Preheating Power Supply Isolation for Stable Weld Current
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Solution Overview
Problem
Conventional welding systems face inconsistencies in weld current due to the superimposition of preheating and welding current paths, leading to variations in arc start conditions and energy dissipation, which affect the quality and consistency of the weld.
Innovation Solution
The implementation of a forward voltage increase circuit and a bypass path prevention circuit within the welding power source interconnection cables and preheating power supplies, respectively, to prevent weld current flow through the preheating power supply by increasing the forward voltage drop, ensuring that the weld current flows through the welding power supply path instead.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If preheating and welding current paths are superimposed in conventional welding systems, then the system structure is simplified, but weld current consistency deteriorates due to variations in arc start conditions and energy dissipation
Solution Approach 1:
The patent divides the power supply system into separate preheating and welding current paths. The preheating power supply and welding power supply are electrically isolated, with each providing current through dedicated circuits. This segmentation prevents the superimposition of current paths, ensuring that weld current remains consistent and不受 preheating current variations affecting arc start conditions
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of a preheating circuit that is electrically isolated from the welding circuit. The preheating power supply provides current through a separate path that does not interfere with the welding current flow, acting as an intermediary that enables preheating without compromising weld current consistency
2Reliability
If preheating and welding current paths are separated into independent circuits, then weld current consistency is improved, but device complexity increases
Solution Approach 1:
The patent implements a multi-functional power supply system where a single welding power supply unit can operate in multiple modes: providing welding current through the welding circuit, providing preheating current through the preheating circuit, or providing both simultaneously through isolated parallel paths. This universality reduces the need for completely separate power supplies while maintaining current path separation
Solution Approach 2:
The patent enables preliminary preheating action through a dedicated preheating circuit that can be activated before welding begins. The preheating power supply prepares the workpiece by delivering controlled current through an isolated path, ensuring the workpiece is preheated to the desired temperature before welding current is applied, thereby improving weld quality without requiring complex integrated 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
This solution stabilizes the weld current flow, reducing inconsistencies and improving the reliability and quality of the welding process by maintaining a consistent arc start and minimizing energy dissipation.
Implementation Method 1
The implementation of a forward voltage increase circuit and a bypass path prevention circuit within the welding power source interconnection cables and preheating power supplies, respectively, to prevent weld current flow through the preheating power supply by increasing the forward voltage drop
Implementation Method 2
Electrical power is applied to the welding wire and a circuit is completed through the workpiece to sustain a welding arc
Implementation Method 3
Electrical power is applied to the welding wire and a circuit is completed through the workpiece to sustain a welding arc that melts the electrode wire and the workpiece
Implementation Method 4
sustain a welding arc that melts the electrode wire and the workpiece to form the desired weld
Implementation Method 5
a welding arc that melts the electrode wire and the workpiece to form the desired weld
Data Source
AI summary
Systems, methods, and apparatus to control weld current in a preheating system are disclosed. An example preheating power supply includes power conversion circuitry configured to output welding-type power via a first output power connector and a second output power connector, and a bypass path prevention circuit configured to prevent less than a threshold voltage applied to the first output power connector and the second output power connector from a different power supply from causing current to flow between the first output power connector and the second output power connector.