Abstract: A control method for gas-shielded arc welding includes providing a normal arc period in which the welding current is maintained at a setting current Icc set in advance, and providing a separation control period after the separation timing of the molten droplet is detected in the normal arc period, the separation control period including a current decreasing section, a current maintaining section, and a current increasing section. In the separation control period, at least one of the following controls for preventing a short circuit is performed: control of an output voltage, control of a feeding speed, and control of a gas ratio.

Abstract: Gas-shielded arc welding in which the tip-to-work distance changes is configured so that fluctuations in welding current are curbed while arc length control is maintained. This is achieved with a corrected current calculating unit that includes a first controlling expression where a first gain G1 is multiplied by an instantaneous voltage error value that is the difference between an instantaneous output voltage setting value and an output voltage detection value, and/or a second controlling expression where a second gain G2 is multiplied by an average voltage error value that is the difference between an output voltage setting value and an average output voltage detection value of a pre-set period of time, determines an arc property gain G1 and/or G2 based on a torch position detection value determined by a torch position determinator, and calculates a corrected current based on the first and/or the second controlling expression.

Abstract: A pulse arc welding profile control method, a control device, a welding system, a welding program, and a welding power supply are provided in which, even when a pulse arc welding method is used, protruding change information is extractable at high accuracy without influence from a welding current or an arc voltage having a pulse shape. An electric change amount detected at the time of weaving includes, as a parameter, at least one among a welding current detection signal and an arc voltage detection signal, takes a predetermined period as one period, calculates an average value of the electric change amount in each one period, and extracts, on the basis of the average value, the protruding change information in a groove to follow a welding line.

Abstract: A welding power source is configured to supply a welding current to a wire as a consumable electrode. The welding power source includes a controller configured to change the welding current based on a position of a distal end of the wire a distance from which to a surface of a base metal varies periodically, in a case where the distal end of the wire is fed toward the base metal with periodical switching between a forward feeding period and a reverse feeding period.

Abstract: A control method for gas-shielded arc welding includes providing a normal arc period in which the welding current is maintained at a setting current Icc set in advance, and providing a separation control period after the separation timing of the molten droplet is detected in the normal arc period, the separation control period including a current decreasing section, a current maintaining section, and a current increasing section. In the separation control period, at least one of the following controls for preventing a short circuit is performed: control of an output voltage, control of a feeding speed, and control of a gas ratio.

Abstract: In consumable electrode type gas shielded arc welding, a time second order differential value of a welding voltage or an arc resistance is calculated. Based on the second order differential value, a detachment of a droplet or a timing just before the detachment is detected. After the droplet detachment or the timing just before the detachment is detected, a welding current value is immediately switched to a predetermined current value lower than that at the time of the detection. According to the control, even if welding conditions are changed or wire extension lengths are changed in the welding, the droplet detachment can be correctly detected.