Welding Power Supply Dig Voltage Control
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Solution Overview
Problem
Conventional constant current welding power supplies lack flexibility in controlling the arc length and voltage, leading to unpredictable performance across different types of electrodes, particularly in the 'dig' control regime, where the voltage at which current increase begins is fixed, and arc length control is sloppy.
Innovation Solution
An adjustable power supply system that allows operators to set the initiation voltage for the 'dig' regime and adjust the constant current range based on the dig control setting, enabling predictable and rapid arc extension with reduced power input, suitable for various welding types including stick and TIG welding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If conventional constant current control is used with a fixed dig initiation voltage, then the power supply structure is simple, but the adaptability to different electrode types is poor
Solution Approach 1:
The patent implements adjustable dig initiation voltage and constant current range settings, transforming the fixed control parameters into dynamic, user-configurable values. This allows the power supply to adapt to different electrode types and welding conditions while maintaining a relatively simple control structure through parameterization rather than structural complexity
Solution Approach 2:
The patent changes the control parameters (dig initiation voltage and constant current range) to accommodate different electrode types. By allowing operators to adjust these parameters, the system achieves versatility without requiring complex structural modifications, directly resolving the contradiction between adaptability and device complexity
2Ease of operation
If the arc length control is relaxed to allow operator flexibility, then the ease of operation is improved, but the manufacturing precision of arc length control deteriorates
Solution Approach 1:
The patent implements a control system that provides feedback to the operator about the relationship between electrode position and power input. The system monitors arc conditions and adjusts power delivery accordingly, enabling operators to maintain flexibility in arc manipulation while achieving predictable and precise arc length control through the interactive feedback mechanism
3Adaptability or versatility
If the voltage at which dig regime begins is fixed, then the control system is simple, but the adaptability to different electrode performances is poor
Solution Approach 1:
The patent allows the dig initiation voltage to be adjusted as a configurable parameter rather than being fixed. This enables the control system to adapt to different electrode performances by changing the voltage threshold at which the dig regime activates, providing versatility without requiring complex additional hardware or control mechanisms
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
The system provides improved control over welding operations by allowing operators to customize the voltage at which current increases, accommodating different electrode types and ensuring predictable arc behavior, enhancing the precision and reliability of the welding process.
Implementation Method 1
application of electrical current through a welding torch, and thereby through an electrode and work piece to heat the work piece and the electrode
Implementation Method 2
Power supplies for stick welding of the type described above are often controlled in a constant current scheme, whereby the current applied to the electrode, and that passes through the arc and work piece, is maintained generally constant over a range of voltages
Data Source
AI summary
A technique is disclosed for controlling a constant current regime, such as for stick welding. The regime includes a dig segment or regime in which current is increased as voltage decreases. The dig regime is initiated at a voltage that can be set by an operator. The constant current regime also includes two distinct constant current segments separated by a transition segment. The transition segment occurs at a predetermined voltage, permitting rapid and predictable operation as an arc is lengthened during welding. The constant current segments may be suitable for different types of electrode. The dig selection also permits customizing the regime for soft or stiff digs that are initiated at different voltages (or arc lengths) suitable for different electrode types.