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US 9,956,638 B2Granted
Electric arc welder for AC welding with cored electrode
AssigneeLincoln Global, Inc.
InventorsBadri K. Narayanan, Patrick T. Soltis, Elliott K. Stava, Russell K. Myers
Life of this patent
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Abstract
An electric arc welder having an inverter with a waveform generator that generates a welding waveform with a waveform period and a root mean square (RMS) level for maintaining a stable short welding arc based on at least a cored welding electrode. The electric arc welder having a circuit to adjust a wave balance of the welding waveform to maintain the stable short welding arc, where the wave balance is a ratio between a period of a positive portion of the welding waveform and the waveform period.
Claims29
An electric arc welder, comprising:
- an inverter with a waveform generator, said waveform generator generating a welding waveform with a waveform period and a root mean square (RMS) level for maintaining a stable short welding arc based on at least a cored welding electrode;
- a first input to said waveform generator to create a positive portion of said welding waveform, said positive portion having a first magnitude and having a first period;
- a second input to said waveform generator to create a negative portion of said welding waveform, said negative portion having a second magnitude and having a second period,
- wherein said first magnitude and said second magnitude are not the same;
- and,
- a circuit to adjust a wave balance of said welding waveform to maintain said stable short welding arc,
- wherein said wave balance is a ratio between said first period and said waveform period,
- wherein if an absolute value of said first magnitude is greater than an absolute value of said second magnitude then said wave balance is reduced to maintain said stable short welding arc and if said first magnitude absolute value is less than said second magnitude absolute value then said wave balance is increased to maintain said stable short welding arc, and
- wherein said welding waveform is a voltage waveform.
6 more elements
An electric arc welder, comprising:
- an inverter with a waveform generator, said waveform generator generating a welding waveform with a waveform period and a root mean square (RMS) level for maintaining a stable short welding arc based on at least a cored welding electrode;
- a first input to said waveform generator to create a positive portion of said welding waveform, said positive portion having a first magnitude and having a first period;
- a second input to said waveform generator to create a negative portion of said welding waveform, said negative portion having a second magnitude and having a second period,
- wherein said first magnitude and said second magnitude are not the same;
- and,
- a circuit to adjust a wave balance of said welding waveform to maintain said stable short welding arc,
- wherein said wave balance is a ratio between said first period and said waveform period,
- wherein if an absolute value of said first magnitude is greater than an absolute value of said second magnitude then said wave balance is reduced to maintain said stable short welding arc and if said first magnitude absolute value is less than said second magnitude absolute value then said wave balance is increased to maintain said stable short welding arc, and
- wherein if the first magnitude absolute value is greater than the second magnitude absolute value, said wave balance is maintained between 0.05 and 0.15.
6 more elements
An electric arc welder, comprising:
- an inverter with a waveform generator, said waveform generator generating a welding waveform with a waveform period and a root mean square (RMS) level for maintaining a stable short welding arc based on at least a cored welding electrode;
- a first input to said waveform generator to create a positive portion of said welding waveform, said positive portion having a first magnitude and having a first period;
- a second input to said waveform generator to create a negative portion of said welding waveform, said negative portion having a second magnitude and having a second period,
- wherein said first magnitude and said second magnitude are not the same;
- and,
- a circuit to adjust a wave balance of said welding waveform to maintain said stable short welding arc,
- wherein said wave balance is a ratio between said first period and said waveform period,
- wherein if an absolute value of said first magnitude is greater than an absolute value of said second magnitude then said wave balance is reduced to maintain said stable short welding arc and if said first magnitude absolute value is less than said second magnitude absolute value then said wave balance is increased to maintain said stable short welding arc, and
- wherein if the first magnitude absolute value is less than the second magnitude absolute value, said wave balance is maintained between 0.85 and 0.95.
6 more elements
An electric arc welder, comprising:
- an inverter with a waveform generator, said waveform generator generating a welding waveform with a waveform period and a root mean square (RMS) level for maintaining a stable short welding arc based on at least a cored welding electrode;
- a first input to said waveform generator to create a positive portion of said welding waveform, said positive portion having a first magnitude and having a first period;
- a second input to said waveform generator to create a negative portion of said welding waveform, said negative portion having a second magnitude and having a second period,
- wherein said first magnitude and said second magnitude are not the same;
- and,
- a circuit to adjust a wave balance of said welding waveform to maintain said stable short welding arc,
- wherein said wave balance is a ratio between said first period and said waveform period,
- wherein if an absolute value of said first magnitude is greater than an absolute value of said second magnitude then said wave balance is reduced to maintain said stable short welding arc and if said first magnitude absolute value is less than said second magnitude absolute value then said wave balance is increased to maintain said stable short welding arc, and
- wherein said first period is in the range of 5 to 15% of the waveform period.
6 more elements
An electric arc welder, comprising:
- an inverter with a waveform generator, said waveform generator generating a welding waveform with a waveform period and a root mean square (RMS) level based on at least a cored welding electrode;
- a first input to said waveform generator to create a positive portion of said welding waveform, wherein said positive portion has a first magnitude and a first period;
- a second input to said waveform generator to create a negative portion of said welding waveform, wherein said negative portion has a second magnitude and a second period, and wherein said first magnitude and said second magnitude are not the same;
- and
- a circuit to adjust a wave balance of said welding waveform to maintain said RMS level below an arc stability level,
- wherein said wave balance is a ratio between said first period and said waveform period, and wherein if an absolute value of said first magnitude is greater than an absolute value of said second magnitude then said wave balance is reduced to maintain said RMS level below said arc stability level and if said first magnitude absolute value is less than said second magnitude absolute value then said wave balance is increased to maintain said RMS level below said arc stability level and,
- wherein said welding waveform is a voltage waveform.
