A spot welding apparatus includes a spot welding gun and a welding gun control apparatus. The welding gun control apparatus includes a pressurizing force control part controlling the pressurizing force, a position control part controlling the position of at least one electrode, and a determination part determining whether or not the welding is performed in a normal state. The position control part controls an electrode drive motor so as to hold the electrodes, after the supply of the electric current is started, at positions when the initial pressurizing force is applied before the electric current is supplied. The determination part acquires the pressurizing force and determines whether or not the welding is performed in a normal state based on change tendency in the pressurizing force.

A method for monitoring welding of an electric resistance welded steel pipe of the present invention includes: an image acquisition step in which, when an electric resistance welded steel pipe is welded, a V-convergence portion including an edge detection area and a V-convergence point, and a welding portion including a position where a molten steel starts to be discharged from an inside of a wall thickness and a bead, are imaged to obtain a captured image; a determination information acquisition step in which the captured image is image-processed, and a molten length from the V-convergence point to the position where the molten steel starts to be discharged or a molten width of the welding portion or a combination thereof is acquired as a determination information; and a determining step in which it is determined whether a cold welding has occurred by comparing the determination information with a determination threshold value set in advance for each wall thickness of the electric resistance welded steel pipe.

A method for monitoring welding of an electric resistance welded steel pipe of the present invention includes: an image acquisition step in which, when an electric resistance welded steel pipe is welded, a V-convergence portion including an edge detection area and a V-convergence point, and a welding portion including a position where a molten steel starts to be discharged from an inside of a wall thickness and a bead, are imaged to obtain a captured image; a determination information acquisition step in which the captured image is image-processed, and a molten length from the V-convergence point to the position where the molten steel starts to be discharged or a molten width of the welding portion or a combination thereof is acquired as a determination information; and a determining step in which it is determined whether a cold welding has occurred by comparing the determination information with a determination threshold value set in advance for each wall thickness of the electric resistance welded steel pipe.

Disclosed is a nut welding automation system configured to automatically weld different types of nuts to holes formed in a metal-processed product using a robot. The system may reduce an error rate with respect to products by preventing omission of a nut or welding of a wrong type nut so that reliability in administration of the welding process may be secured and overall productivity may be improved.

A resistance welding control system includes an electrode displacement detector, a temperature estimation information acquiring unit, and a temperature estimation unit. The electrode displacement detector detects a positional displacement between opposite electrodes while the electrodes are supplying electricity between the electrodes to perform resistance welding of welding members held between the electrodes. At least one of the electrodes is movable toward or apart from the other electrode. The temperature estimation information acquiring unit acquires at least an interelectrode voltage, a current density in the welding members, and a physical property value of the welding members as temperature estimation information to be used to estimate a temperature of a welding portion between the welding members. The temperature estimation unit estimates the temperature of the welding portion based on the temperature estimation information and the positional displacement while at least either one of the positional displacement and the interelectrode voltage is stabilized.

An inspection system is configured to inspect the condition of a braze joint formed within a structure, wherein the braze joint is formed from a braze filler material having a tracer material disposed therein. The inspection system includes an energy source for directing energy towards the structure, an energy detector for detecting information regarding the structure following interaction with the energy directed from the energy source, and a data analysis system for analyzing the information detected by the energy detector. The data analysis system is configured to distinguish the tracer material from the remaining materials forming the structure in order to determine a suitability of the braze joint.

A method for resistance welding includes performing a plurality of resistance welding processes during which welding electrodes are pressed against respective welding spots of respective workpieces. The welding electrodes are energized with a respective welding current for each of the plurality of resistance welding processes, and for each of the plurality of resistance welding processes, a respective at least one characteristic value that characterizes a quality of the welding is determined. A statistical analysis of the determined at least one characteristic value for each of the plurality of resistance welding processes is performed, and based upon the analysis, an adaptation of the prescribed welding parameters is determined.

An apparatus includes a housing, a pin, a mechanism and a sensor. The housing is configured to receive a weld head. The pin is configured to move linearly relative to said housing. The mechanism is configured to convert a position of said pin into a displacement. The sensor is configured to generate a value representative of said position of said pin based on said displacement.

In a method for connecting a spindle (12) to a spindle holding element (14) in order to produce a longitudinal adjustment device (1) for a vehicle seat (16), a spindle (12) extended along a longitudinal axis (L) is cohesively using an connected to a connecting portion (142) of a spindle holding element (14) by using a resistance welding method. In this way, there is provided a method for connecting a spindle to a spindle holding element in order to produce a longitudinal adjustment device for a vehicle seat, which provides for a firm connection of a spindle to a guide rail via one or more a spindle holding elements, by a producing process that is easy to manage and to monitor.

In a method for connecting a spindle (12) to a spindle holding element (14) in order to produce a longitudinal adjustment device (1) for a vehicle seat (16), a spindle (12) extended along a longitudinal axis (L) is cohesively using an connected to a connecting portion (142) of a spindle holding element (14) by using a resistance welding method. In this way, there is provided a method for connecting a spindle to a spindle holding element in order to produce a longitudinal adjustment device for a vehicle seat, which provides for a firm connection of a spindle to a guide rail via one or more a spindle holding elements, by a producing process that is easy to manage and to monitor.