Robot TIG Tungsten Electrode Replacement for Continuous Welding
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Solution Overview
Problem
Manual replacement of tungsten electrodes in robot welding systems for tube-to-tubesheet welding in nuclear power plants lowers automation levels and affects welding efficiency.
Innovation Solution
An apparatus and method for automatically replacing a tungsten electrode using a gas hood mounting/removing clamp, transverse and longitudinal positioning carriages, and tungsten electrode seats to facilitate automated replacement in a robot welding system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Extent of automation
If manual replacement of tungsten electrodes is used, then operation simplicity is maintained, but automation level and welding efficiency deteriorate
Solution Approach 1:
The apparatus is divided into multiple independent functional modules: a first carriage for holding burnt-off electrodes, a second carriage for holding new electrodes, a clamp for gripping electrodes, and a robot arm for positioning. Each module operates independently but coordinates through the control system, enabling automated replacement while maintaining manageable complexity through modular design.
Solution Approach 2:
The system enables self-service automation where the robot arm automatically positions the welding gun, the clamp automatically grips and releases electrodes, and the carriages automatically present new electrodes without human intervention. The control system coordinates these actions to create a self-sufficient automated replacement process.
2Productivity
If manual replacement of tungsten electrodes is used, then device complexity is reduced, but welding efficiency deteriorates
Solution Approach 1:
New tungsten electrodes are pre-loaded onto the second carriage before the welding process begins. When electrode replacement is needed, the system simply exchanges pre-prepared electrodes rather than requiring preparation during the welding process. This preliminary preparation eliminates downtime and maintains high welding efficiency.
Solution Approach 2:
The automated electrode replacement system enables continuous welding operations by eliminating manual intervention delays. The robot arm and clamp coordinate to replace electrodes during predetermined pause points in the welding process, ensuring that the welding gun remains productive with minimal interruption to the overall welding cycle.
3Productivity
If automated electrode replacement is implemented, then welding efficiency is enhanced, but system complexity increases
Solution Approach 1:
The clamp is designed with universal gripping capability that can accommodate different sizes and types of tungsten electrodes through adjustable fingers. The carriages can hold multiple electrodes of various specifications, and the robot arm can position the welding gun at different locations. This multi-functionality reduces the need for multiple specialized devices, managing overall system complexity.
Solution Approach 2:
The control system acts as an intermediary that coordinates between the robot arm, clamp, and carriages. Rather than requiring complex mechanical linkages between all components, the control system mediates their interactions through programmed sequences, simplifying the physical system architecture while maintaining coordinated automated operation.
Data Source
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AI summary
Disclosed are an apparatus for automatically replacing a tungsten electrode for tungsten inert gas welding of a robot welding system and a corresponding method, wherein a gas hood mounting/ removing clamp (20) removes a gas hood from a welding gun (10) with a burnt-off tungsten electrode; a first tungsten electrode seat (41) is moved, along with a first carriage, to a position corresponding to a tungsten electrode mounting/removing clamp (60) or the welding gun (10); the tungsten electrode mounting/removing clamp (60) removes the burnt-off tungsten electrode on the welding gun (10) and rests it on the first tungsten electrode seat (41); a second tungsten electrode seat (42) is moved, along with a second carriage, to the position corresponding to the tungsten electrode mounting/removing clamp (60) or the welding gun (10); the tungsten electrode mounting/removing clamp (60) snaps a new tungsten electrode from the second tungsten electrode seat (42) and mounts it to the welding gun (10); the gas hood mounting/removing clamp (20) mounts the gas hood to the welding gun with the new tungsten electrode. The present disclosure enables automatic replacement of the tungsten electrode, which guarantees weld seam quality of robot welding, improves the automation level of the system, and enhances welding efficiency.