4 more elements
An electric arc welder, comprising:
- an inverter with a waveform generator, said waveform generator generating a welding waveform to maintain a stable welding arc based on at least a cored welding electrode, said welding waveform having a waveform period;
- a first input to said waveform generator to create a positive portion of said welding waveform, wherein said positive portion has a first magnitude and a first period;
- a second input to said waveform generator to create a negative portion of said welding waveform, wherein said negative portion has a second magnitude and a second period, and wherein said first magnitude and said second magnitude are not the same;
- and
- a circuit to adjust a wave balance of said welding waveform to maintain said stable welding arc,
- wherein said wave balance is a ratio between said first period and said waveform period,
- wherein if an absolute value of said first magnitude is greater than an absolute value of said second magnitude then said wave balance is reduced to maintain said stable welding arc and if said first magnitude absolute value is less than said second magnitude absolute value then said wave balance is increased to maintain said stable welding arc and,
- wherein said welding waveform is a voltage waveform.
5 more elements
An electric arc welder, comprising:
- an inverter with a waveform generator, said waveform generator generating a welding waveform with a waveform period and a root mean square (RMS) level based on at least a cored welding electrode;
- a first input to said waveform generator to create a positive portion of said welding waveform, wherein said positive portion has a first magnitude and a first period;
- a second input to said waveform generator to create a negative portion of said welding waveform, wherein said negative portion has a second magnitude and a second period, and wherein an absolute value of said first magnitude is greater than an absolute value of said second magnitude;
- and
- a circuit to adjust a wave balance of said welding waveform to maintain said RMS level below an arc stability level,
- wherein said wave balance is a ratio between said first period and said waveform period,
- wherein said wave balance is maintained between 0.05 and 0.5and,
- wherein said welding waveform is a voltage waveform.
5 more elements
An electric arc welder, comprising:
- an inverter with a waveform generator, said waveform generator generating a welding waveform with a waveform period and a root mean square (RMS) level based on at least a cored welding electrode;
- a first input to said waveform generator to create a positive portion of said welding waveform, wherein said positive portion has a first magnitude and a first period;
- a second input to said waveform generator to create a negative portion of said welding waveform, wherein said negative portion has a second magnitude and a second period, and wherein said first magnitude and said second magnitude are not the same;
- and
- a circuit to adjust a wave balance of said welding waveform and a difference between said first and second magnitudes to maintain said RMS level below an arc stability level,
- wherein said wave balance is a ratio between said first period and said waveform period,
- wherein if an absolute value of said first magnitude is greater than an absolute value of said second magnitude then said wave balance is reduced to maintain said RMS level below said arc stability level and if said first magnitude absolute value is less than said second magnitude absolute value then said wave balance is increased to maintain said RMS level below said arc stability level and,
- wherein said welding waveform is a voltage waveform.
5 more elements
An electric arc welder, comprising:
- an inverter with a waveform generator, said waveform generator generating a welding waveform with a waveform period and a root mean square (RMS) level based on at least a cored welding electrode;
- a first input to said waveform generator to create a positive portion of said welding waveform, wherein said positive portion has a first magnitude and a first period;
- a second input to said waveform generator to create a negative portion of said welding waveform, wherein said negative portion has a second magnitude and a second period, and wherein said first magnitude and said second magnitude are not the same;
- and
- a circuit to adjust a wave balance of said welding waveform to maintain said RMS level below an arc stability level,
- wherein said wave balance is a ratio between said first period and said waveform period,
- wherein if an absolute value of said first magnitude is greater than an absolute value of said second magnitude then said wave balance is reduced to maintain said RMS level below said arc stability level and if said first magnitude absolute value is less than said second magnitude absolute value then said wave balance is increased to maintain said RMS level below said arc stability level,
- wherein if the first magnitude absolute value is greater than the second magnitude absolute value said wave balance is maintained between 0.05 and 0.5, and if the first magnitude absolute value is less than the second magnitude absolute value said wave balance is maintained between 0.3 and 0.95and,
- wherein said welding waveform is a voltage waveform.
6 more elements
An electric arc welder, comprising:
- an inverter with a waveform generator, said waveform generator generating a welding waveform with a waveform period and a root mean square (RMS) level based on at least a cored welding electrode;
- a first input to said waveform generator to create a positive portion of said welding waveform, wherein said positive portion has a first magnitude and a first period;
- a second input to said waveform generator to create a negative portion of said welding waveform, wherein said negative portion has a second magnitude and a second period, and wherein said first magnitude and said second magnitude are not the same;
- and
- a circuit to adjust a wave balance of said welding waveform to maintain said RMS level below an arc stability level,
- wherein said wave balance is a ratio between said first period and said waveform period, and
- wherein if an absolute value of said first magnitude is greater than an absolute value of said second magnitude then said wave balance is reduced to maintain said RMS level below said arc stability level and if said first magnitude absolute value is less than said second magnitude absolute value then said wave balance is increased to maintain said RMS level below said arc stability level, and
- wherein if the first magnitude absolute value is greater than the second magnitude absolute value said wave balance is maintained between 0.05 and 0.15, and if the first magnitude absolute value is less than the second magnitude absolute value said wave balance is maintained between 0.85 and 0.95.
5 more elements
Dependencies are inferred from the claim text.