Method and apparatus for electric arc welding
AssigneeLincoln Global, Inc.
InventorsElliott K. Stava, Peter Nicholson, Christopher Hsu
Life of this patent
Estimating the term…
Abstract
An electric arc welding apparatus for depositing molten metal from an advancing welding wire into a weld puddle in an open root between two juxtapositioned plates where the root extends in a welding path and is formed by converging walls terminating in generally parallel walls spaced to define a gap, which apparatus comprises a contact holder with a wire outlet, a switching power supply directing welding current to the wire as the wire passes from the outlet toward the open root, with the advancing wire defining an electrode stick out between the contact holder and the weld puddle, a circuit for sensing the length of the stick out, and control means for adjusting the welding current as a function of the sensed stick out length.
Claims36
An electric arc welding apparatus for depositing molten metal from an advancing welding wire into a weld puddle in an open root between two juxtapositioned plates, said root extending in a welding path and being formed by converging walls terminating in generally parallel walls spaced to define a gap, said apparatus comprising:
- a contact holder with a wire outlet, a switching power supply directing welding current to said wire as said wire passes from said outlet toward said root, said advancing wire defining an electrode stick out between said contact holder and said weld puddle, a circuit for sensing the length of said stick out and control means for adjusting said welding current as an inverse function of said sensed stick out length.
A method for depositing molten metal from an advancing welding wire into a weld puddle in an open root between two juxtapositioned plates, said root extending in a welding path and being formed by converging walls terminating in generally parallel walls spaced to define a gap, said method comprising the acts of:
- (a) directing welding current to said wire as said wire advances toward said root;
- (b) sensing the length of said stick out of said wire;
- and,
- (c) adjusting said welding current as an inverse function of said sensed stick out length.
An electric arc welding apparatus for depositing molten metal from an advancing welding wire into a weld puddle in a joint between two juxtapositioned plates, said joint extending in a welding path and being formed by converging walls, said apparatus comprising:
- a contact holder with a wire outlet, a switching power supply directing welding current to said wire as said wire advances from said outlet toward said joint, said advancing wire defining an electrode stick out between said contact holder and said weld puddle, a circuit for sensing the length of said stick out, and means for reducing said welding current when said sensed stick out length exceeds a given value.
An electric arc welding apparatus for depositing molten metal from an advancing welding wire into a weld puddle in a joint between two juxtapositioned plates, said joint extending in a welding path and being formed by converging walls, said apparatus comprising:
- a contact holder with a wire outlet, a switching power supply directing welding current to said wire as said wire advances from said outlet toward said joint, said advancing wire defining an electrode stick out between said contact holder and said weld puddle, a circuit sensing the length of said stick out, and means for increasing said welding current when said sensed stick out length is less than a given value.
A method for depositing molten metal from an advancing welding wire into a weld puddle in a joint between two juxtapositioned plates, said joint extending in a welding path and being formed by converging walls, a contact holder with a wire outlet, said method comprising:
- (a) directing welding current to said wire as said wire advances from said outlet toward said joint;
- (b) sensing the length of the stick out of said wire;
- and,
- (c) reducing said welding current when said sensed stick out length exceeds a given value.
A method for depositing molten metal from an advancing welding wire into a weld puddle in a joint between two juxtapositioned plates, said joint extending in a welding path and being formed by converging walls, a contact holder with a wire outlet, said method comprising:
- (a) directing welding current to said wire as said wire advances from said outlet toward said joint;
- (b) sensing the length of the stick out of said wire;
- and,
- (c) increasing said welding current when said sensed stick out length is less than a given value.
An electric arc welding apparatus for depositing molten metal from an advancing wire into a weld puddle in an open root joint between two juxtapositioned plates, said root being formed by converging walls terminating in generally parallel walls spaced to define a gap, said apparatus including a circuit for creating a stick out signal proportional to the stick out length of the wire and a device to adjust the heat in said puddle in inverse relationship to said stick out signal.
A method for depositing molten metal from an advancing wire into a weld puddle in an open root joint between two juxtapositioned plates, said joint being formed by converging walls terminating in generally parallel walls spaced to define a gap, said method comprising:
- (a) creating a stick out signal proportional to the stick out length of the wire;
- and,
- (b) adjusting the heat in inverse proposition to said stick out signal.
An electric arc welding apparatus for depositing molten metal from an advancing welding wire into a weld puddle in a joint between two juxtapositioned plates, said joint extending in a welding path and being formed by converging walls, said apparatus comprising:
- a contact holder with a wire outlet, a switching power supply directing welding current to said wire as said wire passes from said outlet toward said joint, said advancing wire defining an electrode stick out between said contact holder and said weld puddle, a circuit for sensing the length of said stick out and control means for adjusting said welding current as an inverse function of said sensed stick out length.
A method for depositing molten metal from an advancing welding wire into a weld puddle in an joint between two juxtapositioned plates, said joint extending in a welding path and being formed by converging walls, said method comprising the acts of:
- (a) directing welding current to said wire as said wire advances toward said joint;
- (b) sensing the length of said stick out of said wire;
- and,
- (c) adjusting said welding current as an inverse function of said sensed stick out length.
An electric arc welding apparatus for depositing molten metal from an advancing welding wire into a weld puddle, said apparatus comprising:
- a contact holder with a wire outlet, said advancing wire defining an electrode stick out between said contact holder and said weld puddle, a short circuit arc welder for causing a welding current at different levels to pass through said welding wire in a succession of welding cycles, each of said welding cycles including an arcing condition during which said wire is spaced from said puddle where energy applied to said wire forms a molten ball on the end of said wire and a short circuit condition during which said molten metal ball on the end of said wire first contacts said puddle and then transfers from said wire to said puddle by a necking action breaking said molten ball from said wire, means for sensing stick out during the short circuit condition of said welding cycles and means for adjusting said welding current in response to said sensed stick out to control the heat of said puddle.
A short circuit electric arc welding apparatus for depositing molten metal from an advancing wire into a weld puddle, said apparatus including a circuit for creating a stick out signal proportional to the stick out length of the wire and a device to adjust the heat in said puddle in relationship an inverse to said stick out signal.
Dependencies are inferred from the claim text.