Horizontal fillet welding method, horizontal fillet welding system, and program

A horizontal fillet welding system comprising:

• an electrode that performs welding along a welding line by using a junction at which a standing plate and a bottom plate meet as the welding line and causing the electrode to perform a weaving operation with reference to the welding line as a center, wherein the weaving operation includes moving the electrode forward in a welding travel direction to a bottom-plate-side weaving edge and moving the electrode rearward against the welding travel direction to a standing-plate-side weaving edge when the electrode reaches the bottom-plate-side weaving edge, the weaving operation being repeated at the bottom plate side and the standing plate side, the weaving operating including tilting the electrode to make a torch tilt angle at which the electrode is tilted relative to the bottom plate larger at the bottom-plate-side weaving edge than at the standing-plate-side weaving edge,
• wherein an arc voltage at the standing-plate-side weaving edge is controlled in a range of 85% or more and less than 100% relative to an arc voltage at the welding line center position, and an arc voltage at the bottom-plate-side weaving edge is controlled in a range of more than 100% and 125% or less relative to the arc voltage value at the welding line center position, and
• when the electrode moves at the standing plate side and the bottom plate side, the arc voltage changes in synchronization with the weaving operation in a linear manner.

A non-transitory computer-readable medium storing a program used in a horizontal fillet welding system that performs welding along a welding line by using a junction at which a standing plate and a bottom plate meet as the welding line and causing an electrode to perform a weaving operation with reference to the welding line as a center, the program, when executed by a computer, causes the horizontal fillet welding system to perform the weaving operation including moving the electrode forward in a welding travel direction to a bottom-plate-side weaving edge and moving the electrode rearward against the welding travel direction to a standing-plate-side weaving edge when the electrode reaches the bottom-plate-side weaving edge, the weaving operation being repeated at the bottom plate side and the standing plate side, the weaving operating including tilting the electrode to make a torch tilt angle at which the electrode is tilted relative to the bottom plate larger at the bottom-plate-side weaving edge than at the standing-plate-side weaving edge,

• wherein an arc voltage at the standing-plate-side weaving edge is controlled in a range of 85% or more and less than 100% relative to an arc voltage at the welding line center position, and an arc voltage at the bottom-plate-side weaving edge is controlled in a range of more than 100% and 125% or less relative to the arc voltage value at the welding line center position, and
• when the electrode moves at the standing plate side and the bottom plate side, the arc voltage changes in synchronization with the weaving operation in a linear manner.