable material and a second step, where a thermal joining process is used to joint the sprayed layer with an applied layer sheet.

Method for joining of at least two unweldable materials, non-weldable directly to each other with thermal joining processes in a lap joint configuration, where a two step sequence is used consisting of a first step to apply a thermomechanical or mechanical surface protection layer on the surface of an unweldable material and a second step, where a thermal joining process is used to joint the sprayed layer with an applied layer sheet.

An electric resistance welded steel pipe, and a method for manufacturing the same are provided. An electric resistance welded steel pipe has a welded portion that includes a heat-affected zone having a steel microstructure principally including a bainitic ferrite phase and/or a bainite phase. The steel microstructure at half the wall thickness includes a bainitic ferrite phase and/or a bainite phase in a total area ratio of 90% or more. In the steel microstructure located 1 mm in the wall thickness direction, the bainitic ferrite phase and/or the bainite phase has an average grain size of 20 μm or less. The average grain size of the bainitic ferrite phase and/or the bainite phase located 1 mm in the wall thickness direction is 0.5 times or more and 2 times or less the average grain size of the bainitic ferrite phase and/or the bainite phase at half the wall thickness.

The invention relates to a method for manufacturing a sandwich panel as a semi-finished product where at least one layer of a non-metallic material is positioned between at least two metallic layers. At least one of the metal layers is shaped into a three dimensional layer, and the metal layers are in direct mechanical contact to enable resistance weldability of the semi-finished product in order to connect the semi-finished product to a desired combination of solutions in a subsequent manufacturing process.

A welding system including a welding electrode, a closed-loop cooling device, and a vent. The closed-loop cooling device is configured to cool the welding electrode. The closed-loop cooling device includes a pump and a water line. The vent is located along a path of the water line. The vent is configured to release air trapped within the water line.

Provided is a seam welding device capable of seam welding various shapes of objects to be welded. A seam welding device which performs seam welding by causing electricity to be conducted between a first electrode wheel and a second electrode wheel comprises a first motor which drives the first electrode wheel, a second motor which drives the second electrode wheel, and a first belt provided between the first electrode wheel and the first motor. If a direction joining the axes of the first electrode wheel and the second electrode wheel is defined as a vertical direction, the direction from the first electrode wheel toward the second electrode wheel is upward, and the direction from the second electrode wheel toward the first electrode wheel is downward, then the first motor is disposed further upward than a point of contact of the first electrode wheel and the second electrode wheel.

Provided is a seam welding device capable of seam welding various shapes of objects to be welded. A seam welding device which performs seam welding by causing electricity to be conducted between a first electrode wheel and a second electrode wheel comprises a first motor which drives the first electrode wheel, a second motor which drives the second electrode wheel, and a first belt provided between the first electrode wheel and the first motor. If a direction joining the axes of the first electrode wheel and the second electrode wheel is defined as a vertical direction, the direction from the first electrode wheel toward the second electrode wheel is upward, and the direction from the second electrode wheel toward the first electrode wheel is downward, then the first motor is disposed further upward than a point of contact of the first electrode wheel and the second electrode wheel.

Distance to the upper face of workpieces W sandwiched between electrode rollers 15 and 16 is measured by a range sensor 41 that has a predetermined positional relationship with the electrode rollers 15 and 16 (STEPs 1, 3). Correction is made based on the distance found by the range sensor 41 by moving the pair of electrode rollers 15, 16 with reference to the workpieces W so that an angle Rx between a straight line L0 connecting centers of the pair of electrode rollers 15, 16 and the surface of the plurality of workpieces W is preset angle (STEP 5).

Distance to the upper face of workpieces W sandwiched between electrode rollers 15 and 16 is measured by a range sensor 41 that has a predetermined positional relationship with the electrode rollers 15 and 16 (STEPs 1, 3). Correction is made based on the distance found by the range sensor 41 by moving the pair of electrode rollers 15, 16 with reference to the workpieces W so that an angle Rx between a straight line L0 connecting centers of the pair of electrode rollers 15, 16 and the surface of the plurality of workpieces W is preset angle (STEP 5).

A vehicle structural component is provided having a substrate with one or more patches applied thereto. The thickness of the structural component is thicker and has added stiffness at the locations of the patches. The patches are bonded to the substrate via full surface bonding. The full surface bonding may be achieved via brazing, resistance seam welding, or adhesive bonding. A bonding layer may be disposed between the patches and the substrate. The patches and the substrate may be bonded via resistance seam welding, where a current and pressure are applied by weld wheels. The patches may be applied to the substrate in the form of a blank, or may be applied after the substrate has been formed and shaped into the vehicle component. The fully bonded patches provide comparable stiffness as a solid material having the same thickness.