Two-Channel Arc Welding Ignition With Sequential Two-Frequency Control
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Solution Overview
Problem
Existing welding arc ignition systems pose safety risks due to high-voltage discharges and electromagnetic interference, and they interfere with electronic devices, necessitating a safer and more stable arc discharge method.
Innovation Solution
A two-channel device is employed, comprising a power transformer and a high-frequency generator, with a timer-controlled power supply and current meter, to apply high-frequency and low-frequency voltages sequentially for arc ignition, minimizing electromagnetic interference and ensuring stable arc discharge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If high-voltage discharge is used for arc ignition, then arc ignition reliability is improved, but safety risk and electromagnetic interference increase
Solution Approach 1:
The ignition system is divided into two separate channels: a first channel with a high-voltage generator for creating the initial spark gap breakdown, and a second channel with a power transformer for sustaining the arc. This segmentation allows the high-voltage impulse to be time-limited and isolated, reducing electromagnetic interference while maintaining ignition reliability
Solution Approach 2:
The high-voltage generator in the first channel performs preliminary action by creating a spark gap breakdown before the main welding arc is established. This preliminary ionization of the air gap facilitates subsequent arc ignition from the power transformer without requiring continuous high-voltage discharge, thereby reducing electromagnetic interference
2Reliability
If high-voltage discharge is used for arc ignition, then arc ignition reliability is improved, but safety risk increases
Solution Approach 1:
The system separates the high-voltage ignition function from the main power delivery function into distinct channels. The first channel uses a high-voltage generator only for initial spark creation, while the second channel uses a power transformer for sustained arc. This segmentation limits the duration and scope of high-voltage exposure, reducing safety risks
Solution Approach 2:
The spark gap acts as an intermediary element that is broken down by the high-voltage generator to create a conductive path. Once the spark gap is ionized, the main power transformer can deliver current through this pre-ionized path without requiring continuous high-voltage discharge, thereby reducing safety hazards
3Manufacturing precision
If high-frequency energy is applied throughout the welding process, then welding quality is improved, but device complexity increases
Solution Approach 1:
The controller periodically switches between the first channel (high-voltage generator) and the second channel (power transformer) based on welding process requirements. During ignition phase, the high-voltage channel is activated; during sustained welding, the power transformer channel is used. This periodic switching achieves high-quality welding with high-frequency energy only when necessary, avoiding continuous complexity
Solution Approach 2:
The controller serves multiple functions: it manages the high-voltage generator for ignition, controls the power transformer for sustained welding, and coordinates the switching between channels. This multi-functionality consolidates control logic into a single component, reducing overall device complexity while enabling high-frequency energy application during critical welding phases
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 two-frequency arc discharge provides reliable, stable, and high-quality welding with reduced spatter and electrode sticking, achieving weld seams comparable to DC welding without the need for reactive elements, while minimizing electromagnetic interference.
Implementation Method 1
In the course of ignition an arc discharge, atmospheric air or other gas is ionized in proximity of a contact point of an electrode and articles to be welded by providing a predetermined amount of energy
Implementation Method 2
a power supply further comprising a power transformer; and a controller of said power transformer
Implementation Method 3
a resonant circuit connected in series to said high-frequency generator
Implementation Method 4
The current conducting duct is heated, its electric resistance decreases and an arc is ignited
Data Source
AI summary
Methods and devices for two-channel welding arc ignition and, more particularly, to ionizing an area of a contact between an electrode and articles to be welded. Methods and devices for igniting an arc discharge and welding.