Osaka, Japan
Osaka, Japan

Time filter

Source Type

Patent
Daihen Corporation | Date: 2017-01-25

The purpose of the present invention is to improve the stability of arc welding carried out by cyclical repetition of forward feed and reverse feed of a weld wire (1). Provided is an arc welding control method involving repeated forward feed and reverse feed at a weld wire (1) feed rate (Fw), according to a prescribed cycle (Tf) and a prescribed amplitude (Wf), and generation of short-circuit time intervals and arc time intervals to carry out welding, wherein the feed rate (Fw) cycle (Tf) and/or the amplitude (Wf) are set automatically on the basis of the average feed rate (Far) and the welding rate (Wsr), or the wire deposition amount (Md) per unit of weld length. Further, in the event that the amplitude (Wf) has changed, feedback control of the forward feed-side shift amount (Sf) is carried out in such a way that the average value of the feed rate (Fw) is constant. In so doing, the feed rate (Fw) cycle (Tf) and amplitude (Wf) are always set to optimal values, and stable welding conditions can be maintained.


Patent
Daihen Corporation | Date: 2017-03-01

The purpose of the present invention is to improve the stability of welding conditions in a welding method that involves cyclically repeating forward feed and reverse feed of a welding wire. Provided is an arc welding control method involving cyclic repetition of forward feed and reverse feed of a welding wire at feed speed (Fw), generating short-circuit intervals and arc intervals, during which arc intervals, application of a first welding current (Iw1) is followed by application of a second welding current (Iw2) smaller than the first welding current (Iw1), wherein the phase of the feed speed (Fw) at the point in time (t21) of transition from an arc interval to a short-circuit interval is detected, and the value (Iw1) and/or the application duration (Tw1) of the first welding current (Iw1) is varied in accordance with the detected phase. In so doing, fluctuation of the phase of the feed speed due to outside disturbances during generation of short-circuiting can be minimized, and therefore the stability of the welding conditions can be improved.


Patent
Daihen Corporation | Date: 2017-01-18

The purpose of the present invention is to reduce the amount of spatter production without detecting constrictions in a welding method in which forward feed and backward feed of welding wire is repeated cyclically. The feed speed (Fw) of the welding wire is switched cyclically between forward feed and backward feed to produce a short-circuit period and an arc period, and the welding current (Iw) is reduced during backward feed in the short-circuit period to shift to the arc period. The reduction in the welding current (Iw) is begun at the time point (t31) at which the backward feed state (Bd) has reached a predetermined standard state. The backward feed duration, the backward feed speed, the backward feed phase, or the backward feed quantity is used as this backward feed state (Bd). Due to this configuration, without detecting constrictions, the welding current (Iw) can be reduced by just an appropriate amount of time before the time point (t33) at which an arc is produced again, and this makes it possible to reduce the amount of spatter production.


Patent
Daihen Corporation and Osaka Institute of Technology | Date: 2016-11-16

A metal powder contains not less than 0.10 mass% and not more than 1.00 mass% of at least one of chromium and silicon, and a balance of copper. The total content of the chromium and the silicon is not more than 1.00 mass%. In accordance with an additive manufacturing method for this metal powder, an additively-manufactured article made from a copper alloy is provided. The additively-manufactured article has both an adequate mechanical strength and an adequate electrical conductivity.


Patent
Daihen Corporation and Osaka Institute of Technology | Date: 2016-05-11

A metal powder contains not less than 0.10 mass % and not more than 1.00 mass % of at least one of chromium and silicon, and a balance of copper. The total content of the chromium and the silicon is not more than 1.00 mass %. In accordance with an additive manufacturing method for this metal powder, an additively-manufactured article made from a copper alloy is provided. The additively-manufactured article has both an adequate mechanical strength and an adequate electrical conductivity.


