Pulse Arc Welding Current Adjustment for Tip-Base Distance
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Solution Overview
Problem
Conventional pulse arc welding methods face instability due to variations in shielding gas mixture ratios and changes in the tip-base distance, leading to fluctuations in arc conditions, which affect welding quality and result in undercuts and spatters.
Innovation Solution
A pulse arc welding method that adjusts the welding current by incorporating a first and second peak current, with the first peak current increased when the tip-base distance is shorter than the reference value and the second peak current reduced when it is longer, to maintain a stable arc condition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the tip-base distance is shorter than the reference value, then the welding speed increases, but the arc stability deteriorates and undercuts occur
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the peak current value based on the actual tip-base distance. When the distance is shorter than the reference value, the peak current is increased to compensate for the reduced arc length, thereby maintaining arc stability and preventing undercuts while allowing shorter tip-base distances for higher welding speed.
2Reliability
If the tip-base distance is longer than the reference value, then the arc stability improves, but the welding speed decreases and spatters increase
Solution Approach 1:
The patent applies parameter changes by dynamically adjusting the peak current value based on the actual tip-base distance. When the distance is longer than the reference value, the peak current is decreased to prevent excessive heat input that causes spatters, while maintaining sufficient arc stability for reliable welding at longer distances.
3Adaptability or versatility
If the shielding gas mixture ratio varies, then the availability of gas sources increases, but the arc condition becomes unstable
Solution Approach 1:
The patent applies parameter changes by adjusting the peak current value in response to shielding gas mixture ratio variations. When the gas mixture ratio deviates from the standard, the peak current is modified to compensate for the resulting arc condition changes, thereby maintaining arc stability and welding quality despite using different gas compositions.
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 ensures a stable arc and high-quality welding by maintaining the arc anode point at the upper portion of the droplet, preventing undercuts and spatters, even with fluctuations in shielding gas ratios and tip-base distances.
Implementation Method 1
causing welding current to flow through a welding wire and a base metal via a power supply tip so that an arc is ignited between the welding wire and the base metal
Data Source
AI summary
A pulse arc welding method is provided for performing welding by causing welding current to flow through a welding wire and a base metal via a power supply tip. The welding current has a pulse cycle made up of a first peak time, a second peak time and a base time. A first peak current is applied during the first peak time, a second peak current, smaller than the first peak current, is applied during the second peak time, and a base current is applied during the base time. When a tip-base distance between an end of the power supply tip and the base metal is smaller or greater than a reference value, the first peak current is increased or decreased in accordance with the difference between the reference value and the tip-base distance.