A brazing wire includes a brazing tube having an inner cavity and a flux filled in the inner cavity. A trench is provided on an outer peripheral surface of the brazing tube, and the trench extends along an axis of the brazing tube or spirally extends around the axis. A forming mold of the brazing wire includes a mold body having a molding cavity therein. An inner wall of the molding cavity is provided with a protrusion. When the brazing wire passes through the forming mold, the protrusion is used to form the trench. The forming method of the brazing wire includes the following steps. The brazing tube passes through the forming mold, and the trench is formed on the outer peripheral surface of the brazing tube by the protrusion. The trench extends along the axis of the brazing tube or spirally extends around the axis.

A threading die (100) for cold-drawing a metal wire (4) is described; the threading die comprises a hole (103) for the inlet of the wire to be drawn and the hole comprises a conical part (106) for drawing the metal wire and a truncated-cone shaped part (105) which precedes the conical part in the advance path of the metal wire and wherein no decrease in the diameter of the metal wire occurs; the base with the greater diameter (111) of the truncated-cone shaped part precedes the base with the shorter diameter (112) in the advance path of the metal wire.

In various embodiments, superconducting wires feature assemblies of clad composite filaments and/or stabilized composite filaments embedded within a wire matrix. The wires may include one or more stabilizing elements for improved mechanical properties.

In various embodiments, superconducting wires feature assemblies of clad composite filaments and/or stabilized composite filaments embedded within a wire matrix. The wires may include one or more stabilizing elements for improved mechanical properties.

An apparatus for manufacturing a multi-layer pipe is provided. The apparatus includes a ram extruding a matrix pipe, which is formed by inserting one or more insert pipes having different diameters into a receiving pipe, with a constant compression force, a heat-treatment unit heat-treating the matrix pipe extruded from the ram, and a drawing unit drawing, with a constant drawing force, the matrix pipe passing through the heat-treatment unit into a multi-layer pipe having a predefined diameter.

Provided is a wear resistant, sintered body made of a binderless carbide, cermet or cemented carbide, e.g., WC, W2C and/or eta-phase, with a grain size less than 6.0 μm, and less than 6% binder phase (e.g., Co—Ni—Fe). At least some working surfaces of the sintered body are surface treated with a boron yielding method including applying a low viscosity liquid medium having boron or aluminum content and heating at 1200° C. to 1450° C. under a pressure less than atmospheric pressure or a hydrogen containing atmosphere to from a hardness gradient with an increased hardness of the treated working surfaces of at least 50 to 200 HV5 and favorable compressive stresses in a surface zone that gives a tougher working surfaces of the boronized sintered bodies.

A threading die (100) for cold-drawing a metal wire (4) is described; the threading die comprises a hole (103) for the inlet of the wire to be drawn and the hole comprises a conical part (106) for drawing the metal wire and a truncated-cone shaped part (105) which precedes the conical part in the advance path of the metal wire and wherein no decrease in the diameter of the metal wire occurs; the base with the greater diameter (111) of the truncated-cone shaped part precedes the base with the shorter diameter (112) in the advance path of the metal wire.

A wire drawing die 1 includes a non-diamond material, is provided with a die hole 1h, and has a reduction 1c and a bearing 1d that is positioned downstream of the reduction 1c. A reduction angle γ which is an opening angle of the die hole 1h at the reduction 1c is less than or equal to 17°, and a surface roughness Ra of the die hole 1h within ±20 μm from a specific position inside the bearing 1d in a circumferential direction of the die hole 1h that is perpendicular to a wire drawing direction is less than or equal to 0.025 μm.

In various embodiments, superconducting wires feature assemblies of clad composite filaments and/or stabilized composite filaments embedded within a wire matrix. The wires may include one or more stabilizing elements for improved mechanical properties.

In various embodiments, superconducting wires feature assemblies of clad composite filaments and/or stabilized composite filaments embedded within a wire matrix. The wires may include one or more stabilizing elements for improved mechanical properties.