Patent
Daihen Corporation | Date: 2016-01-07

There is provided a carrier device that has a linkage arm mechanism, in particular, a carrier device that cools the linkage arm mechanism and can reduce the impact of radiation heat from a work that is in a high temperature state. A carrier device is a carrier device that includes a linkage arm mechanism and a pivot shaft, and the linkage arm mechanism includes lower arms and upper arms, and one ends of which are respectively connected to the lower arms, and horizontal movement members that support a work that is connected to the other ends of the upper arms, and cooling plates are respectively arranged between the upper arms, and the horizontal movement members.


A control circuit reduces switching loss by periodically stopping switching elements, and reduces the difference between the time for which positive switching elements are in on state and the time for which negative switching elements are in on state. The control circuit includes a command value signal generator generating command value signals Xu1, Xv1, and Xw1 from line voltage command value signals Xuv, Xvw, and Xwu, and includes a PWM signal generator generating PWM signals by the command value signals Xu1, Xv1, and Xw1. The command value signals Xu1, Xv1, and Xw1 are continuously at 0 for a predetermined period, and are continuously at 2 for another period. This enables reducing the difference between the period for which the PWM signals are low and the period for which they are high1.


Patent
Daihen Corporation | Date: 2016-11-16

To achieve a good welding state by stabilizing a feeding state of a welding wire, in arc welding of alternating feeding of the welding wire between a forward feeding and a reverse feeding periodically according to a push-pull feeding control. The welding is performed in a manner of feeding the welding wire according to the push-pull feeding control using a push-side feeding motor which rotates in the forward feeding direction at a constant feeding rate based on a push feeding-rate correction signal Ps and a pull-side feeding motor which alternates a forward feeding rotation and a reverse feeding rotation periodically based on a pull feeding-rate setting signal Fr, and generating short-circuiting periods and arc periods. An average feeding rate Fad of the pull-side feeding motor is detected and the push feeding-rate correction signal Ps is corrected to the detected average feeding rate Fad of the pull-side feeding motor. Consequently, even if a feeding resistance changes and hence the average feeding rate Fad of the pull-side feeding motor changes, as a feeding rate Fd of the push-side feeding motor is controlled to follow the average feeding rate, the feeding state of the welding wire becomes stable.


Patent
Daihen Corporation | Date: 2016-11-23

To stabilize arc welding in which feeding of a welding wire is altered between forward feeding and reverse feeding periodically. The welding is performed in a manner of alternating the feeding of the welding wire between the forward feeding and the reverse feeding periodically according to a feeding rate pattern of a feeding-rate setting signal Fr constituted of a forward feeding amplitude Ws, a reverse feeding amplitude Wr, a forward feeding period Ts and a reverse feeding period Tr, stored in correspondence to an average feeding-rate setting signal Far, and generating short-circuiting periods and arc periods. An average value of a feeding rate Fw during the welding is detected, and at least one of the forward feeding amplitude Ws, the reverse feeding amplitude Wr, the forward feeding period Ts or the reverse feeding period Tr is changed so that the average value of the feeding rate Fw equals the average feeding-rate setting signal Far, and thereby the feeding rate pattern is automatically corrected. Consequently, even if a feeding resistance of a feeding path changes, as the average value of the feeding rate Fw is always maintained at a constant value, stability of a welding state can be improved.


Patent
Daihen Corporation | Date: 2016-06-03

A method is provided for evaluating the reliability of an electrical power measuring device for measuring high-frequency electrical power. To build an evaluation system, the measuring device, together with a reference electrical power measuring device, is arranged between a high-frequency power supply device and an artificial reproduction load, which includes an impedance conversion device and a reference load. Using this system, an uncertainty range of an electrical power measured value measured by the measuring device is calculated, according to a prescribed calculation formula, from the electrical power measured value, and a judgment is made as to whether or not the electrical power measured value measured by the measuring device is within the uncertainty range. If it is within the uncertainty range, the measuring device is evaluated as being reliable, while if it is not within the uncertainty range, the measuring device is evaluated as being unreliable.

Loading Daihen Corporation collaborators
Loading Daihen Corporation collaborators