Abstract:
A resistance welding method according to the invention includes: a melting start time specification process for specifying a melting start time, which is a time at which at least a part of a welding portion (Y) of a welding subject (W) starts to melt while being subjected to Joule heating by a power input from an electrode (11) pressed against the welding subject (W), by detecting a variation in an ultrasonic wave emitted toward the welding portion; a first power amount calculation process for calculating a first power amount, which is an integrated value of the power input into the welding subject via the electrode from the melting start time; a first determination process for determining whether or not the first power amount has reached a first set value; and a heating process for performing the Joule heating from the melting start time until the first power amount reaches the first set value.
Abstract:
In a resistance welding method, by controlling the power amount from a melting start time onward, the weld quality may be stabilized efficiently, even when a disturbance is present, because of the correlation between the amount of power input from the melting atart time and a resulting nugget. The resistance welding method includes: pressing an electrode against a workpiece; inputting power to the workpiece through the electrode to subject the workpiece to Joule heating; detecting the melting start time, which is the time at which at least a portion of the faying portion of a workpiece starts to melt when subjected to Joule heating; calculating a first power amount input into the workpiece from the melting start time; and determining whether the first power amount has reached a first set value; and continuing the Joule heating until the first power amount reaches the first set value.
Abstract:
An aluminum conductor having very high specific resistance and withstand breakdown voltage is provided. An aluminum conductor of the present invention includes a substrate made of pure aluminum or aluminum alloy and an insulating layer with which an outer surface of this substrate is covered, in which the insulating layer is composed of an anodized layer formed on the substrate and having a specific surface area of 25 m 2 /g or more. At the specific surface area of 25 m 2 /g or more, the specific resistance and the withstand breakdown voltage of the anodized layer rapidly rise exactly beyond comparison. The aluminum conductor covered with such an anodized layer exhibits high insulation properties. Moreover, the anodized layer has excellent heat resistance. Therefore, the aluminum conductor of the present invention exhibits excellent insulation properties even in a high temperature environment etc.
Abstract:
A method for manufacturing an element wire assembly includes: a first step of bunching up and rolling or drawing a plurality of circular cross-section conducting wires (1) to shape each of the conducting wires into a polygon in cross section and form the conducting wires (1') and form a conducting wire assembly (10); and a second step of heat-treating the conducting wire assembly (10) to form an oxide film (2) on the periphery of each of the conducting wires (Γ) to form element wires (3) and form an element wire assembly (20).
Abstract:
A method for manufacturing an element wire assembly includes: a first step of bunching up and rolling or drawing a plurality of circular cross-section conducting wires (1) to shape each of the conducting wires into a polygon in cross section and form the conducting wires (1') and form a conducting wire assembly (10); and a second step of heat-treating the conducting wire assembly (10) to form an oxide film (2) on the periphery of each of the conducting wires (Γ) to form element wires (3) and form an element wire assembly (20).
Abstract:
A metal nanoparticle paste includes: metal nanoparticles; a phosphate dispersant that has a hydrophilic portion; and a polar solvent, wherein the content of the metal nanoparticles is higher than or equal to 70 percent by weight and lower than 100 percent by weight.
Abstract:
In a resistance welding method, by controlling the power amount from a melting start time onward, the weld quality may be stabilized efficiently, even when a disturbance is present, because of the correlation between the amount of power input from the melting atart time and a resulting nugget. The resistance welding method includes: pressing an electrode (11a, 11b) against a workpiece (Wa, Wb); inputting power to the workpiece (Wa, Wb) through the electrode (11a, 11b) to subject the workpiece (Wa, Wb) to Joule heating; detecting the melting start time, which is the time at which at least a portion of the faying portion of a workpiece (Wa, Wb) starts to melt when subjected to Joule heating; calculating a first power amount input into the workpiece (Wa, Wb) from the melting start time; and determining whether the first power amount has reached a first set value; and continuing the Joule heating until the first power amount reaches the first set value.
Abstract:
This invention aims to provide a resistance welding method capable of stabilizing quality or improving efficiency of resistance welding such as spot welding. This resistance welding method comprises a calculating step of calculating resistance ratio X of a second electric resistance value R2 of workpieces to be joined in residual heat after Joule heating stops to a first electric resistance value R1 of the workpieces immediately before the Joule heating stops or vice versa (R2/R1 or R1/R2); a determining step of determining whether the resistance ratio X is equal to or greater than a threshold value Xn, and a reheating step of carrying out the Joule heating again when the resistance ratio X is smaller than the threshold value Xn. Thereby at least part of a welding portion is melted and solidified to reliably form a nugget, and a stably resistance-welded member can be provided.