Arc Additive Manufacturing With Interpass Temperature Control
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Solution Overview
Problem
In additive manufacturing using an arc, the high heat input leads to low cooling rates and unstable deposition, causing issues like flattening or running of weld beads, while increasing deposition time to improve stability reduces productivity.
Innovation Solution
Monitoring the temperature of molten beads and starting deposition of the next layer only when the previous layer has cooled to an allowable interpass temperature, adjusting deposition time and number of welding torches to ensure efficient and stable layer formation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the deposition time per layer is prolonged to allow cooling of the previous layer, then the deposition stability is improved, but the productivity is reduced
Solution Approach 1:
The patent employs temperature monitoring of the previously deposited layer to provide feedback on the cooling state. This feedback mechanism enables dynamic adjustment of the deposition timing, allowing the system to proceed as soon as the temperature reaches the predetermined threshold, thereby optimizing both deposition stability and productivity without requiring prolonged waiting times.
Solution Approach 2:
The patent transforms the static, fixed deposition interval into a dynamic process based on real-time temperature conditions. By making the deposition timing dependent on the actual cooling state of the previous layer rather than a predetermined fixed time, the system adapts to varying thermal conditions, ensuring stable deposition while minimizing idle time and maximizing productivity.
2Productivity
If the deposition time per layer is shortened to enhance productivity, then the productivity is improved, but the deposition stability deteriorates
Solution Approach 1:
The temperature monitoring system provides real-time feedback on the cooling state of the previous layer, enabling the system to determine the precise moment when deposition can safely commence. This feedback mechanism ensures that productivity is maximized by eliminating unnecessary waiting time while maintaining deposition stability through scientifically determined timing based on actual thermal conditions.
Solution Approach 2:
The patent changes the critical parameter of deposition timing from a fixed value to a temperature-dependent variable. By establishing a predetermined temperature threshold as the trigger for starting the next layer deposition, the system optimizes the balance between productivity and stability, allowing faster deposition cycles while ensuring the previous layer has cooled sufficiently to prevent defects.
3Productivity
If the heat input amount is increased to maintain deposition speed, then the deposition efficiency is maintained, but the cooling rate decreases causing bead flattening or running
Solution Approach 1:
The patent implements preliminary temperature monitoring and cooling time determination before initiating each new layer deposition. By assessing the thermal state of the previous layer in advance and establishing a temperature threshold that ensures adequate cooling, the system prevents bead flattening and running defects while maintaining efficient deposition parameters, thus preserving both productivity and manufacturing precision.
Solution Approach 2:
The patent replaces mechanical control methods (such as fixed deposition intervals or manual timing) with a temperature-based control system. By using temperature monitoring and threshold-based triggering, the system automatically determines the optimal timing for each deposition layer, eliminating the need for conservative fixed time intervals and enabling precise control of bead shape while maintaining deposition efficiency.
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 enables stable and precise additive manufacturing while maintaining high deposition efficiency by controlling the cooling time and heat input, preventing bead flattening or running and enhancing productivity.
Implementation Method 1
melting and solidifying a filler metal by use of an arc
Implementation Method 2
melting and solidifying a filler metal by use of an arc, and depositing and forming a plurality of layers of molten beads
Implementation Method 3
monitoring a temperature of the molten bead of the previous layer
Implementation Method 4
measuring a cooling time until the temperature of the molten bead of the previous layer is cooled down to the allowable interpass temperature
Data Source
AI summary
A method for producing an additively manufactured object includes melting and solidifying a filler metal by use of an arc, and depositing and forming a plurality of layers of molten beads to produce a built-up object, and the method includes: shaping the molten bead of a previous layer; and monitoring a temperature of the molten bead of the previous layer. Shaping of the molten bead of a next layer is started when the temperature of the molten bead of the previous layer is equal to or lower than an allowable interpass temperature.