Welding Arc Starting Pulses for Reduced Open-Circuit Voltage

Solution Overview

Problem

Conventional welding power supplies waste energy by maintaining high open circuit voltage when no welding is occurring, leading to delayed arc initiation and non-compliance with equipment standards, especially in processes like SMAW, GMAW, and GTAW.

Innovation Solution

Implementing a series of voltage pulses with short durations and rest periods, monitored by current and voltage sensors, to reduce average open circuit voltage, transitioning to welding power upon arc initiation, and stabilizing the arc through controlled voltage pulses.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional welding power supplies maintain high open circuit voltage continuously, then arc initiation capability is improved, but energy consumption increases and equipment standards compliance deteriorates

Engineering Contradiction:

Improvearc initiation capabilityVSAvoidenergy consumption

Core Design Contradiction:

ReliabilityVSUse of energy by moving object

Solution Approach 1:

The patent implements periodic voltage pulses instead of continuous high voltage maintenance. The control circuitry outputs voltage pulses at specific intervals during idle periods, reducing average open circuit voltage while maintaining arc initiation capability when needed. This periodic action resolves the contradiction by providing voltage only when necessary for arc starting.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system detects idle conditions in advance and proactively reduces open circuit voltage before energy waste occurs. By monitoring welding process state and transitioning to idle mode detection, the system prepares to reduce voltage output preemptively, ensuring energy savings without compromising arc initiation when welding actually begins.

Inventive Principle:

Principle #10Preliminary action

2Use of energy by moving object

If open circuit voltage is reduced to comply with equipment standards, then energy consumption is reduced, but arc initiation response time deteriorates

Engineering Contradiction:

Improveenergy consumptionVSAvoidarc initiation response time

Core Design Contradiction:

Use of energy by moving objectVSSpeed

Solution Approach 1:

The system detects idle conditions in advance and proactively reduces open circuit voltage before energy waste occurs. By monitoring welding process state and transitioning to idle mode detection, the system prepares to reduce voltage output preemptively, ensuring energy savings without compromising arc initiation when welding actually begins.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The control circuitry outputs voltage pulses at specific intervals during idle periods, reducing average open circuit voltage while maintaining arc initiation capability when needed. This periodic action resolves the contradiction by providing voltage only when necessary for arc starting.

Inventive Principle:

Principle #19Periodic action

3Reliability

If continuous high open circuit voltage is maintained, then arc stabilization is improved, but energy waste increases during idle periods

Engineering Contradiction:

Improvearc stabilizationVSAvoidenergy waste

Core Design Contradiction:

ReliabilityVSLoss of energy

Solution Approach 1:

The control circuitry outputs voltage pulses at specific intervals during idle periods, reducing average open circuit voltage while maintaining arc initiation capability when needed. This periodic action resolves the contradiction by providing voltage only when necessary for arc starting.

Inventive Principle:

Principle #19Periodic action

Solution Approach 2:

The system dynamically adjusts open circuit voltage based on real-time detection of welding process state. During idle periods, voltage is reduced through pulsing; during active welding, voltage is maintained at appropriate levels for arc stabilization. This dynamic adaptation resolves the contradiction between energy waste and arc stabilization.

Inventive Principle:

Principle #15Dynamics

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

Reduces power consumption, ensures rapid arc initiation under sub-optimal conditions, and maintains compliance with equipment standards by providing efficient energy use and improved welding performance.

Implementation Method 1

systems and methods to provide welding-type arc starting and stabilization with reduced open circuit voltage

Methodology Applied

Scientific EffectElectric Arc: Electric Arc

Data Source

PatentUS12539552B2Systems and methods to provide welding-type arc starting and stabilization with reduced open circuit voltage

Publication Date: 2026.02.03 ILLINOIS TOOL WORKS INC

AI summary

Systems and methods to provide welding-type arc starting and stabilization with reduced open circuit voltage are disclosed. An example welding-type power supply includes: power conversion circuitry configured to convert input power to welding-type power; and control circuitry configured to: control the power conversion circuitry to output a voltage pulse at a first voltage; determine whether the power conversion circuitry outputs current during the voltage pulse; in response to determining that there is less than a threshold output current during the voltage pulse, control the power conversion circuitry to turn off an output or output a second voltage that is less than the first voltage; and in response to determining that the power conversion circuitry outputs at least the threshold output current during the voltage pulse, control the power conversion circuitry to output the welding-type power.