Orbital Welding Oxygen Sensing via Remote Gas Sampling
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Solution Overview
Problem
Existing orbital welding devices with shielding gas chambers face challenges in measuring oxygen concentrations flexibly and efficiently, particularly in the shielding gas before it is introduced into the chamber or pipe.
Innovation Solution
An orbital welding device with an oxygen sensor integrated into the welding current source housing, allowing for flexible measurement of oxygen concentrations at various locations, including in the shielding gas before it is introduced into the chamber or pipe.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the oxygen sensor is arranged in the shielding gas chamber or at the welding location, then the measurement of oxygen concentration at the welding point is improved, but the flexibility and ease of handling the sensor deteriorates
Solution Approach 1:
The patent introduces a gas sampling system as an intermediary between the shielding gas chamber and the oxygen sensor. A sampling probe extracts gas samples from the chamber and transports them to the sensor located in the welding current source housing. This mediator enables accurate measurement of chamber oxygen levels while keeping the sensor stationary and easy to handle, resolving the contradiction between measurement precision and operational flexibility
Solution Approach 2:
The measurement system is segmented into separate functional components: the sampling probe that contacts the shielding gas chamber, the gas transport mechanism, and the oxygen sensor housed in the welding current source. This segmentation allows the sensor to be positioned optimally for handling while the sampling probe reaches into the chamber, achieving both ease of operation and measurement accuracy
2Ease of operation
If the oxygen sensor is integrated into the welding current source housing, then the ease of operation and flexibility are improved, but the direct measurement capability at the welding location deteriorates
Solution Approach 1:
The gas sampling probe acts as an intermediary that bridges the gap between the welding current source housing (where the sensor is conveniently located) and the shielding gas chamber (where measurement is needed). The probe extends into the chamber to sample gas directly, ensuring measurement precision is maintained despite the sensor's remote location
Solution Approach 2:
The patent replaces the need for physically positioning the sensor at the welding location with a gas sampling and transport mechanism. Instead of mechanically placing the sensor in difficult-to-reach areas, the system uses gas flow to transport samples to the sensor, maintaining measurement accuracy while improving operational flexibility
3Adaptability or versatility
If multiple oxygen sensors are used to measure oxygen at various locations, then the measurement coverage is improved, but the device complexity increases
Solution Approach 1:
The single oxygen sensor in the welding current source housing serves multiple measurement functions by receiving gas samples from different locations through the sampling probe system. The same sensor can measure oxygen in the shielding gas chamber, in the pipe interior, or in the fresh gas supply, providing versatile measurement coverage without requiring multiple sensors
Solution Approach 2:
The patent combines multiple measurement capabilities into a single sensor system. By merging the sampling functions for different locations (chamber, pipe, gas supply) into one integrated system that feeds a single sensor, the device achieves multi-location measurement versatility while minimizing device complexity
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 precise and flexible measurement of oxygen concentrations, improving the quality of the shielding gas and facilitating the detection of errors such as excessive oxygen levels, thereby enhancing the reliability of the welding process.
Implementation Method 1
the use of oxygen sensors, in particular optical oxygen sensors, for orbital welding
Data Source
AI summary
An orbital welding device (1) for welding two pieces of pipe, the orbital welding device (1) having a welding current source (10) in a welding current source housing (11) and an orbital welding head (20), which is separate from the welding current source housing (11) and is connected to the welding current source (10) by a cable (2), the orbital welding head (20) having a chamber (50) for the use of shielding gas (50) and/or the orbital welding device (1) having a purging device (90) for the use of shielding gas, preferably back-up shielding gas or purge gas, the orbital welding device (1) having an oxygen sensor (40), wherein the oxygen sensor (40) is arranged in or on the welding current source housing (11).