Torch Nozzle Gas Flow Sensing for Stable Shielding Gas
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Solution Overview
Problem
Current welding, cutting, and spraying operations face challenges in monitoring and ensuring the stability of shielding gas flow from torch nozzles, which affects the efficiency and quality of these processes.
Innovation Solution
A nozzle gas flow sensor system that includes a sensing element to measure gas flow rates and a controller to evaluate the stability of the gas flow within a defined window of operation, providing feedback for adjustments to maintain stable gas flow.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If shielding gas flow is monitored using traditional methods, then gas flow can be detected, but the stability and precision of the measurement is insufficient for quality welding operations
Solution Approach 1:
The patent replaces traditional mechanical flow measurement methods with a thermal sensing system that uses temperature changes to detect gas flow rate. The sensing element measures temperature variations caused by gas flow, providing more precise measurements without complex mechanical moving parts.
Solution Approach 2:
The patent introduces a thermal intermediary (sensing element) that converts gas flow characteristics into measurable electrical signals. The sensing element acts as a mediator between the gas flow and the measurement system, enabling precise detection through temperature-dependent electrical property changes.
2Reliability
If gas flow stability is not monitored, then the system operates without additional components, but welding quality and process efficiency deteriorate
Solution Approach 1:
The patent implements a feedback mechanism where the sensing element continuously monitors gas flow rate and provides real-time data to the control system. This feedback enables automatic adjustment of gas flow to maintain optimal conditions, significantly improving welding process reliability and consistency.
Solution Approach 2:
The sensing element is designed to be self-heating through resistive heating, eliminating the need for external heating components. The element automatically maintains its operating temperature and performs self-diagnosis through resistance measurements, reducing system complexity while improving reliability.
3Speed
If a sensing element is used to measure gas flow rate, then flow measurement is achieved, but the response time and stability evaluation capability is limited
Solution Approach 1:
The patent employs periodic sampling of the sensing element's electrical properties (resistance, voltage, current) to track gas flow changes over time. By analyzing the temporal pattern of these periodic measurements, the system achieves both fast response to flow changes and precise evaluation of flow stability through statistical analysis of the sampled data.
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
The system effectively monitors and stabilizes the gas flow, enhancing the efficiency and quality of welding, cutting, and spraying operations by providing real-time feedback for adjustments, ensuring optimal operational conditions.
Implementation Method 1
a sensing element to measure a flow rate of the gas
Data Source
AI summary
A nozzle gas flow sensor and a method thereof are provided. The nozzle gas flow sensor includes circuitry configured to receive sensing signals (readings) from a sensing element, each indicative of a flow rate of shielding gas ejected from a nozzle of a torch; analyze the flow rate; and evaluate the stability of the flow rate of the shielding gas with a window of operation. The nozzle gas flow sensor may include an indicator indicative of the evaluation result. The torch may be a welding torch, a cutting torch and/or a spraying (coating) torch.