Abstract:
A laser welded joint has weld metal provided between a plurality of steel sheets. A chemical composition of the weld metal has predetermined components, and average hardness of the weld metal is 350 to 540 in Vickers hardness. In the weld metal, distribution density of porosities having a diameter of 2 µm to 50 µm is equal to or less than 5.0 pieces/mm 2 . In the weld metal, distribution density of oxide inclusions having a diameter of 3 µm or more is 0.1 to 8.0 pieces/mm 2 .
Abstract:
A welding structure of a press-formed part according to the present invention is a welding structure of a press formed part made by combining and joining two parts formed by press-forming and each having an opening portion on at least one side of a cross-section, while the opening portions face each other. A step portion 7 is provided by forming a bent projection 5 projecting outwardly on a tip end portion of a side wall portion 3a of a lower side part 3, partially or entirely on a joining surface. A tip end side of the step portion 7 is fitted into the opening portion of an upper side part 9, and the step portion 7 of the lower side part 3 and the tip end of a side wall portion 9a of the upper side part 9 are linearly joined by arc welding.
Abstract:
The present invention has as its object to provide a spot welded joint and spot welding method which raise the fracture toughness of spot welded metal to raise the strength of the spot welded joint. In the present invention, there is provided a spot welding method comprising a melt zone forming step forming a melt zone by conduction and, after the melt zone forming step, a solidification step of running a current lower than the current run in the melt zone forming step so as to cause the melt zone to solidify, wherein, in the solidification step, electromagnetic vibration is applied to the melt zone, and a frequency f v of the electromagnetic vibration, a solidification speed ½ S when the melt zone solidifies, and an arm interval of dendrites when the melt zone solidifies satisfy 0.2‰¤ S /(» D ·f V )‰¤4.0.
Abstract:
An axle suspension system and a method of manufacture. The axle suspension system has an axle (20), an axle wrap (22), and a weld seam (54). The axle wrap has first (50) and second (52) wrap portions that mechanically interlock with each other and that have overlapping ends (68, 68') that receive the weld seam.
Abstract:
The present invention provides production methods for producing a fibre-reinforced metal component (1) having a metal matrix (2) which is penetrated by a plurality of reinforcing fibres (3). One production method comprises depositing in layers reinforcing fibres (3) in fibre layers, depositing in layers and liquefying a metal modelling material (4) in matrix material layers (5), and consolidating in layers the metal modelling material (4) in adjacently deposited matrix material layers (5) to form the metal matrix (2) of the fibre-reinforced metal component (1). Here, the metal component (1) is formed integrally from alternately deposited matrix material layers (5) and fibre layers (6). An alternative production method comprises introducing an open three-dimensional fibrewoven fabric consisting of reinforcing fibres (3) into a casting mould, pouring a liquid metal modelling material (4) into the casting mould and consolidating the metal modelling material (4) to form the metal matrix (2) of the fibre-reinforced metal component (1). Here, the metal component (1) is formed integrally from the consolidated metal modelling material (4) and the reinforcing fibres (3).
Abstract:
The invention relates to a method of assembling two sheet metal elements (1, 1'), involving applying a bead of adhesive to a first element, assembling the second sheet metal element on the first and securing it by spot welds to hold the two sheet metal elements stationary before curing the adhesive. The invention consists in the fact that the bead of adhesive is applied discontinuously to the first sheet metal element (1) along an adhesive line and then, once the second sheet metal element (1') has been pressed against the first, the two elements (1, 1') are held fixed together by creating spot welds on sections of the discontinuous adhesive line that are devoid of adhesive.