A method of monitoring a heating operation on a component by a flame torch, including the steps of producing a flame with the flame torch, rotating the component with respect to the flame so that a circular weld is created on the component, and providing a first sensor that is operatively engaged with the component so that the first sensor monitors rotation or non-rotation of the components.

A resistance spot welding device that joins predetermined parts to be welded includes: a storage configured to store a time variation of an instantaneous amount of heat generated per unit volume and a cumulative amount of heat generated per unit volume in test welding that precedes actual welding; and an adaptive controller and an electrode force controller configured to, in the case where the time variation of the instantaneous amount of heat generated per unit volume in the actual welding differs from a time variation curve stored as the target value, respectively control the current or a voltage during current passage and the electrode force to the parts to be welded to compensate for the difference within a remaining welding time so that the cumulative amount of heat generated per unit volume in the actual welding matches the cumulative amount of heat generated per unit volume stored in the storage.

A series of time-sequenced heat energy data arrays or data stream sets of a weld process region are processed by a weld data array or data stream processing system to produce a heat energy data set output that is related to weld process region features or weld process region heat energy data. The heat energy data set output can be displayed to a system user and modified by system user input to the weld data array or data stream processing system; alternatively, or in combination, the system user output and input, the heat energy data set output, or data produced from the heat energy data set output by the weld data array or data stream processing system, can be transmitted to a weld process controller to adjust parameters in the weld process responsive to the output of the weld data array or data stream processing system.

A controller and a control method for a hot air blower used in the field of solder reworking. The controller allows a user to change the control parameters effectively while using the hot air blower.

A method of monitoring a manufacturing status of an electric resistance welded pipe manufactured by shaping a steel strip into a pipe and butt welding both end parts of the steel strip in a width direction along a lengthwise direction includes: arranging an imaging unit in a gas shield nozzle having an opening opposing a region in which both of the end parts of the steel strip in the width direction are butt welded and shielding the region with inert gas by ejecting the inert gas onto the region through the opening, the imaging unit having a visual filed including the region; and determining quality of a butt-welded part based on an image shot by the imaging unit.

A resistance spot welding system includes a calculation unit that calculate and store a time variation of an instantaneous amount of heat generated, a division unit that divides a current pattern into a plurality of steps and stores a time variation of the instantaneous amount of heat generated and a cumulative amount of heat generated for each step as a target value, and an adaptive control unit that starts welding upon subsequent actual welding using, as a standard, a time variation curve of the instantaneous amount of heat generated that is stored as the target value, and adjusts welding current and voltage during welding, when a time variation amount of an instantaneous amount of heat generated deviates during any step from the time variation curve by a difference, so as to compensate for the difference during a remaining welding time in the step.

An all-in-one jigless projection loading system for a vehicle is adapted to load and assemble a body component to a vehicle body. The all-in-one jigless projection loading system may include: a fixing bracket fixed to an arm of a robot; a position adjusting member rotatably mounted to the fixing bracket; a gripper mounted to the fixing bracket to be movable backward and forward, and gripping the body component; an array unit mounted to the position adjusting member, and arraying the body component; and a welding unit mounted to the fixing bracket, and projection-welding the body component to a vehicle body.

After selecting a robot for carrying out a welding operation at a given welding spot, the cross-section of a welding gun with which that robot is provided and the cross-section of a workpiece at the welding spot are compared. Furthermore, a determination is made as to whether or not welding is possible without the welding gun and the workpiece coming into contact. When it is determined to be impossible, a substitute robot for carrying out the welding of the welding spot is selected. With the present invention, the automatic selection of the robot for carrying out the welding operation for the welding spot becomes possible. Therefore, the number of steps for robot selection can be reduced.

Provided is a welding gun control device whereby it is possible to reduce a load placed on a workpiece during workpiece detection in spot welding. This welding gun control device for controlling a welding gun for pressing an object to be welded between a movable electrode driven by a servomotor and a counter electrode facing the movable electrode and performing welding comprises: an operation control unit for causing the movable electrode to move at a first speed in a state in which the object to be welded is disposed between the movable electrode and the counter electrode, and causing the counter electrode or the object to be welded to move at a second speed slower than the first speed; and a workpiece detection unit for detecting the object to be welded on the basis of the operating state of the servomotor for driving the movable electrode, while the movable electrode and the counter electrode are caused to move by the operation control unit.

A welding quality control apparatus includes: a storage unit to store welding data files relating to a position of a movable electrode and a value of a current flowing between electrodes during a welding period, which are commonly acquired by welding robots and received from welding robot bodies or controllers thereof, together with a part number for individually identifying a part to be welded, a welding number for individually identifying a welding point of the part to be welded, a program ID for identifying a program used in welding the part to be welded, and date and time information; and a search unit to search the stored welding data files in accordance with a search condition relating to at least one of the part number, the welding number, the program ID, and the date and time information, and extract specific welding data files that match the search condition.