Multiple Pulse Welding Control for Stable Wire Feed Synchronization
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Solution Overview
Problem
In multiple pulse welding processes, especially in tandem pulse welding, achieving ideal welding conditions is challenging due to the complexity of synchronizing pulse frequencies and wire feed speeds between multiple welding processes, which can lead to unstable welding processes and poor weld quality.
Innovation Solution
The method involves synchronizing pulse frequencies between welding processes using a predetermined integer ratio, allowing for adjustments in welding parameters to maintain optimal droplet detachment and arc length, ensuring consistent welding quality by regulating the root mean square value of the welding current.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple pulse welding processes are operated independently with separate welding machines, then each welding process can be set with separate parameters, but the complexity of parameter setting increases and control over mutual interference is reduced
Solution Approach 1:
The patent combines multiple pulse welding processes into a single welding machine with a unified control unit. This integration allows the control unit to centrally manage and coordinate multiple welding processes, eliminating the need for separate parameter setting for each process while maintaining the ability to adapt to different welding requirements through software configuration.
Solution Approach 2:
The welding machine is designed with multi-functionality to perform multiple pulse welding processes simultaneously using a single device. The control unit can manage different welding processes with different parameters within one machine, reducing the overall complexity compared to using multiple separate welding machines.
2Productivity
If pulse frequency is increased to increase welding performance, then welding speed improves, but wire feed rate must be increased proportionally which may prevent stable welding process
Solution Approach 1:
The control unit dynamically adjusts the wire feed rate based on the selected pulse frequency and the specific welding process configuration. This dynamic adjustment ensures that the wire feed rate is optimally matched to each pulse frequency, maintaining welding process stability even at higher frequencies that increase productivity.
Solution Approach 2:
The system incorporates feedback mechanisms where the control unit monitors welding parameters and adjusts wire feed rate in response to detected conditions. This feedback loop ensures that stability is maintained by correcting deviations that occur when pulse frequency changes affect the welding process.
3Manufacturing precision
If wire feed rate is decreased to improve welding quality, then droplet detachment is improved, but pulse frequency must be decreased which reduces welding productivity
Solution Approach 1:
The control unit applies different wire feed rates and pulse frequency settings to different welding processes or different stages of the welding process based on local requirements. This allows optimization of weld quality in critical areas while maintaining higher productivity in less critical areas, resolving the contradiction between quality and output.
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 that welding processes can be maintained with ideal settings, reducing the risk of weld defects and improving the overall quality by synchronizing pulse frequencies and wire feed speeds, thus enhancing the stability and consistency of the welding process.
Implementation Method 1
a base welding current and a higher pulse welding current alternate regularly at a predetermined pulse frequency. During the base welding current phase, the arc burns at low power to keep the weld pool molten. During the pulse current phase, a droplet of the filler material, supplied as welding wire, forms and is ultimately detached and falls into the weld pool.
Implementation Method 2
Pulse welding with a consumable electrode and pulsed arc
Data Source
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AI summary
The aim of the invention is to be able to operate the pulsed welding processes involved in a multiple pulsed-welding method with welding settings that are as ideal as possible. This aim is achieved in that an ideal ratio (Vopt) between the root-mean-square value (RMSopt) of the welding current (ISb) and the welding-wire advancing velocity (VDb) is determined from a known relationship between the pulse frequency (fD b) and the welding-wire advancing velocity (VDb), an actual root-mean-square value (RMSnopt) of the welding current (ISb) is determined by means of the welding current (ISb) with the pulse frequency (fDb) to be set, and at least one pulsed current parameter of the welding current (ISb) of the pulsed welding process and/or the welding-wire advancing velocity (VDb) of the pulsed welding process is changed in order to change the actual ratio (V) to the ideal ratio (Vopt).