Welding Control Unit Stabilizes Bead Shape via Contact Detection
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Solution Overview
Problem
Conventional automatic welding equipment lacks a means to detect the tip position of the filler wire during starting welding, leading to variable weld bead shapes and potential defects due to unsynchronized arcing and material feeding.
Innovation Solution
The equipment includes a material contact detector to detect the timing of contact release between the welding material and workpiece, allowing the power controller to increase power from starting arc to main welding power, stabilizing the weld bead shape, and reduces component count by sharing power sources and integrating detectors within the welding control unit.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If conventional automatic welding equipment is used without tip position detection, then equipment complexity is reduced, but manufacturing precision of weld bead shape deteriorates
Solution Approach 1:
The patent replaces complex mechanical tip position detection systems with an electrical detection method. By measuring voltage changes between the filler wire and workpiece, the system determines tip position and contact timing without mechanical sensors, thereby maintaining manufacturing precision while reducing device complexity.
Solution Approach 2:
The welding system uses its own electrical parameters (voltage between filler wire and workpiece) to detect tip position and contact timing. This self-service approach eliminates the need for separate detection devices, reducing system complexity while maintaining precise control over weld bead formation.
2Device complexity
If filler wire tip position is not detected during starting welding, then device complexity is reduced, but reliability of welding quality deteriorates
Solution Approach 1:
The patent implements a feedback mechanism where the voltage signal between filler wire and workpiece is continuously monitored during starting welding. This feedback provides real-time information about tip position and contact timing, enabling the system to adjust power supply and material feeding to ensure consistent weld quality without adding complex detection hardware.
3Productivity
If arc power is increased immediately during starting welding, then productivity is improved, but manufacturing precision of weld bead shape deteriorates
Solution Approach 1:
The patent applies preliminary action by detecting filler wire contact timing with the workpiece before full welding power is applied. Based on this detection, the system pre-adjusts power supply levels and material feeding rates to ensure proper weld bead formation from the start, preventing defects that would require rework and thus maintaining both productivity and precision.
Solution Approach 2:
The system dynamically adjusts arc power and material feeding based on real-time detection of filler wire position and contact timing. During starting welding, power is gradually increased rather than applied immediately at full level, allowing the weld bead to form correctly before high-speed welding begins, thereby maintaining both precision and productivity.
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 configuration stabilizes the weld bead shape in starting welding, reduces equipment costs, and eliminates the need for additional space and noise-suppression measures, enhancing welding productivity and quality.
Implementation Method 1
welding power source 302 that applies welding voltage between tungsten electrode 301, which is a non-consumable electrode, and workpiece 305 to produce welding arc 308
Implementation Method 2
a material voltage or current detector for detecting voltage or current between the welding material and the welding workpiece
Data Source
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AI summary
A welding control unit has a common power section for detecting contact of a welding material and for welding. A material contact detector for detecting contact of the welding material and a workpiece, and a power controller are built in the welding control unit. This stabilizes a bead shape in starting welding. The number of components can also be reduced, resulting in more inexpensive equipment. In addition, only a space for installing the welding control unit is needed without any additional space.