Spot Welding Spatter Detection via Peak-Hold Voltage Differences
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Solution Overview
Problem
Existing spatter detection methods in spot welding require a voltage detection line near the electrode chips, which is prone to high temperatures and frequent replacement, increasing costs and cycle time.
Innovation Solution
A spatter detection method using a voltage sensor in the welding power circuit to detect voltage changes during pulse-shaped welding current cycles, determining spatter occurrence by analyzing differences and averages of voltage detection values between cycles, thereby avoiding the need for a new voltage detection line near the electrodes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a voltage detection line is provided in the vicinity of electrode chips to detect spatter, then spatter detection accuracy is improved, but device complexity and maintenance costs increase due to exposure to high temperatures
Solution Approach 1:
The patent uses the welding power circuit as an intermediary to detect voltage changes that indicate spatter. Instead of placing a detection line directly near the electrodes, the system monitors voltage fluctuations in the existing power circuit, which serve as a mediator to indirectly detect spatter conditions without exposing sensitive components to high temperatures.
Solution Approach 2:
The welding power circuit serves dual purposes: it provides welding current and simultaneously enables spatter detection through voltage monitoring. The existing power circuit components are utilized for detection without requiring separate dedicated detection infrastructure, allowing the system to self-monitor its own operational state.
2Speed
If a voltage detection line is placed near electrode chips for real-time spatter detection, then spatter detection speed is improved, but maintenance frequency increases due to high temperature exposure
Solution Approach 1:
The power circuit acts as an intermediary that allows remote detection of spatter conditions. By monitoring voltage changes in the power circuit rather than using a detection line in the high-temperature zone, the system achieves real-time detection capability while keeping the monitoring components in a cooler, more maintainable location.
Solution Approach 2:
The patent replaces the physical voltage detection line mechanism with an electrical monitoring approach using existing power circuit parameters. Instead of mechanically placing a detection line near electrodes, the system uses electrical signal analysis (voltage fluctuations) to infer spatter conditions, eliminating the need for high-temperature resistant detection components.
3Measurement precision
If additional voltage detection lines are installed near electrodes for spatter monitoring, then detection capability is improved, but manufacturing costs increase
Solution Approach 1:
The welding power circuit is designed to perform multiple functions: it provides welding current and simultaneously enables spatter detection through voltage monitoring. This multi-functionality eliminates the need for separate dedicated detection infrastructure, reducing overall system cost while maintaining detection capability.
Solution Approach 2:
The existing power circuit components serve dual purposes, with the same hardware used for both welding operations and spatter detection. This self-service approach allows the system to monitor its own operational state without requiring additional investment in separate detection systems.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Accurately detects spatter occurrence without additional voltage detection lines, reducing maintenance costs and cycle time by utilizing existing sensors to monitor voltage changes during welding.
Implementation Method 1
a voltage sensor configured to detect a voltage in the welding power circuit
Implementation Method 2
supplying a pulse-shaped welding current to the workpiece, the pulse-shaped welding current being generated when the welding power circuit alternately repeats power distribution control and a power distribution pause over a plurality of cycles
Implementation Method 3
In spot welding, power is distributed between a pair of electrode chips in a state in which the plurality of metal plates as workpieces is sandwiched between the pair of electrode chips
Data Source
AI summary
A spot welding method using a welding apparatus includes supplying a pulse-shaped welding current to a workpiece, the pulse-shaped welding current being generated when a welding power circuit alternately repeats power distribution control and a power distribution pause over a plurality of cycles, and maintaining, under the power distribution control, the welding current within a set peak current range in a peak holding section. A spatter detection method includes: a step of acquiring an average value of voltage detection values Vpv detected by a voltage sensor in the peak holding section for each of the cycles; and a step of determining whether or not the spatter occurs, based on a difference value between an average value of the voltage detection values Vpv in the peak holding section for an N-th cycle and an average value of the voltage detection values Vpv in the peak holding section for an (N−1)-th cycle.