With Ignition By Retraction Patents (Class 219/124.01)
  • Patent number: 10537955
    Abstract: Disclosed is a method for controlling arc welding where an arc is generated between a welding wire as a consumable electrode and an object to be welded. The method includes: keeping a wire feed speed at a predetermined constant speed in a steady-state welding period; and at a time point when welding termination is ordered, either switching the wire feed speed from the predetermined constant speed to a wire feed speed at which the welding wire is fed in alternating forward and backward directions, or decreasing the wire feed speed from the predetermined constant speed with time, and then switching the wire feed speed to the wire feed speed at which the welding wire is fed in alternating forward and backward directions at a time point when a predetermined time period has passed since when welding termination was ordered.
    Type: Grant
    Filed: March 20, 2014
    Date of Patent: January 21, 2020
    Assignee: Panasonic Intellectual Property Management Co., Ltd.
    Inventors: Junji Fujiwara, Atsuhiro Kawamoto, Masaru Kowa
  • Patent number: 10065258
    Abstract: There is provided an arc welding control method of alternating feeding of a welding wire between forward feeding and reverse feeding periodically to generate a short-circuiting period and an arc period in a manner that shifting to the arc period is performed by reducing a welding current in the reverse feeding during the short-circuiting period. Reduction of the welding current is started from a time where a state of the reverse feeding reaches a predetermined reference state.
    Type: Grant
    Filed: March 10, 2015
    Date of Patent: September 4, 2018
    Assignee: DAIHEN CORPORATION
    Inventor: Akihiro Ide
  • Patent number: 9040873
    Abstract: The invention includes a wire feed system that is used within a welder, the system having a forward drive roll that rotates in a first direction, a reverse drive roll that rotates in a second direction, which is opposite the first direction, wherein the forward drive roll and the reverse drive roll are both located on a first side of a wire, a first idle roll disposed opposite the forward drive roll, a second idle roll disposed opposite the reverse drive roll, wherein the first idle roll and the second idle roll are located on a second side of the wire, an arm that pivotally couples the first idle roll to the second idle roll, and an actuator that displaces the first idle roll to engage with the forward drive roll to advance the wire or displaces the second idle roll to engage with the reverse drive roll to retract the wire based upon a predetermined condition.
    Type: Grant
    Filed: July 15, 2014
    Date of Patent: May 26, 2015
    Assignee: Lincoln Global, Inc.
    Inventors: Steven R. Peters, Edward A. Enyedy
  • Patent number: 9029734
    Abstract: The subject embodiments relate to a retractable wire feed system used within a welder, which include a friction-drive system disposed on a first side of a wire, an idle drive roll located opposite the friction-drive system on a second side of a wire, wherein the friction-drive system advances the wire through a welding nozzle toward a workpiece, and a brake, which is applied to retract the wire when a predetermined condition is met.
    Type: Grant
    Filed: July 15, 2014
    Date of Patent: May 12, 2015
    Assignee: Lincoln Global, Inc.
    Inventors: Steven R. Peters, Edward A. Enyedy
  • Patent number: 7842904
    Abstract: A torch is moved by a manipulator in a direction separating from a base material 7 while a wire is supplied, whereby an actuator driving the robot manipulator can control a velocity of the wire for a workpiece by a unidirectional operation of separating the torch, and vibration due to reverse of torch velocity is not generated. Further, by using a dedicated separation control system, velocity follow-up performance of the actuator moving the torch can be heightened without increasing overshoot in the usual operation time, and the acceleration and deceleration time of the manipulator can be reduced.
    Type: Grant
    Filed: October 18, 2005
    Date of Patent: November 30, 2010
    Assignee: Panasonic Corporation
    Inventors: Hiroyuki Nakata, Yasushi Mukai, Tatsuya Ikeda, Naoto Masunaga, Masaru Kowa, Yasuyoshi Honuchi
  • Patent number: 7525066
    Abstract: In a consumable electrode type welding method, while feeding a welding wire 1, a welding torch 4 is moved by a robot manipulator 9 in a direction where the welding torch 4 is pulled apart from a base metal 7, so that an initial arc is generated while the welding wire 1 is separated from the base metal 7. This not only can eliminate the need for the reversing operation of the robot manipulator 9 and thus can reduce the waste time to thereby be able to reduce a tact time but also can stabilize an arc in the welding start portion and thus can reduce the “unexpected stop” effectively.
    Type: Grant
    Filed: June 27, 2005
    Date of Patent: April 28, 2009
    Assignee: Panasonic Corporation
    Inventors: Yasushi Mukai, Atsuhiro Kawamoto, Tatsuya Ikeda, Hiroyuki Nakata, Masaru Kowa
  • Publication number: 20080169276
    Abstract: In a conventional consumable electrode type welding method, owing to the need of the reversing operation of a robot manipulator, an extra response time as well as acceleration and deceleration times are necessary and, at the same time, the feed speed of a welding wire is not be able to catch up with the melting speed of the welding wire to thereby extend the length of an arc, resulting in the unstable arc. In a consumable electrode type welding method according to the invention, while feeding a welding wire 1, a welding torch 4 is moved by a robot manipulator 9 in a direction where the welding torch 4 is pulled apart from a base metal 7, so that an initial arc is generated while the welding wire 1 is separated from the base metal 7. This not only can eliminate the need for the reversing operation of the robot manipulator 9 and thus can reduce the waste time to thereby be able to reduce a tact time but also can stabilize an arc in the welding start portion and thus can reduce the “unexpected stop” effectively.
