Movable Arc Welding Gap Control for Dissimilar Workpieces
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Solution Overview
Problem
Existing welding devices are limited in their ability to effectively weld workpieces with different melting behaviors, materials, and wall thicknesses, often requiring post-annealing processes and struggling with uneven heating and gravitational influences on the melt.
Innovation Solution
A welding technique that allows for controlled adjustment of the axial distance between workpieces during heating, enabling targeted influence of the heating and melting process, and coordinated control of welding current and arc movement to manage droplet formation and melting behavior, particularly useful for vertical or inclined orientations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the axial distance between workpieces is kept constant during heating, then the welding process is simpler to control, but the heating uniformity deteriorates and droplet formation cannot be prevented
Solution Approach 1:
The patent applies dynamics by making the axial distance between workpieces variable rather than fixed. The distance is dynamically adjusted during the heating process based on real-time monitoring of heating uniformity and droplet formation, allowing the system to adapt to changing thermal conditions and material behavior.
Solution Approach 2:
The patent implements feedback control by monitoring the heating process and using this information to adjust the axial distance between workpieces. Sensors detect temperature distribution and droplet formation, and this feedback is used to modulate the gap distance to maintain optimal heating conditions.
2Manufacturing precision
If the axial distance between workpieces is varied during heating, then the heating uniformity and droplet control improve, but the device complexity increases
Solution Approach 1:
The patent uses an intermediary control system that coordinates the relationship between heating parameters and axial distance. This intermediary layer processes sensor data and translates it into appropriate distance adjustments, simplifying the overall control architecture while achieving precise heating uniformity.
3Device complexity
If workpieces are welded in horizontal orientation, then the equipment design is simpler, but gravitational influence on molten metal causes uneven distribution
Solution Approach 1:
The patent applies dynamics by enabling the workpiece orientation to be variable rather than fixed in horizontal position. The system can dynamically adjust the orientation angle to optimize molten metal distribution while maintaining reasonable equipment complexity through modular design.
4Ease of operation
If fixed current and gap settings are used, then the welding process is easier to operate, but only uniform workpieces with identical melting behavior can be welded
Solution Approach 1:
The patent makes both the welding current and gap distance dynamic parameters that can be adjusted in real-time based on workpiece characteristics. This allows the system to adapt to different materials, wall thicknesses, and geometries while maintaining ease of operation through automated control.
Solution Approach 2:
The patent implements parameter changes by varying the welding current and gap distance according to the specific workpiece being welded. The system automatically adjusts these parameters based on detected workpiece properties, enabling versatile welding of dissimilar materials and geometries.
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
Enables reliable and high-quality welding of dissimilar workpieces, reducing the need for post-annealing and improving evenness of heating, thus enhancing the versatility and cost-effectiveness of the welding process.
Implementation Method 1
the arc is ignited, which then heats and melts the end faces of the workpieces
Implementation Method 2
a magnetically moved arc
Data Source
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AI summary
The invention relates to a welding device (1) for welding workpieces (3, 4) having a movable arc (8), wherein the welding device (1) comprises a controlled welding current source (25) having a current controller (27) and a positioning and compressing device (15) for the workpieces (3, 4), said device holding the workpieces (3, 4) at a distance (s) during heating and then compressing them. The welding device (1) comprises a device (28) for determining and analyzing process parameters, particularly the arc voltage, and a device for correspondingly controlling and changing (?s) the distance (s) between the workpieces (3, 4) during heating. The welding device (1) can further comprise a driving device (21) for moving the arc (8), designed as a controllable magnet device having one or more inner and/or outer coils (22, 23) for electromagnetically moving the arc (S). The invention further relates to a method for welding workpieces (3, 4) having a movable arc (8), wherein the workpieces (3, 4) have a controlled welding current applied thereto by welding device (1) having a controlled welding current source (25), and are held at a distance (s) during warming and then compressed by a positioning and compressing device (15). Using the device (28), the arc voltage particularly can be determined and analyzed, wherein the distance (s) between the workpieces (3, 4) is correspondingly controlled and changed (?s) by a device (16) during warming. Depending on the process parameter or parameters determined, the welding current and/or the distance (s) can be controlled during heating. Electrically conductive, particularly metal, workpieces (3, 4) made of different, particularly differently melting, materials can be welded.