Pulse arc welding machine

Claim 2

A pulse arc welding machine comprising: a wire feeding unit for feeding a wire electrode to a base material to be welded; a base current source for supplying a base current between said wire electrode and said base material; base current setting means for controlling said base current source; a pulse current source for supplying a pulse current superposed on said base current flowing between said wire electrode and said base material; means for detecting an arc voltage of an arc discharge between said wire electrode and said base material; integrating means for integrating an output of said arc voltage detecting means; wire feeding speed instructing means for providing a first control signal representative of a desired wire feeding speed; wire feeding speed setting means for controlling said wire feeding unit in response to said first control signal; first function generating means for producing, in response to said first control signal, a second control signal representative of said arc voltage as a function of said first control signal; first comparing means for comparing an output of said integrating means with said second control signal; pulse width setting means for producing a third control signal representative of a pulse width in response to an output of said first comparing means; second function generating means for producing, in response to said first control signal, a fourth control signal representative of a pulse frequency as a function of said first control signal; pulse frequency setting means for producing, in response to said fourth control signal, a fifth control signal indicative of a pulse frequency, said fifth control signal being applied to said pulse current source for controlling a frequency of said pulse current; means for detecting a sum of said base current and said pulse current and providing a signal representative of said sum; amplifying means for amplifying said signal representative of said sum of said base current and said pulse current; pulse peak current selecting means for producing a sixth control signal representative of a current during a pulse peak period in response to said third and fifth control signals and an output of said amplifying means; second comparing means for comparing a fixed reference value with said sixth control signal; and pulse peak current setting means for controlling said pulse current source for setting a pulse peak current of said pulse current in response to an output of said second comparing means.

Claim 3

A pulse arc welding machine comprising: a wire feeding unit for feeding a wire electrode to a base material to be welded; a base current source for supplying a base current between said wire electrode and said base material; base current setting means for controlling said base current source; a pulse current source for supplying a pulse current superposed on said base current flowing between said wire electrode and said base material; means for detecting an arc voltage of an arc discharge between said wire electrode and said base material; integrating means for integrating an output of said arc voltage detecting means; wire feeding speed instructing means for providing a first control signal representative of a desired wire feeding speed; wire feeding speed setting means for controlling said wire feeding unit in response to said first control signal; first function generating means for producing, in response to said first control signal, a second control signal representative of said arc voltage as a function of said first control signal; first comparing means for comparing an output of said integrating means with said second control signal; pulse frequency setting means for producing, in response to an output of said first comparing means, a third control signal indicative of a pulse frequency; pulse width setting means for producing a fourth control signal representative of a pulse width in response to said second control signal; means for detecting a sum of said base current and said pulse current and providing a signal representative of said sum; amplifying means for amplifying said signal representing said sum of said base current and said pulse current; pulse peak current selecting means for producing a fifth control signal repesentative of a current during a pulse peak period in response to said third and fourth control signals and an output of said amplifying means; second comparing means for comparing a fixed reference value with said fifth control signal; and pulse peak current setting means for controlling said pulse current source for setting a pulse peak current of said pulse current in response to an output of said second comparing means.

Claim 4

A pulse arc welding machine comprising: a wire feeding unit for feeding a wire electrode to a base material to be welded; a base current source for supplying a base current between said wire electrode and said base material; base current setting means for controlling said base current source; a pulse current source for supplying a pulse current superposed on said base current flowing between said wire electrode and said base material; means for detecting an arc voltage of an arc discharge between said wire electrode and said base material; integrating means for integrating an output of said arc voltage detecting means; wire feeding speed instructing means for providing a first control signal representative of a desired wire feeding speed; wire feeding speed setting means for controlling said wire feeding unit in response to said first control signal; first function generating means for producing, in response to said first control signal, a second control signal representative of said arc voltage as a function of said first control signal; first comparing means for comparing an output of said integrating means with said second control signal; pulse frequency setting means for producing, in response to an output of said first comparing means, a third control signal indicative of a pulse frequency; pulse width setting means for producing a fourth control signal representative of a pulse width in response to said second control signal; means for detecting a sum of said base current and said pulse current and providing a signal representative of said sum; amplifying means for amplifying said signal representing said sum of said base current and said pulse current; pulse peak current selecting means for producing a fifth control signal repesentative of a current during a pulse peak period in response to said third and fourth control signals and an output of said amplifying means; second comparing means for comparing a fixed reference value with said fifth control signal; and pulse peak current setting means for controlling said pulse current source for setting a pulse peak current of said pulse current in response to an output of said second comparing means.

