Welding system, feed control method, and communication connection method

A feed control method in which a tip of a welding wire is fed toward a base metal while periodically repeating a forward feed period and a reverse feed period as one cycle, and the welding wire is welded while controlling at least one of welding conditions based on at least one of a tip position or a feed speed of the welding wire, wherein

• in a welding system including at least a welding control device, a welding power supply, a servo motor, and a servo amplifier that controls the servo motor, at least the servo amplifier and the welding power supply are directly or indirectly connected to each other via a digital communication,
• the servo amplifier is configured to
• generate a feed command for forward feeding or reverse feeding based on setting information input via the digital communication,
• output a control signal based on the generated feed command to the servo motor, and
• output a synchronization signal related to the generated feed command to the welding power supply, and
• the welding power supply is configured to calculate a wire position phase based on the synchronization signal.

A communication connection method for communicating between devices constituting a welding system that controls at least one of welding conditions based on at least one of a tip position or a feed speed of a welding wire such that a tip of the welding wire is fed toward a base metal while periodically repeating a forward feed period and a reverse feed period as one cycle, wherein

• the welding system includes at least a welding control device, a welding power supply, a servo motor, and a servo amplifier configured to control the servo motor,
• at least the servo amplifier and the welding power supply are directly or indirectly connected to each other via a digital communication,
• the servo amplifier is configured to
• generate a feed command for forward feeding or reverse feeding based on setting information input via the digital communication from a device other than the servo amplifier among the devices constituting the welding system,
• output a control signal based on the generated feed command to the servo motor, and
• output a synchronization signal related to the generated feed command to the welding power supply, and
• the welding power supply is configured to calculate a wire position phase based on the synchronization signal.