Abstract:
PROBLEM TO BE SOLVED: To allow a nugget to fully grow on contact surfaces of workpieces when executing spot welding on a laminate formed by laminating three or more workpieces.SOLUTION: For example, when executing the spot welding to a laminate 16a in which metal plates 18, 20 of high resistance and a metal plate 22 of low resistance are layered from the lower end in this order, the laminate 16a is held by a first welding tip 10 of the positive polarity and a second welding tip 12 of the negative polarity. At the same time, an auxiliary electrode 14 of the negative polarity is abutted on the metal plate 20 facing the inside of the laminate 16a out of the metal plates 18, 20 of the large contact resistance in a vicinity of the contact surface. In the initial welding stage, the pressure applied to the laminate 16a by the first welding tip 10 and the second welding tip 12 is relatively low, and then, the pressure is increased, continuing the conduction.
Abstract:
PROBLEM TO BE SOLVED: To improve bonding strength, in particular, peel strength, when bonding dissimilar metal materials.SOLUTION: A steel member 11 (high-melting-point material) and an aluminum member 12 (low-melting-point material) as the dissimilar metal materials which have different melting points are located in a planned bonding position, and a rotation tool 13 is pressed against and inserted to the steel member 11 while being rotated. An insertion position of the rotation tool 13 is controlled to a position where the steel member 11 is not broken through. The steel member 11, by friction heat between the rotation tool 13, and the aluminum member 12, by heat transfer of the friction heat, are partially softened, and thus, plastically fluidized. The steel member 11 and the aluminum member 12 are partially stirred by the rotation tool 13 thereby carrying out friction-stir welding of the steel member and the aluminum member.
Abstract:
A metal forming process and welded coil assembly that may be used to form complex metal components in a manner that is efficient, reduces scrap material, and maintains the structural integrity of the components. Generally, a number of individual metal blanks are welded to one or more sheet metal coils in order to produce a welded coil assembly. The metal blanks may be welded along the length of the inner sides of two sheet metal coils, or the metal blanks may be welded along the length of the outer sides of a single sheet metal coil, to cite a couple of possibilities. The welded coil assembly can then be fed through a progressive stamping apparatus or other machine to create a complex metal part.
Abstract:
PROBLEM TO BE SOLVED: To provide a press forming method by which the formability of a tailored blank different in thickness and material is improved to avoid the breakage on the low strength (or smaller thickness) blank side attributable to the strength rate control in press forming the tailored blank different in thickness and material. SOLUTION: In the press forming method of the tailored blank different in material in which a stock plate different in strength (=(tensile strength)×(thickness)) is continuously welded and tightened, and the strength ratio is preferably >=1.2, a weld zone is set to a part to generate the distortion gradient in press forming a single stock plate, a stock plate of higher strength is arranged on the side higher in distortion, a stock plate of lower strength is arranged on the side lower in distortion, and both stock plates are continuously welded and tightened, and then, press formed. A weld zone is set in the vicinity of a part to generate the distortion peak when the single stock plate is press formed, the stock plate of higher strength is arranged on the side including the distortion peak, and the stock plate of lower strength is arranged on the side including no distortion peak, and both stock plates are continuously welded and tightened, and then, press formed.
Abstract:
PROBLEM TO BE SOLVED: To provide a joining structure of a metal workpiece and a joining method thereof having less limitation in a joining location. SOLUTION: Joining surfaces 1a and 2a rising to the direction to workpieces 1 and 2 as mating members are formed on at least one of a pair of the metal workpieces 1 and 2 joined with each other. An adhesive agent 4 of a chain-reacting type is disposed in a gap 3 between the workpieces 1 and 2 formed by rising in joining. The adhesive agent 4 of the chain-reacting type is successively cured by autogenously generating internal energy by energy imparted from the outside. A portion where the workpieces 1 and 2 face with each other directly (welding portion 5) is welded by a laser beam 31, and the energy for curing is imparted to the adhesive agent 4 by the laser beam 31. COPYRIGHT: (C)2009,JPO&INPIT