Arc Welding Control Method with Dynamic Inductance Adjustment
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Solution Overview
Problem
Conventional arc welding methods generate excessive spatters due to sensitivity to reactor inductance value settings, leading to unstable welding conditions and reduced quality, particularly in high-speed and gap welding.
Innovation Solution
The arc welding control method dynamically changes the inductance value related to welding output during the arc period, employing current control initially followed by voltage control, and adjusting inductance values multiple times to optimize current and voltage responses, thereby reducing spatters and enhancing welding stability and speed.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If current control is applied in early arc period with high current values, then spatters are reduced, but short circuit occurrence is suppressed and welding periodicity deteriorates
Solution Approach 1:
The patent applies dynamic control by switching between current control and voltage control modes at different stages of the welding cycle. In the early arc period, current control is used to reduce spatters, while in the stable arc period, voltage control is used to maintain periodicity. This dynamic switching resolves the contradiction between spatter reduction and welding periodicity.
Solution Approach 2:
The welding cycle is segmented into distinct periods: early arc period and stable arc period. Each period has its own control strategy optimized for that specific phase. This segmentation allows the system to address spatter reduction in the early period without compromising periodicity in the stable period.
2Reliability
If voltage control is applied in early arc period, then short circuit occurrence is facilitated, but spatters increase
Solution Approach 1:
The patent applies preliminary current control in the early arc period before transitioning to voltage control. This preliminary action of current control suppresses spatter generation at the critical moment when the arc is first established, preventing harmful spatters before they can occur.
3Device complexity
If fixed inductance value is used, then device complexity is reduced, but welding quality and adaptability deteriorate
Solution Approach 1:
The patent implements dynamic inductance adjustment that changes the inductance value based on the welding stage and conditions. In the early arc period, one inductance value is used to control spatters, while in the stable arc period, a different inductance value maintains periodicity. This dynamic adjustment improves bead consistency without requiring complex real-time calculation systems.
Solution Approach 2:
The patent changes the inductance parameter at different stages of the welding cycle to optimize performance. By adjusting the inductance value according to the welding phase, the system achieves better manufacturing precision and adaptability while maintaining relatively simple device architecture.
4Productivity
If high welding speed is pursued, then productivity increases, but welding stability and quality deteriorate
Solution Approach 1:
The patent uses dynamic control strategies that adapt to high-speed welding conditions. By switching between current and voltage control modes and adjusting inductance values dynamically, the system maintains welding stability even at high speeds, enabling both high productivity and reliable quality.
Solution Approach 2:
The patent employs periodic control actions that synchronize with the welding cycle at high speeds. The controlled switching between current control and voltage control, along with inductance adjustments, creates a periodic pattern that maintains stability during high-speed operation, preventing quality deterioration.
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 approach significantly reduces spatters, improves welding quality by increasing short circuit periodicity, and makes the process less susceptible to disturbances, resulting in more consistent bead widths and reduced risk of burn-through.
Implementation Method 1
arc welding where welding operation is performed with an arc generated between a wire and a base material
Data Source
AI summary
In arc welding, determining a current value to be high in an early stage of the arc period is effective in reducing spatters caused by feeble short circuit in the arc period. In that case, to sharply decrease the voltage that has increased with increase in current, an inductance value of a reactor has to be kept small. However, a small inductance value causes a problem—weakness against disturbance. The present invention provides an arc welding control method that performs arc welding while repeating the short-circuit period and the arc period. According to the method, changing an inductance value relating to welding output in the arc period offers stable arc welding with fewer spatters and insusceptibility to disturbance.