Method of detecting root gap and arc welding method using the former
First Claim
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1. A root gap detecting method in an arc welding process, comprising the steps of:
- controlling a weld seam tracking and a welding torch height;
detecting a waveform of a welding voltage or a welding current of a welding arc;
storing the waveform of said welding voltage or said welding current under an appropriate welding condition to a reference gap Gref as a reference waveform;
obtaining the area |Δ
SG| of a deviation part of a detected waveform to said reference waveform;
obtaining Δ
SG by judging a positive and a negative of |Δ
SG|;
experimentally determining the relationship between the value of Δ
SG and a root gap G in advance; and
calculating the root gap G from the value of Δ
SG.
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Abstract
The weld seam tracking and the welding torch height are controlled, the waveform of the welding voltage or the welding current of the arc is detected, the waveform of the above-described welding voltage or welding current under an appropriate welding condition to a reference gap Gref is stored as a reference waveform, the area |ΔSG| of a deviation part of the detected waveform to the above-described reference waveform is obtained, ΔSG is obtained by judging the positive and negative of |ΔSG|, the relationship between the value of ΔSG and the root gap G is experimentally determined in advance, and the root gap G is calculated from the value of ΔSG.
9 Citations
9 Claims
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1. A root gap detecting method in an arc welding process, comprising the steps of:
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controlling a weld seam tracking and a welding torch height; detecting a waveform of a welding voltage or a welding current of a welding arc; storing the waveform of said welding voltage or said welding current under an appropriate welding condition to a reference gap Gref as a reference waveform; obtaining the area |Δ
SG| of a deviation part of a detected waveform to said reference waveform;obtaining Δ
SG by judging a positive and a negative of |Δ
SG|;experimentally determining the relationship between the value of Δ
SG and a root gap G in advance; andcalculating the root gap G from the value of Δ
SG. - View Dependent Claims (2, 3, 4)
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5. An arc welding method, comprising the steps of:
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controlling a weld seam tracking and a welding torch height; detecting a waveform of a welding voltage or a welding current of an arc; storing the waveform of said welding voltage or said welding current under an appropriate welding condition to a reference gap Gref as a reference waveform; obtaining an area |Δ
SG| of a deviation part of the detected waveform to said reference waveform;obtaining Δ
SG by judging a positive and a negative of |Δ
SG|;experimentally determining the relationship between the value of Δ
SG and a root gap G in advance;calculating the root gap G from the value of Δ
SG;determining allowable ranges +Δ
g1, -Δ
g2 of the root gap G in achieving the welding under an appropriate welding condition to the reference gap Gref ;obtaining allowable ranges +Δ
S1, -Δ
S2 of the differential waveform Δ
SG from the relationship between said Δ
SG and G; andchanging the welding condition to a preset appropriate welding condition for the gap of G=Gref +Δ
g1 or G=Gref -Δ
g2 when said Δ
SG is deviated from said allowable range. - View Dependent Claims (6, 7, 8, 9)
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Specification