External Pulse Generator for Retrofitting Constant-Current Welders
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Solution Overview
Problem
Existing constant-current welding machines lack the pulsing functionality, which is typically only available in more expensive machines, limiting the ability to achieve pulsed welding operations.
Innovation Solution
An external assembly is placed in series between the input pedal and the welder, modifying the low power signal to generate a pulsed waveform, allowing for pulsing functionality to be added to constant-current welding machines, including settings for wave type, frequency, duty cycle, and amperage, and featuring a controller with a microcontroller and op-amp circuit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If an external pulse generator is added to a continuous welding machine, then pulsing functionality is achieved, but device complexity increases
Solution Approach 1:
An external pulse generator device is introduced as an intermediary component between the foot pedal and the welding machine. This external device receives the continuous signal from the foot pedal, processes it through a microcontroller and op-amp circuitry to generate pulsed waveforms, and then outputs the modified pulsed signal to control the welding machine, thereby adding pulsing functionality without modifying the welding machine itself
Solution Approach 2:
The pulsing functionality is separated from the main welding machine system and implemented as an independent external device. This segmentation allows the continuous welding machine to remain simple while the external pulse generator handles all pulse generation complexities through its own microcontroller, signal processing circuits, and waveform generation capabilities
2Adaptability or versatility
If built-in pulsing features are included in the welder, then pulsing functionality is achieved, but cost increases
Solution Approach 1:
Instead of incorporating expensive built-in pulsing circuitry into the welding machine, an external pulse generator serves as a cost-effective intermediary that provides the same functionality. This external device uses affordable components including a microcontroller, op-amp circuits, and basic signal processing elements to generate pulsed waveforms, avoiding the need for expensive integrated pulsing features in the main welder
Solution Approach 2:
The external pulse generator replicates the pulsing functionality of expensive built-in systems using separate, more economical hardware. Rather than paying for integrated pulsing capabilities in the welding machine, the user purchases a standalone external device that copies the essential pulse generation function using cost-effective discrete components and circuitry
3Device complexity
If continuous current is used for welding, then simplicity is maintained, but heat-induced warping increases
Solution Approach 1:
The external pulse generator transforms the continuous current output from the welding machine into a periodic pulsed waveform. The microcontroller generates timed pulse signals that switch the welding current on and off in controlled cycles, creating periods of high current followed by periods of reduced or zero current, allowing the workpiece to cool between pulses and minimizing cumulative heat buildup that causes warping
Solution Approach 2:
The pulse generator dynamically changes the current delivery parameters by varying pulse width, frequency, and duty cycle through microcontroller control. This allows the welding process to deliver high peak currents for penetration when needed, followed by lower average currents for cooling, effectively controlling heat input and minimizing thermal distortion while maintaining welding quality
Data Source
AI summary
The present invention provides a unique and novel, low-cost external assembly that can be used to add a pulsed current functionality to a continuous welding machine. The external assembly is located in series between a pedal for controlling the welder and the welder itself. The external assembly includes a controller that modifies the pedal input signal typically entering directly into the welder. The modified signal converts the continuous welding machine such that it operates as a pulsed welding machine.