Abstract: A consumable electrode type arc welding method for generating arc between a plate-shaped work and a welding wire by a mixed shield gas including argon gas to weld the plate-shaped work, includes: making a state of reverse polarity in which the polarity of the welding wire is positive at the welding start time, and switching at least once to a state of positive polarity in which the polarity of the welding wire is negative.

Abstract: A non-consumable electrode type arc welding apparatus includes a torch having an electrode portion and a nozzle, a gas supply that supplies, to the torch, a shielding gas flowing through a gap formed between the electrode portion and the nozzle, a first power source that applies a voltage between the electrode portion and the nozzle to generate a pilot arc, a second power source that applies a voltage between the electrode portion and a work to generate a main arc, and a controller that controls the first power source and the second power source. The electrode portion has an electrode and an electrode holding portion holding a base portion of the electrode, the electrode holding portion has a protrusion protruding toward the nozzle from the side facing the nozzle, and the protrusion and the nozzle are caused contact and separate from each other.

Abstract: The present invention provides a robot system in which a robot and a positioner are combined with each other. In the robot system, footprint is reduced and a production line having a short tact time between steps is formed. The robot system includes a work object, robots that perform a work operation on the work object, and positioners that position the work object, wherein the robots are provided on frame members of the positioners.

Abstract: A robot system includes s a robot (1) which moves a tool (3) attached to an end of the robot (1) by driving a robot drive shaft. The tool (3) applies a laser beam inputted from a laser oscillator (5) by drive of the tool drive shaft to an object. A robot control device (2) controls the robot drive shaft and the tool drive shaft in synchronization.

Abstract: The present invention provides a robot system in which a robot and a positioner are combined with each other. In the robot system, footprint is reduced and a production line having a short tact time between steps is formed. The robot system includes a work object, robots that perform a work operation on the work object, and positioners that position the work object, wherein the robots are provided on frame members of the positioners.

Abstract: A robot welding controller and a robot welding control. It comprises a robot having a welding torch at its tip, a robot controller, a wire feeder, and a welding electric power. It performs welding by moving the welding torch on the basis of a commanded welding line. A contact detecting section detects contact of the wire and the base material. A feed direction switching section switches feed directions of the wire. An arc generation detecting section detects that an arc is generated between the wire and the base material. A waveform control section controls electric power waveforms of plural shapes applied between the wire and the base material. A welding sequence section controls the operations of the contact detecting section, the feed direction switching section, the arc generation detecting section and the waveform control section in block.

Abstract: A consumable electrode type arc welding method for generating arc between a plate-shaped work and a welding wire by a mixed shield gas including argon gas to weld the plate-shaped work, includes: making a state of reverse polarity in which the polarity of the welding wire is positive at the welding start time, and switching at least once to a state of positive polarity in which the polarity of the welding wire is negative.

Abstract: There is provided a robot system which moves a laser beam in a processing path desired by a manipulator by moving a robot in an instructed path and controlling a driving shaft of a tool. In the robot system which includes a robot 1 having a plurality of driving shafts, a tool 3 having a plurality of driving shafts and fitted on an end portion of the robot 1, a robot control device controlling the driving shafts of the robot 1 and the tool 3, and a laser oscillator 5 connected to the tool 3, the robot 1 moves the tool 3 by means of the drive of the driving shafts of the robot, the tool 3 radiates a laser beam which is incident from the laser oscillator 5 to an object by means of the drive of the driving shafts of the tool, and a robot control device 2 controls the driving shafts of the robot 1 and the driving shafts of the tool 3 in synchronization with each other.

Abstract: The invention provides a robot welding controller and a robot welding control method for realizing welding of high quality by using a robot. The robot welding controller comprises a robot (1) having a welding torch (2) at its tip, a robot controller (5) for controlling the operation of the robot (1), a wire feeder (3) for feeding a wire to the welding torch (2), and a welding electric power source (10) for supplying electric power between the wire and a base material, and performs welding by moving the welding torch (2) on the basis of a commanded welding line.

Abstract: An arc welder comprising: a rectifier circuit 2 which rectifies an alternating current 1 to a direct current; an inverter circuit 3; a transformer 4; a second rectifier circuit 5 which rectifies an output of the transformer 4 to a direct current; and a first reactor 6 which is connected to the second rectifier circuit 5. The arc welder further has a current circuit 10 which is connected in parallel to the second rectifier circuit 5 with a reactance that is larger than the reactance of the first reactor 6.

Abstract: It is an object to provide an arc welding apparatus capable of causing an operator to easily decide a welding abnormality and the quality of a welding condition by simultaneously displaying a welding current command value, a welding voltage command value and a wire feeding speed command value and switching and displaying an actual welding current value, an actual welding voltage value and an actual wire feeding speed. There are provided a welding torch (8), a wire feeding device for feeding a wire (9) in contact with the internal surface of a chip (17) of the welding torch (8), a welding source (4) for supplying a power to the chip (17) and a base metal (13), a welding current detector (30) and a welding voltage detector (31), and a wire feeding speed command value, a welding current value and a welding voltage value are displayed independently and simultaneously.