Claim 5

A pulse arc welding machine comprising: a wire feeding unit for feeding a wire electrode to a base material to be welded; a base current source for supplying a base current between said wire electrode and said base material; base current setting means for controlling said base current source; a pulse current source for supplying a pulse current superposed on said base current flowing between said wire electrode and said base material; means for detecting an arc voltage of an arc discharge between said wire electrode and said base material; integrating means for integrating an output of said arc voltage detecting means; wire feeding speed instructing means for providing a first control signal representative of a desired wire feeding speed; wire feeding speed setting means for controlling said wire feeding unit in response to said first control signal; first function generating means for producing, in response to said first control signal, a second control signal representative of said arc voltage as a function of said first control signal; first comparing means for comparing an output of said first integrating means with said second control signal to produce a third control signal; pulse width setting means for producing a fourth control signal representative of a pulse width in response to said second control signal; second function generating means for producing, in response to said first control signal, a fifth control signal representative of a pulse frequency as a function of said first control signal; pulse frequency setting means for producing, in response to said fifth control signal, a sixth control signal indicative of a pulse frequency, said sixth control signal being applied to said pulse current source for controlling a frequency of said pulse current; means for detecting a sum of said base current and said pulse current and providing a signal representative of said sum; amplifying means for amplifying said signal representative of said sum of said base current and said pulse current; pulse peak current selecting means for producing a seventh control signal representative of a current during a pulse peak period in response to said fourth and sixth control signals and an output of said amplifying means; second comparing means for comparing said third and seventh control signals; pulse peak current setting means for controlling said pulse current source for setting a pulse peak current of said pulse current in response to an output of said second comparing means.

Claim 6

A pulse arc welding machine comprising: a wire feeding unit for feeding a wire electrode to a base material to be welded; a base current source for supplying a base current between said wire electrode and said base material; base current setting means for controlling said base current source; a pulse current source for supplying a pulse current superposed on said base current flowing between said wire electrode and said base material; means for detecting an arc voltage of an arc discharge between said wire electrode and said base material; integrating means for integrating an output of said arc voltage detecting means; wire feeding speed instructing means for providing a first control signal representative of a desired wire feeding speed; wire feeding speed setting means for controlling said wire feeding unit in response to said first control signal; first function generating means for producing, in response to said first control signal, a second control signal representative of said arc voltage as a function of said first control signal; first comparing means for comparing an output of said first integrating means with said second control signal to produce a third control signal; pulse width setting means for producing a fourth control signal representative of a pulse width in response to said second control signal; second function generating means for producing, in response to said first control signal, a fifth control signal representative of a pulse frequency as a function of said first control signal; pulse frequency setting means for producing, in response to said fifth control signal, a sixth control signal indicative of a pulse frequency, said sixth control signal being applied to said pulse current source for controlling a frequency of said pulse current; means for detecting a sum of said base current and said pulse current and providing a signal representative of said sum; amplifying means for amplifying said signal representative of said sum of said base current and said pulse current; pulse peak current selecting means for producing a seventh control signal representative of a current during a pulse peak period in response to said fourth and sixth control signals and an output of said amplifying means; second comparing means for comparing said third and seventh control signals; pulse peak current setting means for controlling said pulse current source for setting a pulse peak current of said pulse current in response to an output of said second comparing means.

Claim 7

A pulse arc welding machine comprising: a wire feeding unit for feeding a wire electrode to a base material to be welded; a base current source for supplying a base current between said wire electrode an said base material; base current setting means for controlling said base current source; a pulse current source for supplying a pulse current superposed on said base current flowing between wire electrode and said base material; means for detecting an arc voltage of an arc discharge between said wire electrode and said base material; integrating means for integrating an output of said arc voltage detecting means; wire feeding speed instructing means for providing a first control signal representative of a desired wire feeding speed; wire feeding speed setting means for controlling said wire feeding unit in response to said first control signal; first function generating means for producing, in response to said first control signal, a second control signal representative of said arc voltage as a function of said first control signal; first comparing means for comparing an output of said integrating means with said second control signal to produce a third control signal; base current setting means for controlling said base current source for setting a magnitude of said base current in response to said third control signal; pulse width setting means for producing a fourth control signal representative of a pulse width in response to said third control signal; second function generating means for producing, in response to said first control signal, a fifth control signal representative of a pulse frequency as a function of said first control signal; pulse frequency setting means for producing, in response to said fifth control signal, a sixth control signal indicative of a pulse frequency, said sixth control signal being applied to said pulse current source for controlling a frequency of said pulse current; means for detecting a sum of said base current and said pulse current and providing a signal representative of said sum; amplifying means for amplifying said signal representative of said sum of said base current in said pulse current; pulse peak current selecting means for producing a seventh control signal representative of a current during a pulse peak period in response to said fourth and sixth control signals and an output of said amplifying means; second comparing means for comparing a fixed reference value with said seventh control signal; and pulse peak current setting means for controlling said pulse current source for setting a pulse peak current of said pulse current in response to an output of said second comparing means.

