Welding Parameter Lock Limits for Consistent Weld Quality

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Solution Overview

Problem

Conventional welding operations often suffer from varying outputs due to lack of continuous monitoring and adjustment of welding parameters, leading to potential weld quality issues.

Innovation Solution

A welding system with a user interface for setting and maintaining upper and lower command value limits for welding parameters, ensuring these parameters operate within predetermined ranges through a lock mode, preventing manual adjustments outside these limits.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If welding parameters are allowed to vary freely during operation, then operator flexibility and ease of adjustment are improved, but weld quality consistency and reliability deteriorate

Engineering Contradiction:
Improveoperator flexibilityVSAvoidweld quality consistency
Core Design Contradiction:
Ease of operationVSReliability

Solution Approach 1:

The patent establishes upper and lower command value limits for welding parameters, constraining them within predetermined ranges to ensure consistent weld quality while still allowing adjustment within acceptable boundaries. This resolves the contradiction by changing the parameter control mode from completely free to bounded flexibility.

Inventive Principle:
Principle #35Parameter changes

2Adaptability or versatility

If operator control over welding parameters is unrestricted, then adaptability to different welding conditions is improved, but manufacturing precision deteriorates

Engineering Contradiction:
Improveadaptability to welding conditionsVSAvoidweld quality
Core Design Contradiction:
Adaptability or versatilityVSManufacturing precision

Solution Approach 1:

The patent implements command value limits that define acceptable ranges for welding parameters. Operators can still adapt parameters within these bounds to suit different welding conditions, but the limits prevent adjustments that would compromise weld quality, thus resolving the contradiction between adaptability and precision.

Inventive Principle:
Principle #35Parameter changes

3Reliability

If welding parameters are continuously monitored and adjusted, then weld quality is improved, but device complexity and operational burden increase

Engineering Contradiction:
Improveweld qualityVSAvoidcontrol system complexity
Core Design Contradiction:
ReliabilityVSDevice complexity

Solution Approach 1:

The patent pre-establishes upper and lower command value limits for welding parameters before the welding operation begins. This preliminary action eliminates the need for continuous complex monitoring and adjustment during welding, as the limits are already set to ensure quality. This resolves the contradiction by moving the control complexity from ongoing operation to initial setup.

Inventive Principle:
Principle #10Preliminary action

Data Source

PatentEP3888834B1Welding-type system for control of welding parameter command value limits
Publication Date: 2023.10.18 ILLINOIS TOOL WORKS INC
  • EP3888834B1 patent drawingFigure 1A
  • EP3888834B1 patent drawingFigure 1B
  • EP3888834B1 patent drawingFigure 1C

AI summary

The present application relates to a welding type system (100) for inputting and/or receiving upper and lower command value limits for a plurality of welding parameters associated with a welding power source (102) and/or wire feeder (104). In some examples, the upper and lower command value limits correspond to an operating range of a respective welding parameter, such that a welding parameter command value is bound by the upper and lower command value limits in a lock mode during a welding operation. The upper and lower command value limits are set such that any change in a welding parameter value (e.g., an output value) during a welding operation is bound by the upper and lower command value limits when a lock mode is active.