Welding Circuit Coupling Detection for Arc Interference Compensation

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Solution Overview

Problem

Interfering coupling between welding circuits in a welding system affects the welding process, making it challenging to maintain consistent arc length and quality due to induced voltages and currents, which conventional methods struggle to accurately determine and compensate for, especially in complex production conditions.

Innovation Solution

A method involving applying a predetermined current profile in one welding circuit to detect voltage and current changes in another, allowing for the determination of ohmic and inductive coupling factors, which are then used to calculate a compensation voltage to adjust the welding current and reduce interference.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If multiple welding circuits are used in a welding system, then productivity is improved by simultaneous welding of multiple workpieces, but interfering coupling between circuits causes harmful induced voltages and currents that deteriorate welding quality and arc consistency

Engineering Contradiction:

Improvesimultaneous welding capacityVSAvoidinterfering coupling effects

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent implements a feedback mechanism where the actual welding current in the affected circuit is continuously measured and compared with the target current value. The difference (deviation) caused by interfering coupling is detected, and the control system automatically adjusts the welding parameters to compensate for this deviation, maintaining consistent welding quality despite the presence of multiple simultaneous welding circuits

Inventive Principle:

Principle #23Feedback

Solution Approach 2:

The patent changes welding parameters dynamically based on detected coupling effects. When interfering coupling is detected through current measurement and analysis, the system adjusts parameters such as pulse timing, current amplitude, or voltage levels to compensate for the harmful induced effects, thereby maintaining welding quality while preserving high productivity

Inventive Principle:

Principle #35Parameter changes

2Device complexity

If conventional methods are used to handle interfering coupling, then device complexity is kept low, but measurement precision and ability to determine coupling factors are insufficient

Engineering Contradiction:

Improvesystem structureVSAvoidcoupling determination accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent replaces complex physical isolation mechanisms with an electronic control approach. Instead of using physical barriers or complex circuit isolation hardware to prevent coupling effects, the system uses electronic sensing, measurement, and software-based compensation algorithms to detect and correct for interfering coupling, achieving high measurement precision without significantly increasing hardware complexity

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The system performs self-diagnosis and self-correction by automatically detecting coupling effects through current measurement and independently adjusting its own welding parameters to compensate for the interference, eliminating the need for external calibration equipment or complex manual adjustment mechanisms

Inventive Principle:

Principle #25Self-service

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

This approach effectively determines and compensates for interfering coupling, improving the consistency and quality of the welding process by minimizing the impact of induced voltages and currents, leading to better control over the welding arc and reduced residual coupling effects.

Implementation Method 1

an arc being produced between the tip of the welding wire electrode and the surface of the workpiece

Methodology Applied

Scientific EffectElectric arc: Electric Arc

Implementation Method 2

The welding circuit inductance L of the welding circuit SSK is understood to be the property whereby the welding circuit counteracts each change in current with a dynamic resistance

Methodology Applied

Scientific EffectElectromagnetic induction: Electromagnetic Induction

Implementation Method 3

The welding circuit resistance R is formed by the sum of all resistances of all lines and connections flowed through by the welding current I

Methodology Applied

Scientific EffectJoule heating: Joule Heating

Data Source

PatentUS20220001477A1Method for Determining an Interfering Coupling Between Welding Circuits of a Welding System

Publication Date: 2022.01.06 FRONIUS INT GMBH

AI summary

A method for determining an interfering coupling between welding circuits (2-i) of a welding system (1) comprises the following steps:applying (S1) a predetermined current profile (SP) in a first welding circuit (2-1) of the welding system (1);detecting (S2) a voltage progression and/or current progression thus induced in a second welding circuit (2-2) of the welding system (1), anddetermining (S3) the interfering coupling on the basis of the current profile (SP) of the current applied in the first welding circuit (2-1) and of the voltage progression and/or current progression detected in the second welding circuit (2-2).