Claim 8

A pulse arc welding machine comprising: a wire feeding unit for feeding a wire electrode to a base material to be welded; a base current source for supplying a base current between said wire electrode an said base material; base current setting means for controlling said base current source; a pulse current source for supplying a pulse current superposed on said base current flowing between wire electrode and said base material; means for detecting an arc voltage of an arc discharge between said wire electrode and said base material; integrating means for integrating an output of said arc voltage detecting means; wire feeding speed instructing means for providing a first control signal representative of a desired wire feeding speed; wire feeding speed setting means for controlling said wire feeding unit in response to said first control signal; first function generating means for producing, in response to said first control signal, a second control signal representative of said arc voltage as a function of said first control signal; first comparing means for comparing an output of said integrating means with said second control signal to produce a third control signal; base current setting means for controlling said base current source for setting a magnitude of said base current in response to said third control signal; pulse width setting means for producing a fourth control signal representative of a pulse width in response to said third control signal; second function generating means for producing, in response to said first control signal, a fifth control signal representative of a pulse frequency as a function of said first control signal; pulse frequency setting means for producing, in response to said fifth control signal, a sixth control signal indicative of a pulse frequency, said sixth control signal being applied to said pulse current source for controlling a frequency of said pulse current; means for detecting a sum of said base current and said pulse current and providing a signal representative of said sum; amplifying means for amplifying said signal representative of said sum of said base current in said pulse current; pulse peak current selecting means for producing a seventh control signal representative of a current during a pulse peak period in response to said fourth and sixth control signals and an output of said amplifying means; second comparing means for comparing a fixed reference value with said seventh control signal; and pulse peak current setting means for controlling said pulse current source for setting a pulse peak current of said pulse current in response to an output of said second comparing means.

Claim 9

A pulse arc welding machine comprising: a wire feeding unit for feeding a wire electrode to a base material to be welded; a base current source for supplying a base current between said wire electrode and said base material; base current setting means for controlling said base current source; a pulse current source for supplying a pulse current superposed on said base current flowing between said wire electrode and said base material; means for detecting an arc voltage of an arc discharge between said wire electrode and said base material; integrating means for integrating an output of said arc voltage detecting means; wire feeding speed instructing means for providing a first control signal representative of a desired wire feeding speed; wire feeding speed setting means for controlling said wire feeding unit in response to said first control signal; first function generating means for producing, in response to said first control signal, a second control signal representative of said arc voltage as a function of said first control signal; first comparing means for comparing an output of said integrating means with said second control signal; pulse width setting means for producing a third control signal repesentative of a pulse width in response to an output of said first comparing means; second function generating means for producing, in response to said first control signal, a fourth control signal representative of a pulse frequency as a function of said first control signals; pulse frequency setting means for producing, in response to said fourth control signal, a fifth control signal indicative of a pulse frequency, said fifth control signal being applied to said pulse current source for controlling a frequency of said pulse current; means for detecting a sum of said base current and said pulse current and providing a signal representative of said sum; amplifying means for amplifying said signal representative of said sum of said base current and said pulse current; pulse peak current selecting means for producing a sixth control signal representative of a current during a pulse peak period in response to said third and fifth control signals and an output of said amplifying means; second comparing means for comparing a fixed reference value with said sixth control signal; and pulse peak current setting means for controlling said pulse current source for setting a pulse peak value of said pulse current in response to an output of said second comparing means.

Claim 10

A pulse arc welding machine comprising: a wire feeding unit for feeding a wire electrode to a base material to be welded; a base current source for supplying a base current between said wire electrode and said base material; base current setting means for controlling said base current source; a pulse current source for supplying a pulse current superposed on said base current flowing between said wire electrode and said base material; means for detecting an arc voltage of an arc discharge between said wire electrode and said base material; integrating means for integrating an output of said arc voltage detecting means; wire feeding speed instructing means for providing a first control signal representative of a desired wire feeding speed; wire feeding speed setting means for controlling said wire feeding unit in response to said first control signal; first function generating means for producing, in response to said first control signal, a second control signal representative of said arc voltage as a function of said first control signal; first comparing means for comparing an output of said integrating means with said second control signal; pulse width setting means for producing a third control signal repesentative of a pulse width in response to an output of said first comparing means; second function generating means for producing, in response to said first control signal, a fourth control signal representative of a pulse frequency as a function of said first control signals; pulse frequency setting means for producing, in response to said fourth control signal, a fifth control signal indicative of a pulse frequency, said fifth control signal being applied to said pulse current source for controlling a frequency of said pulse current; means for detecting a sum of said base current and said pulse current and providing a signal representative of said sum; amplifying means for amplifying said signal representative of said sum of said base current and said pulse current; pulse peak current selecting means for producing a sixth control signal representative of a current during a pulse peak period in response to said third and fifth control signals and an output of said amplifying means; second comparing means for comparing a fixed reference value with said sixth control signal; and pulse peak current setting means for controlling said pulse current source for setting a pulse peak value of said pulse current in response to an output of said second comparing means.