Abstract: An example welding apparatus includes a welding power source configured to output current between a consumable electrode and a workpiece; a feeding apparatus configured to move the consumable electrode toward the workpiece; and circuitry. The circuitry is configured to: control the welding power source to repeat a sequence including: outputting a positive peak current from the workpiece to the consumable electrode during a positive peak period; outputting a first base current between the consumable electrode and the workpiece during a first base period following the positive peak period, an absolute value of the first base current being less than the positive peak current; and outputting a negative peak current from the consumable electrode to the workpiece during a negative peak period following the first base period, an absolute value of the negative peak current being greater than the absolute value of the first base current.

Abstract: A welding system includes a welder configured to weld a workpiece at welding points on the workpiece, data acquisition circuitry configured to acquire welding data indicating welding quality at the welding points, and quality evaluation circuitry configured to evaluate the welding quality at each of the welding points based on the welding data according to a determination algorithm which is associated with each of the welding points.

Abstract: A welding apparatus includes a welding power source configured to output current between a consumable electrode and a workpiece; and circuitry. The circuitry is configured to control the welding power source to repeat a sequence including: outputting a positive peak current from the workpiece to the consumable electrode during a positive peak period; outputting a positive base current from the workpiece to the consumable electrode and subsequently outputting a negative base current from the consumable electrode to the workpiece during a first base period, an absolute value of the positive base current and the negative base current being less than the positive peak current; and outputting a negative peak current from the consumable electrode to the workpiece during a negative peak period following the first base period, an absolute value of the negative peak current being greater than the absolute value of the positive base current and the negative base current.

Abstract: An example welding apparatus includes a welding power source configured to output current between a consumable electrode and a workpiece; a feeding apparatus configured to move the consumable electrode toward the workpiece; and circuitry. The circuitry is configured to: control the welding power source to repeat a sequence including: outputting a positive peak current from the workpiece to the consumable electrode during a positive peak period; outputting a first base current between the consumable electrode and the workpiece during a first base period following the positive peak period, an absolute value of the first base current being less than the positive peak current; and outputting a negative peak current from the consumable electrode to the workpiece during a negative peak period following the first base period, an absolute value of the negative peak current being greater than the absolute value of the first base current.