A method of forming a unitary metal piece includes providing first and second generally planar metallic portions. Each portion has generally parallel first and second sides opposite each other. Each portion has an end edge extending between the first and second sides. The first and second ends are proximate one another. The end edges are resistance welded together to form a weld joint and produce weld flash on at least one of the first and second sides of the portions. The weld flash on at least one of the first and second sides is ground, and a fluid is applied to the weld joint during the grinding of the weld flash.

A method of forming a unitary metal piece includes providing first and second generally planar metallic portions. Each portion has generally parallel first and second sides opposite each other. Each portion has an end edge extending between the first and second sides. The first and second ends are proximate one another. The end edges are resistance welded together to form a weld joint and produce weld flash on at least one of the first and second sides of the portions. The weld flash on at least one of the first and second sides is ground, and a fluid is applied to the weld joint during the grinding of the weld flash.

A method for manufacturing a joined member and a joined member manufacturing apparatus which can manufacture a joined member with a joint portion having an appropriate hardness. A method for manufacturing a joined member C by joining a first member D formed of a metal material having a possibility of undergoing quenching and a second member E formed of a metal material, the method includes a contact-placing step S1 of placing the first and second members D and E with joint target portions of the first and second members D and E respectively being in contact with each other; a joining step S2 of joining the first and second members D and E by passing a pulsed welding electric current A1 for joining through the joint target portions J of the first and second members D and E; a first tempering step S3 of tempering a joint portion F, where the first and second members D and E are joined, by passing a first tempering electric current A2 through the joint portion F; and a second tempering step S4 of tempering the joint portion F by passing a second tempering electric current A3 smaller than the first tempering electric current A2 through the joint portion F.

A steel pipe, consisting of, in terms of mass %: from 0.06% to 0.25% of C, 0.50% or less of Si, 1.00% to 1.80% of Mn, 0.030% or less of P, 0.020% or less of S, 0.08% or less of Al, 0.008% or less of N, 0.080% or less of Nb, and a remainder consisting of Fe and unavoidable impurities, wherein a compressive residual stress at an outer surface measured by an X-ray method is 250 MPa or more, and a compressive residual stress at a position at a depth of 1 mm from the outer surface measured by the X-ray method is 70% or more of the compressive residual stress at the outer surface measured by the X-ray method.

Application of the machine for flash-butt welding of rails with one rod, which connects two tong-type clamping devices is widening greatly the functional capabilities at its service, both in welding of separate rails and also in repair of rail tracks under the field conditions and in hard-to-reach places such as railway switches and frogs, the underground tracks, rails, which are laid side by side at a close distance, etc., not changing the optimum process and quality of the welded joints.

A system of forming a bimetal medical device from dissimilar metal components includes a first metal component, a second metal component, a retaining device, a compression mechanism, and an energy source. A method of forming the bimetal medical device with the system includes applying a first pulse of laser energy to a joint formed between the first and second metal components retained by the retaining device and compressing the first and second metal components together with the compression mechanism to form a welded region.

A system of forming a bimetal medical device from dissimilar metal components includes a first metal component, a second metal component, a retaining device, a compression mechanism, and an energy source. A method of forming the bimetal medical device with the system includes applying a first pulse of laser energy to a joint formed between the first and second metal components retained by the retaining device and compressing the first and second metal components together with the compression mechanism to form a welded region.

A planar heat pipe includes a container having a hollow portion provided at a central portion thereof with two opposing plate-shaped bodies, and a working fluid enclosed in the hollow portion. The hollow portion is provided with a wick structure. At least one of the plate-shaped bodies is a composite member of two or more types of metal members that are laminated and integrated. A metal member of the composite member forming a layer that contacts the hollow portion has a thermal conductivity of greater than or equal to 200 W/m.Math.K and a metal member of the composite member forming a layer that contacts an exterior has a thermal conductivity of less than or equal to 100 W/m.Math.K, a peripheral portion of the hollow portion being sealed.

A planar heat pipe includes a container having a hollow portion provided at a central portion thereof with two opposing plate-shaped bodies, and a working fluid enclosed in the hollow portion. The hollow portion is provided with a wick structure. At least one of the plate-shaped bodies is a composite member of two or more types of metal members that are laminated and integrated. A metal member of the composite member forming a layer that contacts the hollow portion has a thermal conductivity of greater than or equal to 200 W/m.Math.K and a metal member of the composite member forming a layer that contacts an exterior has a thermal conductivity of less than or equal to 100 W/m.Math.K, a peripheral portion of the hollow portion being sealed.

The present disclosure relates to an automatic forming machine for plant growth supports, comprising a ring rolling system with a ring rolling unit, a mold system with a mold unit, and a welding system, which are all disposed on a machine frame, wherein the ring rolling unit can roll a metal wire and make the metal wire be formed into a ring with an opening in the mold unit; the mold system is for carrying the ring and making two free ends of the ring with an opening aligned or alternately overlap with each other; the welding system welds can weld the opening of the ring carried by the mold unit, causing the ring to become a closed ring. The present disclosure has a high automatic degree and can reduce the production time and labor cost.