Arc Welding Current and Wire Feed Control for Stable Penetration
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Solution Overview
Problem
Existing arc welding methods face challenges in achieving stable penetration depth and reducing spatter, particularly when using high current densities, as they often result in increased spatter and decreased workability due to the application of high potential gradient shielding gases or currents.
Innovation Solution
A welding control method that periodically switches the welding wire's feeding between forward and reverse directions, controlling the welding current to maintain a specific ratio between non-suppression and suppression periods, with a frequency of 50 to 150 Hz, and adjusting the current and feeding periods to ensure a stable arc length and optimal droplet release.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high welding current or high potential gradient shielding gas is applied to increase thermal energy and ensure penetration depth, then penetration depth is improved, but spatter increases and welding workability decreases
Solution Approach 1:
The patent applies periodic forward and reverse feeding of the welding wire at frequencies of 50 to 150 Hz. This periodic action creates controlled variations in arc length and current density, allowing the arc to penetrate deeply into the workpiece during forward feeding while the reverse feeding prevents excessive spatter generation by resetting the arc length. This resolves the contradiction by achieving deep penetration without the continuous high current density that causes spatter.
Solution Approach 2:
The patent dynamically adjusts the wire feeding direction and speed, switching between forward feeding (toward the workpiece) and reverse feeding (away from the workpiece). This dynamic control allows the system to optimize penetration depth during forward feeding phases while preventing spatter during reverse feeding phases, thereby resolving the contradiction between deep penetration and spatter reduction.
2Manufacturing precision
If high welding current is used to increase thermal energy, then penetration depth is improved, but spatter increases and welding workability decreases
Solution Approach 1:
By implementing periodic forward and reverse feeding at 50-150 Hz, the patent creates a rhythm of high current application followed by current reduction. During forward feeding, high current ensures deep penetration; during reverse feeding, current is reduced which minimizes spatter and improves workability. This periodic modulation resolves the contradiction between penetration depth and welding workability.
3Object-generated harmful factors
If forward feeding and reverse feeding are periodically switched to reduce spatter, then spatter is reduced, but stable penetration depth cannot be ensured due to short circuit or droplet release deviation
Solution Approach 1:
The patent optimizes specific parameters including frequency (50-150 Hz), wave height (14-35% of arc length), and duty cycle (forward feeding 40-70%, reverse feeding 30-60%). These parameter changes ensure that the periodic feeding switches occur at rates and amplitudes that prevent short circuits while maintaining stable droplet release, thereby achieving both spatter reduction and stable penetration depth.
Solution Approach 2:
The patent incorporates feedback mechanisms to detect and correct deviations in droplet release timing and arc stability. By monitoring the welding process in real-time and adjusting the feeding parameters accordingly, the system maintains stable penetration depth even during periodic forward and reverse feeding operations, resolving the contradiction between spatter reduction and penetration stability.
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 simultaneously achieves stable penetration depth and reduces spatter by optimizing the welding current and wire feeding patterns, enhancing the overall efficiency and quality of the welding process.
Implementation Method 1
a welding current is supplied to a welding wire... the feeding of the welding wire periodically and repeatedly switches between forward feeding and reverse feeding
Implementation Method 2
thermal energy of arc... increasing the current density of arc
Data Source
AI summary
A relationship between an average current (IP-AVE) of a current non-suppression period (TIP) and an average current (IB-AVE) of a current suppression period (TIB) is set as 0.65≤IP-AVE/(IP-AVE+IB-AVE)≤0.90, a relationship between any current non-suppression period (TIP) and the current suppression period (TIB) immediately after is set as 0.30≤TIB/(TIP+TIB)≤0.60, a relationship between a forward feeding period (TP) and a reverse feeding period (TN) is set as 0.40≤TN/(TP+TN)≤0.70, a relationship between the current non-suppression period (TIP), the current suppression period (TIB), the forward feeding period (TP), and the reverse feeding period (TN) is set as {TN/(TP+TN)}>{TIB/(TIP+TIB)}, and the current non-suppression period (TIP) is controlled to account for ⅔ or more of the forward feeding period (TP).