    Type: Application
    Filed: June 27, 2005
    Publication date: July 17, 2008
    Applicant: Matsushita Electric Industrial Co., Ltd.
    Inventors: Yasushi Mukai, Atsuhiro Kawamoto, Tatsuya Ikeda, Hiroyuki Nakata, Masaru Kowa
  • Publication number: 20080149606
    Abstract: An arc start control method is provided for consumable electrode arc welding. According to this method, a welding wire, supplied through a welding torch, is brought into contact with a work. Then, an initial current is applied to the welding wire and the work that are held in contact with each other. Then, an initial arc is generated by moving the welding wire away from the work with the application of the initial current maintained, and thereafter the initial arc is changed to a steady arc. The initial current is increased gradually with a predetermined increase rate for a predetermined period of time starting at beginning of the application of the initial current.
    Type: Application
    Filed: September 12, 2007
    Publication date: June 26, 2008
    Applicant: DAIHEN Corporation
    Inventor: Toshiro Uezono
  • Publication number: 20080149610
    Abstract: A method and apparatus for controlling a welding-type power supply includes providing a current wave form having an arc current portion and a short circuit current portion. An arc state is entered by retracting a welding wire, and a short circuit state is entered by advancing the wire. The current enters the arc current portion prior to the creation of the arc and the current enters the short circuit current portion prior to the creation of the short, by coordinating the wave form with the wire retraction. This may be preformed on a wire having a diameter of 2.4 mm or more to a weld and applying a welding current of less than 100 amps, or of less than 35 amps. One current waveform during the arc state includes at least three segments, and the last segment is entered into prior to the short circuit state being entered, and is the same current magnitude as the current magnitude at the start of the short circuit state.
    Type: Application
    Filed: February 20, 2008
    Publication date: June 26, 2008
    Applicant: Illinois Tool Work Inc.
    Inventors: Gerd A. Huismann, Peter A. Hennecke, Richard M. Hutchison, Lori L. Kuiper, Tim A. Matus
  • Patent number: 7339135
    Abstract: A system and method for stabilizing a welding arc is disclosed. The method of initiating the arc includes the steps of defining a wire feed speed based on a user selected wire feed speed and then abruptly reducing the wire feed speed before the wire feed speed reaches a relatively stabilized speed for welding, thereby allowing a welding arc to initiate and propagate to a generally steady state.
    Type: Grant
    Filed: July 22, 2004
    Date of Patent: March 4, 2008
    Assignee: Illinois Tool Works Inc.
    Inventors: James Lee Uecker, Robert Raimund Davidson, Charles Lyle Kaufman, Michael Todd Klegin
  • Publication number: 20080047941
    Abstract: A welder power supply apparatus (10) includes an inverter (20), which is driven intermittently when an electrode (34) and a workpiece (36) are separated from each other and no arc is being generated between them, whereby power loss generated in the inverter (20) when the inverter (20) is driven in the non-load state of the power supply apparatus and power loss caused by exciting current flowing through an transformer (24) disposed in the output of the inverter (20) can be reduced. The inverter (20) is driven continuously when output current (Io) becomes higher than a threshold value (Ib) after the electrode (34) and the workpiece (36) are brought into contact with each other for starting arcing between them.
    Type: Application
    Filed: July 24, 2007
    Publication date: February 28, 2008
    Applicant: SANSHA ELECTRIC MANUFACTURING COMPANY, LIMITED
    Inventors: Takeshi Morimoto, Kenzo Danjo, Tetsuro Ikeda, Hideo Ishii
  • Publication number: 20070289958
    Abstract: Apparatus for supporting a work-piece during an additive process where material is added to a first surface of the work-piece. The support has a thermally conductive heat-sink adapted to act against a reverse side of the work-piece to that to which material is added thereby supporting the work-piece. The thermally conductive heat-sink is mounted to a biasing means that in use biases the thermally conductive heat-sink against the reverse side of the work-piece.
    Type: Application
    Filed: June 1, 2007
    Publication date: December 20, 2007
    Inventors: Daniel Clark, Barry D Smith, Alexander Kutscherawy, George W Whitehurst
  • Publication number: 20040074884
    Abstract: An apparatus for initiating a welding arc during a welding process includes a power circuit to provide a welding power to a power output, a background circuit to provide a background power to the power output to maintain the welding arc during the arc-starting process, and a controller. The background circuit provides a background voltage to the power output of the welding device and detects when the motion control device has touched the electrode to the workpiece. Upon detection of a short circuit, the controller starts a timer, and enables the power circuit to provide a steady state, or DC, flow of output current to the power output for a predetermined time period to heat both the electrode and the workpiece to lower the start current needed to form the welding arc. The time period may vary depending on the electrode and the workpiece being used.
    Type: Application
    Filed: October 17, 2002
    Publication date: April 22, 2004
    Applicant: SSCO Manufacturing, Inc., a California Corporation
    Inventors: Brian K. Butler, Gennadiy Dombrovskiy