Short-Arc Wire Position Control for Uniform Welding Heat Input
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Solution Overview
Problem
Existing arc welding processes with short-circuit and arc phases suffer from uneven heat inputs due to varying short-circuit durations, leading to inconsistencies in the welding process, including non-uniformity and difficulties in controlling heat input and droplet formation.
Innovation Solution
A method for arc welding with a consumable wire electrode that adjusts the feed rate and welding current based on the position of the wire electrode relative to the weld pool, using a control device with a microprocessor to manage these parameters, allowing for precise control of the welding process and uniformity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If the wire electrode speed is adjusted depending on the short-circuit signal, then the welding process can be controlled, but uneven short-circuit durations result in varying heat inputs and prevent high degree of uniformity
Solution Approach 1:
The patent implements feedback control by detecting the actual wire electrode position during welding and using this information to adjust the feed rate and welding current in real-time. This closed-loop control system compensates for variations in short-circuit duration by continuously monitoring position and adjusting parameters to maintain uniform heat input and welding process consistency.
Solution Approach 2:
The patent applies dynamic parameter adjustment by changing the feed rate and welding current based on the detected wire electrode position. Instead of using fixed parameters, the system dynamically adapts the welding parameters throughout the welding cycle, particularly during the short-circuit phase, to ensure uniform heat input regardless of variations in short-circuit duration.
2Manufacturing precision
If the feed rate and welding current are changed based on wire electrode position, then targeted control of heat input and uniformity is achieved, but the system complexity increases
Solution Approach 1:
The patent replaces complex mechanical control systems with electronic sensing and control. Instead of using mechanical mechanisms to maintain wire position and control heat input, the system uses electronic position detection and electronic control of feed rate and current, simplifying the overall system while achieving precise control.
Solution Approach 2:
The patent changes the control approach from mechanical parameter setting to electronic parameter adjustment. By detecting wire position and electronically adjusting feed rate and welding current parameters in real-time, the system achieves precise control of heat input and uniformity without requiring complex mechanical control mechanisms.
3Manufacturing precision
If the wire electrode position is controlled to maintain specified distances, then consistent arc lengths and minimal immersion depths are achieved, but the control difficulty increases
Solution Approach 1:
The patent uses feedback control to automatically detect and respond to wire electrode position variations. By continuously monitoring the wire position and using this information to adjust the feed rate, the system maintains consistent arc lengths and minimal immersion depths without requiring manual measurement or complex control procedures.
Solution Approach 2:
The system performs self-adjustment by automatically detecting wire position and correcting feed rate variations without external intervention. The control system serves itself by using its own position detection capability to regulate the welding parameters, eliminating the need for separate measurement and control systems.
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 achieves a high degree of uniformity in the welding process, enabling targeted control of heat input, consistent arc lengths, and minimal immersion depths, thereby improving the quality and consistency of the weld.
Implementation Method 1
a welding arc burns, in particular, between the wire electrode and a workpiece
Implementation Method 2
The short-circuit phase begins, in particular, when a short circuit occurs between the wire electrode and the weld pool
Data Source
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AI summary
The invention relates to a method for arc welding with a consumable wire electrode (152) comprising a plurality of welding cycles (SC), each having a short-circuit phase (SC) and an arc phase (ARC), in which the wire electrode (152) is fed at a variable feed rate (vF(t)) and in which the feed rate (vF(t)) and/or the welding current (I(t)) is changed depending on a value (x(t)) for the current position of the wire electrode (152), in particular when the value (x(t)) for the current position of the wire electrode (152) reaches, exceeds, or falls below a predetermined position (xc, xD). The invention further relates to a control device (114) for a welding apparatus (100) and to a welding apparatus (100) with such a control device (114).