Arc Welding Wire Control for Stable Starts and Low Deformation
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Solution Overview
Problem
Conventional arc welding methods face issues with unstable arc starts, leading to deformation of the welding wire, which can cause failures, and require longer cycle times to mitigate this instability.
Innovation Solution
The method involves controlling the welding wire feeding speed and protrusion length during the start, main, and end periods to stabilize the arc start, with shorter protrusion lengths during the start period and longer lengths during the main period, allowing for stable arc formation without increasing cycle time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the welding torch moving speed is decreased to ensure stable arc start, then arc start stability is improved, but welding cycle time increases
Solution Approach 1:
The welding wire protrusion length is preliminarily adjusted to a shorter length before arc initiation. This preliminary adjustment ensures that when the wire contacts the workpiece, the electrical resistance is optimized for immediate arc generation, eliminating the need to slow down the welding torch and thus reducing cycle time while maintaining arc start stability
Solution Approach 2:
The protrusion length of the welding wire is changed as a control parameter. By setting the protrusion length to a specific shorter range (30% to 80% of the normal welding protrusion length) at the start of welding, the electrical resistance at the contact point is optimized, enabling reliable arc initiation without requiring reduced welding torch speed
2Quantity of substance
If the welding wire protrusion length is increased to ensure sufficient welding amount, then welding amount is improved, but wire deformation increases
Solution Approach 1:
The welding wire protrusion length is made dynamic rather than static. The system automatically adjusts the protrusion length based on the welding phase: shorter protrusion (30% to 80% of normal length) during arc start to prevent deformation, and returns to normal protrusion length during main welding to ensure sufficient welding amount
Solution Approach 2:
The protrusion length is preliminarily set to a shorter value specifically for the arc start phase. This preliminary setting prevents wire deformation during the critical moment of contact and arc initiation, while the system subsequently restores normal protrusion length for the welding process
3Manufacturing precision
If the welding wire protrusion length is decreased to reduce wire deformation, then wire deformation is reduced, but welding amount decreases
Solution Approach 1:
The welding process is segmented into distinct phases with different protrusion length requirements: arc start phase with shorter protrusion length (30% to 80% of normal) to minimize deformation, and main welding phase with normal protrusion length to ensure sufficient welding amount. The system transitions between these phases automatically
4Reliability
If the welding torch moving speed is decreased to prevent arc start failure, then arc start reliability is improved, but productivity decreases
Solution Approach 1:
The protrusion length parameter is changed specifically for arc start conditions. By controlling the protrusion length to be shorter (30% to 80% of normal welding protrusion length) only during the approach and contact phase, the system achieves reliable arc start without affecting the welding torch moving speed, thus maintaining high productivity
Solution Approach 2:
The protrusion length is preliminarily adjusted to an optimal value for arc initiation before the welding torch contacts the workpiece. This preliminary optimization ensures reliable arc start at normal welding speeds, eliminating the need to reduce speed and thereby maintaining 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 approach ensures stable arc starts, reduces wire deformation, and maintains sufficient welding amount, even with materials like mild steel or higher resistance materials, while minimizing issues like touch starts and reducing overall welding time.
Implementation Method 1
generating an arc between the welding wire and the welding target
Implementation Method 2
the welding wire may be deformed, causing a failure at the arc start
Data Source
AI summary
A welding period from start of welding to end of welding includes a start period and a main welding period. In the start period, a welding wire is fed at a predetermined feeding speed. In the main welding period, the welding wire is fed at a higher feeding speed than the feeding speed in the start period. The protrusion length of the welding wire at the start of welding in the start period is shorter than the protrusion length of the welding wire in the main welding period.