Arc Welding Current Timing for Stable Arcs and Less Spatter
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Solution Overview
Problem
In consumable electrode type arc welding, spatter generation is challenging to control due to unpredictable short circuits, leading to unstable arcs and increased spatter formation, as the timing of switching welding current to a small current value is difficult to optimize.
Innovation Solution
An arc welding control method that alternately switches the welding wire's feeding rate between forward- and reverse-feeding periods, optimizing the timing of switching the welding current to a small current value in the latter half of the arc period by setting an average feeding rate and adjusting based on voltage setting values and error amplification, ensuring stable arc maintenance and reduced spatter generation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If the welding current is switched to a small current value after a predetermined time has elapsed from the reoccurrence of the arc, then the arc state becomes stable, but the welding current value at the time of short circuit occurrence cannot be reduced and spatters occur
Solution Approach 1:
The patent applies dynamics by making the current drop timing adjustable and adaptive rather than fixed. The control system dynamically adjusts the timing of current reduction based on detected arc state parameters (voltage, current, or feeding rate), allowing the system to optimize the balance between arc stability and spatter prevention for different welding conditions.
Solution Approach 2:
The patent implements feedback control by detecting arc state parameters (voltage, current, or feeding rate) and using this information to adjust the timing of welding current reduction. The control system continuously monitors the arc state and adjusts the current drop timing accordingly, creating a closed-loop control system that adapts to changing welding conditions to minimize spatter while maintaining arc stability.
2Object-generated harmful factors
If the welding current is switched to a small current value immediately before short circuit occurs, then spatter generation is reduced, but the timing is difficult to predict and optimize
Solution Approach 1:
The patent uses feedback control to automatically determine the optimal timing for current reduction based on real-time detection of arc state parameters. By monitoring voltage, current, or feeding rate changes, the system automatically adjusts the timing without requiring manual optimization, reducing control complexity while achieving effective spatter prevention.
Solution Approach 2:
The patent applies parameter changes by using detectable changes in arc state parameters (voltage, current, or feeding rate) as indicators to trigger current reduction. Instead of using fixed time delays, the system monitors parameter changes and adjusts timing based on the actual arc state, making the control system adaptable to different welding conditions without increasing complexity.
3Stability of the object's composition
If forward and reverse feeding control is applied, then the repetition cycle of short circuit and arc is stabilized and welding quality is improved, but spatter generated at short circuit occurrence remains challenging to control
Solution Approach 1:
The patent combines forward-reverse feeding control with adaptive current reduction control into a unified system. By merging these two control mechanisms and coordinating their operation through feedback from arc state detection, the system achieves both stable repetition cycles and effective spatter prevention at short circuit occurrence.
Solution Approach 2:
The patent implements feedback control that monitors arc state parameters and adjusts both the feeding rate and welding current timing coordinate. This integrated feedback system ensures that current reduction occurs at the optimal moment relative to the feeding cycle, simultaneously stabilizing the repetition cycle and preventing spatter generation.
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 method effectively reduces spatter generation by optimizing the timing of switching the welding current, maintaining a stable arc state and improving welding quality by minimizing spatter occurrence.
Implementation Method 1
generating an arc between the welding wire and a base metal
Data Source
AI summary
The purpose of the present invention is to reduce the amount of sputtering in a welding method wherein a welding wire feed rate is alternately switched between a forward feed period and a reverse feed period. Provided is an arc welding control method that switches a feed rate Fw for welding wire alternately between a forward feed period and a reverse feed period, repeats a short period and an arc period, and electrifies with a welding current Iw switched to a small current value in the latter half of the arc period, wherein a basic voltage setting value is set according to an average feed rate setting value, the error amplitude value for a voltage setting value and the basic voltage setting value is calculated, and the timing (current reduction time Td) for switching the welding current Iw to the small current value is varied on the basis of the average feed rate setting value and the error amplitude value.