Abstract: An arc welding cable that is resistant to bending and twisting and can give a long life is provided. For this purpose, an arc welding cable (65) for supplying a welding current, a welding wire and a sealed gas from a wire feeding device (61) to a welding torch (64), has a passage (4) for the welding wire (2) and sealed gas is located at a center of the arc welding cable and a plurality of conductors (5) are arranged apart from one another on a circumference around the passage (4). The space between the plurality of conductor (5) may be filled with a cushion material such as cotton or elastic synthetic resin.

Abstract: An arc welding cable that is resistant to bending and twisting and can give a long life is provided. For this purpose, an arc welding cable (65) for supplying a welding current, a welding wire and a sealed gas from a wire feeding device (61) to a welding torch (64), has a passage (4) for the welding wire (2) and sealed gas is located at a center of the arc welding cable and a plurality of conductors (5) are arranged apart from one another on a circumference around the passage (4). The space between the plurality of conductor (5) may be filled with a cushion material such as cotton or elastic synthetic resin.

Abstract: It is an object to provide an arc welding apparatus capable of causing an operator to easily decide a welding abnormality and the quality of a welding condition by simultaneously displaying a welding current command value, a welding voltage command value and a wire feeding speed command value and switching and displaying an actual welding current value, an actual welding voltage value and an actual wire feeding speed. There are provided a welding torch (8), a wire feeding device for feeding a wire (9) in contact with the internal surface of a chip (17) of the welding torch (8), a welding source (4) for supplying a power to the chip (17) and a base metal (13), a welding current detector (30) and a welding voltage detector (31), and a wire feeding speed command value, a welding current value and a welding voltage value are displayed independently and simultaneously.

Abstract: An arc welder comprising: a rectifier circuit 2 which rectifies an alternating current 1 to a direct current; an inverter circuit 3; a transformer 4; a second rectifier circuit which rectifies an output of the transformer 4 to a direct current; and a first reactor 6 which is connected to the second rectifier circuit 5. The arc welder further has a current circuit 10 which is connected in parallel to the second rectifier circuit 5 with a reactance that is larger than the reactance of the first reactor 6.

Abstract: An EP output voltage to be outputted during a period of EP polarity is set so that a welding current becomes equal to or lower than a critical current level, and an EN output voltage to be outputted during a period of EN polarity is set at a level lower than the EP output voltage. This makes it possible to substantially equalize a wire melting rate in the period of EN polarity and that in the period of EP polarity with each other. Even at such a short arc length as causing frequent short circuiting, gas-shielded AC arc welding making use of a consumable wire can be still performed stably so that high wire melting rate, shallow penetration, convex weld reinforcement and the like, which are characteristic features of AC welding, can each be set selectively at a desired level or in a desired shape depending on the application.

Abstract: In the preparatory stage, among all possible lines in two rectangular windows (12) and (14), assuming dust, a flaw or the like to be a part of a line, the most valid one is recognized as a line, and the inclination and characteristic values of the line are obtained, and then each rectangular window is deformed into a parallelogram-shaped window along this inclination. In the detecting stage, the inclination and characteristic values of the line to be detected are obtained by use of the parallelogram-shaped windows. Thus, even if image data is inferior, the detection of a line is possible, so that it is possible to detect a weld line, an edge of an object of detection, etc. with high accuracy.

Abstract: In the case where lap fillet welding is carried out by a conventional arc welding robot, when a weld wire is once departed towards an upper plate, the wire keeps being away from a weld line, and therefore, various teaching techniques so as to prevent such a departure have been re-required. In the case where a weld line is long, if the wire is departed, a defective weld length becomes long, thus posing an significant problem.The present invention provides a control method for an arc sensor by detection of a weld current. That is, a departure of a lap fillet weld towards an upper plate is prevented merely by addition of a detection algorithm, teaching can be simplified and practical merits are great.

Abstract: A method of detecting information on an arc welding position by monitoring the shape and/or position of an welding arc. When in the arc welding along a welding groove position while locating the same, the shape of the arc is picked up from above the joint portion of a member to be welded by means of an image pickup device, and the arc shape picked up is binary-coded. This binary arc shape and/or position are monitored to detect the welding groove position, the height of the welding torch, the welding start point, the welding end point, the external corner point, the internal corner point, the contact point of the welding wire with the work, and the welding groove gap.

Abstract: A method of detecting information on an arc welding position by monitoring the shape and/or position of an welding arc. When in the arc welding along a welding groove position while locating the same, the shape of the arc is picked up from above the joint portion of a member to be welded by means of an image pickup device, and the arc shape picked up is binary-coded. This binary arc shape and/or position are monitored to detect the welding groove position, the height of the welding torch, the welding start point, the welding end point, the external corner point, the internal corner point, the contact point of the welding wire with the work, and the welding groove gap.