JOHN R PARKS
Engineers in Cleveland, OH

4866247, Sep 12, 1989

Nov 14, 1988

7/270766

John M. Parks - Solon OH
Elliott K. Stava - Brecksville OH

The Lincoln Electric Company - Cleveland OH

B23K 909

219137PS

Apparatus and method to reduce spatter and allow better semi-automatic welding in short circuiting arc welding of the type using a single D. C. power supply for causing a welding current to pass through a welding wire extending variable distances from a holder and between the welding wire and a workpiece at a molten metal pool on the workpiece. The welding current flows in response to an arc voltage while the welding wire is fed from the holder toward the workpiece whereby the welding wire is subjected to a succession of welding cycles each of which include an arcing condition during which the wire is spaced from the pool and a short circuit condition during which a molten metal ball formed on the end of the wire contacts the metal pool and then transfers from the wire to the workpiece by a necking action. In this type of welding operation, the invention involves the application of a preselected amount of energy into the wire during the arcing condition for each welding cycle, which preselected amount of energy slightly exceeds the known value of energy necessary to melt a given volume of metal to form a consistent molten metal ball onto the end of the wire. This constant energy is divided between the resistance heating of the wire extending from the wire holder and the anode heating caused by the arc during each arcing condition of a cycle.

5003154, Mar 26, 1991

Jul 3, 1989

7/374755

John M Parks - Solon OH
Elliott K. Stava - Brecksville OH

The Lincoln Electric Company - CLeveland OH

B23K 909

219137PS

Apparatus and method to reduce splatter and allow better semi-automatic welding in short circuiting arc welding of the type using a single D. C. power supply for causing a welding current to pass through a welding wire extending variable distances from a holder and between the welding wire and a workpiece at a molten pool on the workpiece. The welding current flows in response to an arc voltage while the welding wire is fed from the holder toward the workpiece whereby the welding wire is subjected to a succession of welding cycles each of which include an arcing condition during which the wire is spaced from the pool and a short circuit condition during which a molten metal ball formed on the end of the wire contacts the metal pool and then transfers from the wire to the workpieced by a necking action. A preselected, constant amount of energy is applied to the wire during the arcing condition for each welding cycle.

4954691, Sep 4, 1990

Apr 24, 1989

7/343238

John M. Parks - Solon OH
Elliott K. Stava - Brecksville OH

The Lincoln Electric Company - Cleveland OH

B23K 910

219137PS

A method and device for controlling a power supply for arc welding in a manner to reduce spatter when the power supply is employed for depositing metal from a welding wire or electrode onto a workpiece by the short circuiting transfer mode wherein a welding current causes the welding wire to alternate between a short circuit condition and an arc condition with metal transfer occurring during a short circuit condition. This method and device includes the concept of shifting the welding current to a background current value in response to a short circuit condition, holding the welding current generally at the background current level for a preselected time, then allowing the welding current to reach the normal unimpeded current level, and causing the holding step to be terminated before the selected time in response to a detected arc condition. This concept provides a predetermined low current condition immediately upon establishing a short circuit between the welding wire or electrode and the workpiece, which low current condition is retained long enough to convert what otherwise would be a spatter-laden momentary short circuit to a short circuit where metal is transferred to the workpiece. Further, the method and device detects the slope of the welding current or voltage and shifts the welding current to the low background current level when the welding current reaches its maximum value just before breakage of the metal from the wire thus reducing the spatter energy when the molten metal breaks from the wire.

4835360, May 30, 1989

Oct 7, 1987

7/105345

John M. Parks - Solon OH
Elliott K. Stava - Brecksville OH

The Lincoln Electric Company - Cleveland OH

B23K 909

219137PS

A method and device for controlling a power supply for arc welding in a manner to reduce spatter when the power supply is employed for depositing metal from a welding wire or electrode onto a workpiece by the short circuiting transfer mode wherein a welding current causes the welding wire to alternate between a short circuit condition and an arc condition with metal transfer occurring during a short circuit condition. This method and device includes the concept of shifting the welding current to a background current value in response to a short circuit condition, holding the welding current generally at the background current level for a preselected time, then allowing the welding current to reach the normal unimpeded current level, and causing the holding step to be terminated before the selected time in response to a detected arc condition. This concept provides a predetermined low current condition immediately upon establishing a short circuit between the welding wire or electrode and the workpiece, which low current condition is retained long enough to convert what otherwise would be a spatterladen momentary short circuit to a short circuit where metal is transferred to the workpiece. Further, the method and device detects the slope of the welding current or voltage and shifts and welding current to the low background current level when the welding current reaches its maximum value just before breakage of the metal from the wire thus reducing the spatter energy when the molten metal breaks from the wire.

4897523, Jan 30, 1990

Feb 10, 1989

7/310022

John M. Parks - Solon OH
Elliott K. Stava - Brecksville OH

The Lincoln Electric Company - Cleveland OH

B23K 909

219137PS

In a short circuiting arc welding apparatus and method wherein a continuously fed welding wire alternates between an arcing condition during which the wire is spaced from the molten pool of the workpiece and a short circuit condition during which the melted metal on the end of the welding wire is in contact with the molten metal pool and thereafter transfers to the workpiece by a necking action breaking the melted metal from the wire, there is provided an improvement including providing a first high inductance current control circuit for continuously directing a low level, arc sustaining, background current between the welding wire and the workpiece and providing a second current control circuit for controlling current flow during the arcing condition of the process. This second current control circuit includes time delay means for causing the initiating arc at the start of the arcing condition to have an area determined primarily by the background current for a preselected time during which the molten metal on the tip of the welding wire and in the molten metal pool are drawn, by surface tension, to the wire and pool respectively, is essentially quelled and means for then passing a high current pulse through the arc between the wire and pool with a preselected energy for melting a relatively constant volume of metal on the end of the wire and spaced from the pool. This high energy pulse is near the start of the arcing condition and terminates generally before the mid-point of the arcing condition so that the wire is first melted and then driven into the molten metal pool after the pool has essentially quelled or become quiescent.

4717807, Jan 5, 1988

Dec 11, 1986

6/940580

John M. Parks - Solon OH
Elliott K. Stava - Brecksville OH

The Lincoln Electric Company - Cleveland OH

B23K 909

21913021

A method and device for controlling a power supply for arc welding in a manner to reduce spatter when the power supply is employed for depositing metal from a welding wire or electrode onto a workpiece by the short circuiting transfer mode wherein a welding current causes the welding wire to alternate between a short circuit condition and an arc condition with metal transfer occurring during a short circuit condition. This method and device includes the concept of shifting the welding current to a background current value in response to a short circuit condition, holding the welding current generally at the background current level for a preselected time, then allowing the welding current to reach the normal unimpeded current level, and causing the holding step to be terminated before the selected time in response to a detected arc condition. This concept provides a predetermined low current condition immediately upon establishing a short circuit between the welding wire or electrode and the workpiece, which low current condition is retained long enough to convert what otherwise would be a spatter-laden momentary short circuit to a short circuit where metal is transferred to the workpiece. Further, the method and device detects the slope of the welding current or voltage and shifts the welding current to the low background current level when the welding current reaches its maximum value just before breakage of the metal from the wire thus reducing the spatter energy when the molten metal breaks from the wire.