US 12,214,438 B2 · Spatter detection method

Abstract

A spot welding method includes supplying a welding current having a pulse-shaped waveform to a workpiece by alternately executing a step of maintaining the welding current within a set peak current range and a step of decreasing the welding current from the peak current range toward a bottom current and then increasing the welding current toward the peak current range when an effective value of the welding current reaches a set target range for a plurality of cycles. The spatter detection method includes measuring a pulse width IW(1), IW(2), . . . in each cycle of the pulse-shaped waveform and detecting the occurrence of spatter when a pulse width difference D(M)=IW(M)−IW(M−1) between a pulse width IW(M) in a target cycle (M-th cycle) and a pulse width IW(M−1) in a cycle immediately before the target cycle exceeds a width threshold value Dth.

Claims4

Dependent claims

A spatter detection method for detecting an occurrence of spatter in a spot welding method for joining a workpiece by supplying a welding current, wherein

the spot welding method includes supplying the welding current having a pulse-shaped waveform by alternately executing a step of maintaining the welding current within a set peak current range and a step of decreasing the welding current from the peak current range toward a bottom current and then increasing the welding current toward the peak current range when an effective value of the welding current reaches a set target range for a plurality of cycles,
the spatter detection method comprising measuring a pulse width in each cycle of the pulse-shaped waveform and detecting the occurrence of spatter when a difference between the pulse width in a target cycle and the pulse width in a cycle immediately before the target cycle exceeds a predetermined width.

Dependencies are inferred from the claim text.

Spatter detection method

Life of this patent

Spatter detection method

Life of this patent

Abstract

Claims4