Welder monitor
First Claim
1. A welder monitor for monitoring a welding quality of materials sandwiched between and welded by two electrodes, said welder monitor comprising:
- a detection means for detecting a welding current flowing between the two electrodes and a welding voltage applied between the two electrodes;
an operation means for numerically analyzing, based on a heat conduction model, a temperature distribution of the two electrodes and that of the materials using the welding current and welding voltage both detected by said detection means, to thereby estimate a nugget diameter during welding;
a reference diameter setting means for setting a reference nugget diameter;
a diameter comparing means for comparing the nugget diameter during welding with the reference nugget diameter, to thereby compute a time at which the nugget diameter exceeds the reference nugget diameter;
a reference time setting means for setting a reference time shorter than a given time until which welding of intended materials is not terminated;
a time comparing means for comparing a nugget formation time, at which the nugget diameter during welding exceeds the reference nugget diameter, with the reference time set by said reference time setting means; and
an output means for outputting a comparison result from said time comparing means;
whereby when the nugget formation time is shorter than the reference time, the nugget formation time is outputted to said output means.
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Accused Products
Abstract
The welding quality of materials sandwiched between and welded by two electrodes is monitored by a welder monitor, which includes a detecting section for detecting a welding current and a welding voltage, an operation section for numerically analyzing, based on a heat conduction model, a temperature distribution of the two electrodes and that of the materials using the detected welding current and welding voltage, to thereby estimate a nugget diameter during welding, a reference diameter setting section for setting a reference nugget diameter, and a diameter comparing section for comparing the nugget diameter during welding with the reference nugget diameter, to thereby compute a time at which the nugget diameter exceeds the reference nugget diameter. The welder monitor also includes a reference time setting section for setting a reference time shorter than a given time until which welding of intended materials is not terminated, a time comparing section for comparing a nugget formation time, at which the nugget diameter during welding exceeds the reference nugget diameter, with the reference time set by the reference time setting section, and an output section for outputting a comparison result from the time comparing section. When the nugget formation time is shorter than the reference time, the nugget formation time is outputted to the output section.
18 Citations
5 Claims
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1. A welder monitor for monitoring a welding quality of materials sandwiched between and welded by two electrodes, said welder monitor comprising:
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a detection means for detecting a welding current flowing between the two electrodes and a welding voltage applied between the two electrodes; an operation means for numerically analyzing, based on a heat conduction model, a temperature distribution of the two electrodes and that of the materials using the welding current and welding voltage both detected by said detection means, to thereby estimate a nugget diameter during welding; a reference diameter setting means for setting a reference nugget diameter; a diameter comparing means for comparing the nugget diameter during welding with the reference nugget diameter, to thereby compute a time at which the nugget diameter exceeds the reference nugget diameter; a reference time setting means for setting a reference time shorter than a given time until which welding of intended materials is not terminated; a time comparing means for comparing a nugget formation time, at which the nugget diameter during welding exceeds the reference nugget diameter, with the reference time set by said reference time setting means; and an output means for outputting a comparison result from said time comparing means; whereby when the nugget formation time is shorter than the reference time, the nugget formation time is outputted to said output means.
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2. A welder monitor for monitoring a welding quality of materials sandwiched between and welded by two electrodes, said welder monitor comprising:
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a detection means for detecting a welding current flowing between the two electrodes and a welding voltage applied between the two electrodes; an operation means for numerically analyzing, based on a heat conduction model, a temperature distribution of the two electrodes and that of the materials using the welding current and welding voltage both detected by said detection means, to thereby estimate a nugget diameter during welding; a reference diameter setting means for setting a reference nugget diameter; a diameter comparing means for comparing the nugget diameter during welding with the reference nugget diameter, to thereby compute a time at which the nugget diameter exceeds the reference nugget diameter, said diameter comparing means comprising; a storage means for storing a plurality of times at which the nugget diameter has exceeded the reference nugget diameter; and an average value computing means for computing an average value of the plurality of times stored in said storage means; a reference time setting means for setting a reference time; a time comparing means for comparing the average value computed by said average value computing means with the reference time set by said reference time setting means; and an output means for outputting a comparison result from said time comparing means.
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3. A welder monitor for monitoring a welding quality of materials sandwiched between and welded by two electrodes, said welder monitor comprising:
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a detection means for detecting a welding current flowing between the two electrodes and a welding voltage applied between the two electrodes; an operation means for numerically analyzing, based on a heat conduction model, a temperature distribution of the two electrodes and that of the materials using the welding current and welding voltage both detected by said detection means, to thereby estimate a nugget diameter during welding; a reference diameter setting means for setting a reference nugget diameter; a diameter comparing means for comparing the nugget diameter during welding with the reference nugget diameter, to thereby compute a time at which the nugget diameter exceeds the reference nugget diameter; a counter means for counting the number of welding times; and an output means for outputting at least one of the time computed by said diameter comparing means and the number of welding times counted by said counter means. - View Dependent Claims (4, 5)
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Specification