At a plurality of welding positions in an overlap portion of a plurality of members including a high-tensile steel sheet whose carbon content is 0.07 weight % or more, first beads (31 to 36) in a closed loop shape or a closed loop-like shape and second beads (41 to 46) in a closed loop shape or a closed loop-like shape on inner sides of the first bead (31 to 36) are formed by remote laser welding for joining. At this time, there are a procedure for successively forming the plural first beads (31 to 36) and a procedure for successively forming the plural second beads (41 to 46) for the plural formed first beads (31 to 36), and in both of the cases, the beads are each formed at a position except the closest welding position among the plural welding positions. Consequently, it is possible to enhance strength of a weld zone and to suppress welding deformation.

A method of additive manufacturing, including: placing a layer (10) of strip-cast superalloy sheet material over a subcomponent (12) leaving a gap (20) between the layer and the subcomponent; and creating a weldment (14) to the layer. Shrinkage in the layer caused by the weldment is accommodated by a decrease in the gap with reduced shrinkage stress in the weldment. The layer may be formed of more than one piece (16), and the weldment may join the pieces together with or without joining the layer to the subcomponent. The gap may again grow due to differential thermal expansion when the resulting component is placed into service, thereby functioning as a passively regulated cooling channel.

A laser system for laser metal deposition includes a laser source for generating a laser beam having a wavelength in a range between 0.4 m and 1.5 m, and a jet nozzle for directing the laser beam at a workpiece surface and for directing a powder jet including a pulverulent material at the laser beam and at the workpiece surface. The laser beam exiting from the jet nozzle has a reduced intensity in a core region in comparison with a border region. The pulverulent material includes hard-material particles.

An object is to provide a structure and a method of joining a nozzle vane and a lever, and a variable geometry turbocharger, capable of reducing breakage of a welded part between a shaft portion of the nozzle vane and the lever during usage of the same by reducing generation of a hot crack in weld metal at the welded part. A joint structure includes: a nozzle vane 2 disposed in an exhaust passage for guiding exhaust gas to a turbine wheel 34 of a variable geometry turbocharger 500, and including a shaft portion 2a; and a lever 1 including a fitting surface 42a fitted with a peripheral surface 72 on one end side of the shaft portion, for transmitting torque to the shaft portion to adjust a vane angle of the nozzle vane. Weld metal 50 at a welded part 40 between the lever and the nozzle vane is formed so that a center position 64 of the weld metal is disposed inside a position 17 of the fitting surface with respect to a radial direction of the shaft portion.

A system and method is provided related to additive manufacturing, where a welding system is used to build a work piece on a substrate where the work piece has discrete attachment points to the substrate to allow residual stresses in the finished work piece to aid in the removal of the work piece from the substrate. The work piece has one or more discrete attachment points which penetrate into the substrate to secure the work piece during manufacture, but which allow the residual stress in the completed work piece to aid in the removal of the work piece from the substrate.

A weld bead shaping apparatus including: a gouging torch for gouging an object to be shaped; a shape sensor for measuring a shape of the object; a slider apparatus and an articulated robot for driving the gouging torch and shape sensor; an image processing apparatus; and a robot controlling apparatus. The image processing apparatus includes: a shape data extracting unit extracting shape data of the object, from a measurement result obtained by the shape sensor; and a weld reinforcement shape extracting/removal depth calculating unit calculating a weld reinforcement shape of the weld bead from a difference between the shape data and a preset designated shape of the object, and calculating a removal depth by which gouging is performed, based on the weld reinforcement shape. The robot controlling apparatus controls the slider apparatus, the articulated robot, and the gouging torch based on the weld reinforcement shape and the removal depth.

A displacement/stress computation unit computes residual stress and deformation by conducting a thermal-elastic-plastic analysis using idealized explicit FEM. A temperature increment is set in magnitude to have a value larger in magnitude than a temperature increment used in a thermal-elastic-plastic analysis using static implicit FEM. Heating is performed for each plurality of blocks according to a heating pattern in which blocks that are not adjacent to one another are simultaneously heated. Each block is heated with a surface heat source having a heat input quantity adjusted with respect to a heat input quantity applied when a moving heat source is used to heat the block.

For the production of fibre waveguides mounted in a metal hollow profile, a flat metal strip is supplied to a deforming unit. The deforming unit is configured for continuously deforming the supplied flat metal strip into a shape corresponding to the hollow profile. The hollow profile is continuously welded along a longitudinal seam by means of a laser. A filler gel with a viscosity which increases with decreasing temperature, and one or more fibre waveguides, are introduced into the welded hollow profile in a continuous process via a guide or protective tube. In order to introduce the one or more fibre waveguides with an excess length into the hollow profile, the welded hollow profile is elastically stretched, is cooled, and is relaxed again. The finished product is received in a receiving unit. The continuous closed-loop control of the excess length of the fibre waveguides is performed inter alia through continuous open-loop control of the gel temperature, of the laser power and of the force exerted on the hollow profile for the elastic stretching.

The invention discloses an equivalent heat source modeling method for oscillating laser welding, comprising: constructing an energy distribution cloud chart of an actual laser welding heat source under different oscillating trajectories, oscillating frequencies and oscillating amplitudes; extracting an energy distribution curve along the center of the heat source, and acquiring spatial position information of multiple target points of interest; constructing an equivalent Gaussian heat source model for each of the target points of interest; and verifying matching degrees between each Gaussian heat source model and the actual laser welding heat source, and taking Gaussian heat source models passing the verification as equivalent heat source models of the actual laser welding heat source. The invention also provides a simulation method for oscillating laser welding, which constructs an equivalent heat source model through the equivalent heat source modeling method, and perform welding simulation based on the equivalent heat source model.

A method for welding a component made of steel, in which a built-up welding takes place, wherein the weld site is then allowed to cool and maintained at a holding temperature above a martensite-forming temperature for two to ten hours, or until a bainitic join has completely formed, and then it is reduced to an ambient temperature in a controlled manner, in particular, thereby concluding the heat treatment.