Abstract: A method of controlling arc welding with a consumable electrode includes repeating the following periods in sequence: a short-circuit welding period to perform short-circuit arc welding; a pulse welding period to perform pulse welding; and a cooling period in which the welding current output is zero.

Abstract: In arc welding in which a welding wire serving as a consumable electrode is fed toward a base material and a welding current is caused to flow through the welding wire and the base material to alternately repeat a reverse polarity period and a positive polarity period, after a short circuit between the welding wire and the base material is detected, a feeding speed of the welding wire is changed from a first feeding speed to a second feeding speed on a negative side of the first feeding speed when a speed in a direction toward the base material is defined as positive.

Abstract: Arc welding, in which a welding wire serving as a consumable electrode is fed toward a base material and a welding current alternately including a peak current and a base current is caused to flow through the welding wire and the base material, is performed such that after a short-circuit between the welding wire and the base material is detected, a feeding speed of the welding wire is changed from a first feeding speed to a second feeding speed that is on a negative side from the first feeding speed when a speed in a direction in which the welding wire is fed toward the base material is defined as positive.

Abstract: Provided is an arc welding device that performs welding by alternately repeating a short-circuit period provided with a short-circuit state in which a welding wire and a base material are short-circuited, and an arc period provided with an arc state in which an arc is generated between the welding wire and the base material. A calculation unit calculates an integrated power value by integrating power supplied to the welding wire within a predetermined period, after the welding wire is short-circuited. A controller reduces a welding current to be supplied to welding wire when the integrated power value is larger than a predetermined threshold.

Abstract: A pulse welding period alternately includes a first peak period in which a first peak current whose peak value is a first current value is caused to flow through a welding wire and a base period in which a base current having a second current value is caused to flow through the welding wire. During the base period, a second peak current whose peak current value is a sum of a second current value and a third current value and is smaller than the first current value is superimposed on the base current at a second pulse frequency. A second peak period in which the second peak current is caused to flow once is shorter than the first peak period. During the first peak period, a droplet is transferred from the welding wire toward a base material.

Abstract: A laser welding device includes a welding head configured to emit a laser beam to a working point, a shield gas supplying nozzle configured to supply shield gas to the working point, and a high-speed air supplying nozzle configured to supply a high-speed air stream between the shield gas supplying nozzle and the welding head, the high-speed air stream having a flow rate that is larger than a flow rate of the shield gas, and being supplied in a horizontal direction directly above the shield gas supplied to the working point, or in a direction orthogonal to an emission direction of the laser beam. The high-speed air supplying nozzle is disposed in a range from 80 mm to 200 mm, both inclusive, above the working point, or in a range equal to or lower than a half of a working distance between an emission surface of the laser beam of the welding head and the working point, and supplies the high-speed air stream in a belt shape.

Abstract: A pulse welding period includes a first peak period for supplying a first peak current to a welding wire, a first base period for supplying a base current smaller than the first peak current to the welding wire, a second peak period for supplying a second peak current to the welding wire after alternately repeating the first peak period and the first base period (n?1) times (n is an integer equal to or larger than 2), and a second base period for supplying the base current to the welding wire. The second peak current is larger than the first peak current, and droplets are transferred from the welding wire during the second peak period or the second base period.

Abstract: In a consumable electrode-type arc welding in which pulse welding and short-circuit welding are alternately repeated, a welding current is controlled such that a welding current immediately before shifting from the pulse welding to the short-circuit welding is lower than a base current in a pulse.

Abstract: A laser welding control method according to the present disclosure includes: a first step of causing a first steel plate having a protrusion and a second steel plate to overlap so that a tip of the protrusion provided on the first steel plate makes contact with the second steel plate; and a second step of irradiating the protrusion with laser light in an irradiation pattern having a size larger than a size of the protrusion in plan view after the first step. At least one of a surface of the first steel plate that faces the second steel plate and a surface of the second steel plate that faces the first steel plate is plated.

Abstract: The laser welding method according to the present disclosure has a first step for forming a weld bead by irradiating an object to be welded with a laser beam along a first helical trajectory around a first center of rotation moving in a welding direction, and a second step for irradiating the object to be welded with a laser beam along a second helical trajectory around a second center of rotation moving in the welding direction. A diameter of rotation of the laser beam in the first step is larger than a diameter of rotation of the laser beam in the second step.

Abstract: A welding target is irradiated with a laser beam so as to form a beam spot that moves relatively with respect to the welding target along a locus having a spiral shape rotating around a rotation center moving in a welding direction. The welding target is welded using the laser beam irradiated with. While the welding target is irradiated with the laser beam, the welding target is irradiated with the laser beam based on an interval coefficient which is a value indicating an overlapping degree of the locus having the spiral shape in the welding direction.

