Adaptive Submerged Arc Welding with AC Balance and Offset Control
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Solution Overview
Problem
Conventional submerged arc welding (SAW) processes face challenges in maintaining optimal penetration depth and deposition rate while avoiding hot cracks, which limits productivity due to the need for maintaining safety margins in operating parameters, thereby affecting the mechanical properties of the weld.
Innovation Solution
An adaptive SAW system that monitors the welding process in real-time to determine discrepancies between desired and actual weld parameters, and adjusts the balance and offset of the AC welding power signal to compensate for these discrepancies, allowing for real-time modification of deposition rates and penetration without altering the heat input, thus maintaining mechanical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If operating parameters are maintained at low levels to avoid hot cracks, then reliability is improved, but penetration depth and deposition rate decrease, reducing productivity
Solution Approach 1:
The patent applies dynamics by transitioning from static, conservative parameter settings to dynamic, real-time parameter adjustment. The adaptive control system continuously monitors weld pool conditions and adjusts operating parameters (current, voltage, wire feed speed) dynamically, allowing the system to operate at optimal levels rather than fixed conservative levels, thereby resolving the contradiction between reliability and productivity
Solution Approach 2:
The patent implements feedback through real-time monitoring of weld pool characteristics (temperature, geometry, fluid flow) and using this information to adjust operating parameters. This closed-loop control enables the system to maintain reliability by detecting potential crack conditions and simultaneously maximize productivity by operating at optimal parameter levels, directly resolving the technical contradiction
2Productivity
If operating parameters are increased to improve penetration depth and deposition rate, then productivity is improved, but the risk of hot cracks increases, reducing reliability
Solution Approach 1:
The system uses dynamic parameter adjustment to allow high productivity operation when conditions permit while automatically reducing parameters when crack risk is detected. This temporal variability in operating parameters enables the system to achieve high average productivity without compromising reliability, as the system adapts to real-time conditions
Solution Approach 2:
Real-time feedback from weld pool monitoring enables the system to detect early signs of potential hot cracks and immediately adjust parameters to prevent them, while allowing aggressive parameter settings when conditions are favorable for high productivity. This feedback mechanism resolves the contradiction by making reliability contingent on real-time conditions rather than conservative defaults
3Manufacturing precision
If active parameters (current, voltage, travel speed) are changed to maintain desired fill, then manufacturing precision is improved, but heat input changes, affecting mechanical properties of the heat affected zone
Solution Approach 1:
The patent applies parameter changes by introducing new control variables (balance and offset of AC power signal) that allow independent adjustment of deposition characteristics without proportionally changing heat input. This expands the control space beyond traditional active parameters, enabling precision fill maintenance while preserving mechanical properties through selective parameter modification
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 enables increased deposition rates and penetration depths while maintaining consistent mechanical properties, enhancing productivity by allowing for more efficient welding processes without the need for excessive safety margins.
Implementation Method 1
a power supply to supply alternating current (AC) welding power signal to the welding wire to create a molten weld pool on the workpiece
Data Source
AI summary
A method includes monitoring a submerged arc welding (SAW) operation in real-time; determining, based on the monitoring and in real-time, a discrepancy between a desired weld parameter and an actual weld parameter of a weld resulting from the SAW operation; and in response to determining the discrepancy, controlling a power supply, which provides power for the SAW operation, to modify at least one of balance or offset of an alternating current (AC) welding power signal supplied for the SAW operation to compensate for the discrepancy.