Welding Wire Feeding Control via Short Circuit Detection
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Solution Overview
Problem
In gas shielded MIG welding, operators face inefficiencies and downtime due to the manual process of determining and maintaining the correct 'stick out' length of welding wire, especially when switching between wire spools, which requires guessing and physical access to the welding area.
Innovation Solution
A welding wire feeding apparatus equipped with a short circuit detection circuit that automatically stops wire feeding once a short circuit is detected, allowing for precise control of the wire length extending from the welding gun, thereby eliminating the need for manual adjustments and ensuring consistent wire supply.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual wire feeding is used to achieve proper stick out length, then the operator can adjust wire length, but the process requires operator guessing and multiple adjustments causing downtime
Solution Approach 1:
The patent replaces manual mechanical wire feeding with an automated wire feeding system that uses electrical signals to control wire advancement. The system substitutes operator judgment and manual adjustment with automated detection and control mechanisms, eliminating the need for operator guessing and multiple adjustments.
Solution Approach 2:
The system implements feedback through electrical contact detection between the wire and workpiece. When the wire makes contact (indicating proper stick out length is achieved), the system automatically receives feedback and stops feeding, eliminating the need for manual measurement and adjustment iterations.
2Ease of operation
If operator remotely initiates wire feeding from behind protective barrier, then operator safety is maintained, but the operator cannot visually verify stick out length without accessing the welding area
Solution Approach 1:
The patent replaces visual verification by the operator with an automated electrical detection system. The system uses electrical contact detection to determine when proper stick out length is achieved, eliminating the need for the operator to physically access the welding area for verification while maintaining remote operation capability.
3Quantity of substance
If excessive wire stick out is provided, then wire feeding is sufficient, but the operator must cut excess wire causing material waste and additional time
Solution Approach 1:
The system uses real-time feedback from electrical contact detection to automatically stop wire feeding at the precise moment when proper stick out length is achieved. This eliminates the need to over-feed wire and subsequently cut excess material, preventing both material waste and the additional time required for trimming.
Solution Approach 2:
The system performs self-regulation by automatically detecting when proper wire length is achieved and stopping the feeding process without operator intervention. This self-service capability prevents material waste by eliminating the need for operator judgment and manual trimming of excess wire.
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 solution reduces operator intervention, minimizes downtime, and ensures consistent wire feeding by automatically setting and maintaining the required 'stick out' length, enhancing the efficiency of the welding process.
Implementation Method 1
a short circuit detection circuit coupled to the wire feeding device. When the short circuit detection circuit detects a short circuit in the wire
Data Source
AI summary
An apparatus and method for feeding welding wire, where the apparatus contains a wire feeding device which pays out a wire and a power source which provides a current and voltage to the wire while it is being paid out. The apparatus further includes a detection circuit which detects a short circuit in the wire when the wire makes contact with a work piece or the like, and upon detection of the short circuit the wire feeding device stops feeding the wire so that a desired stick out distance is achieved.