Abstract: A plurality of scaly beads is formed and arranged continuously on a base material in welding cycle C that is a sum of arc ON period A during which welding current I flows to a welding wire and arc OFF period B during which welding current I does not flow to the welding wire. This arc welding control method includes: an initial condition setting step of setting initial values of welding conditions for arc-welding the base material; and a scaly bead formation step of forming the plurality of scaly beads in a predetermined welding section of the base material while moving the welding wire at welding speed Vw in the predetermined welding section of the base material. The welding conditions include arc ON period A and arc OFF period B, and further include at least one of welding current I, welding speed Vw, and interval G of the beads.

Abstract: As a conventional problem, welding on surface-treated material, such as a zinc-coated steel plate, considerably generates air holes including blowholes and also generates lots of spatters. Present invention provides a method of controlling arc welding performed in a manner that a short-circuit period, in which a short circuit is generated between a welding wire and an object to be welded, and an arc period, in which an arc is generated after release of the short circuit, are repeated alternately. According to the method, welding current is increased from an arc-regeneration-before current to a first welding current at a detection of release of the short circuit such that an increase gradient of the welding current becomes not less than 750 A/msec. This suppresses generation of air holes and spatters in welding work on a surface-treated material, such as a zinc-coated steel plate.

Abstract: In arc welding, determining a current value to be high in an early stage of the arc period is effective in reducing spatters caused by feeble short circuit in the arc period. In that case, to sharply decrease the voltage that has increased with increase in current, an inductance value of a reactor has to be kept small. However, a small inductance value causes a problem—weakness against disturbance. The present invention provides an arc welding control method that performs arc welding while repeating the short-circuit period and the arc period. According to the method, changing an inductance value relating to welding output in the arc period offers stable arc welding with fewer spatters and insusceptibility to disturbance.

Abstract: A laser welding method of the present disclosure includes the step of irradiating a workpiece with a laser beam in a helical shape along a weld part of the workpiece. The helical shape is a combination of a circular trajectory in which a laser beam is moved circularly, and a movement trajectory in which the laser beam is moved in a proceeding direction along the weld part. Furthermore, first energy of the laser beam moving so as to have a component of the proceeding direction in the circular trajectory is larger than second energy of the laser beam moving so as to have a component of an opposite direction to the proceeding direction in the circular trajectory.

Abstract: In controlling an arc welding of consumable electrode type in which pulse welding and short-circuit welding alternately repeat, forward feeding and backward feeding of a welding electrode periodically repeat in a short-circuit welding period. The forward feeding of the welding electrode starts when a welding current is smaller than a base current immediately before a pulse period ends.

Abstract: A laser machining system includes a laser oscillator, a laser machining head, and a reflection unit. The laser oscillator outputs laser light. The laser machining head, which includes a first optical member for collecting the laser light, emits the collected laser light. The reflection unit, which includes a reflective member for reflecting the laser light emitted from the laser machining head, radiates the reflected laser light onto a work.

Abstract: A method of controlling arc welding with a consumable electrode includes repeating the following periods in sequence: a short-circuit welding period to perform short-circuit arc welding; a pulse welding period to perform pulse welding; and a cooling period in which the welding current output is zero.

Abstract: A laser welding method of the present disclosure has a first step and a second step. In the first step, a first workpiece and a second workpiece are overlaid in a first machining region. In the second step, the first workpiece and the second workpiece are irradiated with laser beam in the first machining region while the laser beam is moved in a spiral path. Moreover, in the second step, the first workpiece and the second workpiece are melted by irradiation of the laser beam to form a liquid phase portion. Furthermore, in the second step, the laser beam is moved so that the liquid phase portion is not irradiated with the laser beam again.

Abstract: A laser welding device includes a welding head configured to emit a laser beam to a working point, a shield gas supplying nozzle configured to supply shield gas to the working point, and a high-speed air supplying nozzle configured to supply a high-speed air stream between the shield gas supplying nozzle and the welding head, the high-speed air stream having a flow rate that is larger than a flow rate of the shield gas, and being supplied in a horizontal direction directly above the shield gas supplied to the working point, or in a direction orthogonal to an emission direction of the laser beam. The high-speed air supplying nozzle is disposed in a range from 80 mm to 200 mm, both inclusive, above the working point, or in a range equal to or lower than a half of a working distance between an emission surface of the laser beam of the welding head and the working point, and supplies the high-speed air stream in a belt shape.