Sensorless Induction Welding of Carbon Fiber Reinforced Plastic Components
(2020)Department of Automatic Control
- Abstract
- In this work, a method to estimate the weld-zone temperature during induction welding of carbon fiber reinforced plastics (CFRP) is developed. Today several methods exist to measure, or in other ways ensure, the correct temperature in the weld. However, these methods all have some form of drawback ranging from leaving foreign material in the weld to complex sensor arrangements. The induction welding process is run by a frequency inverter. By using the current measured by the frequency inverter the temperature in the weld-zone can be estimated and no external sensors are needed. The impedance the inductor is experiencing during welding is changing due to the changes to the electrical properties of the CFRP material. The changing resistance,... (More)
- In this work, a method to estimate the weld-zone temperature during induction welding of carbon fiber reinforced plastics (CFRP) is developed. Today several methods exist to measure, or in other ways ensure, the correct temperature in the weld. However, these methods all have some form of drawback ranging from leaving foreign material in the weld to complex sensor arrangements. The induction welding process is run by a frequency inverter. By using the current measured by the frequency inverter the temperature in the weld-zone can be estimated and no external sensors are needed. The impedance the inductor is experiencing during welding is changing due to the changes to the electrical properties of the CFRP material. The changing resistance, in particular, results in a changing impedance which can be observed by measuring the phase angle. With the current measured by the frequency inverter as input signal to a Wiener model, identified using a black-box modeling approach, the temperature in the weld-zone can be estimated. The model constructed in this work is to be used at the fixed operating frequency of 640 kHz, with the welding starting at room temperature and is validated on the specific CFRP material and workpiece geometry used in this work. (Less)
Please use this url to cite or link to this publication:
http://lup.lub.lu.se/student-papers/record/9033240
- author
- Bladh, Johan
- supervisor
- organization
- year
- 2020
- type
- H3 - Professional qualifications (4 Years - )
- subject
- report number
- TFRT-6113
- other publication id
- 0280-5316
- language
- English
- id
- 9033240
- date added to LUP
- 2020-12-23 11:19:04
- date last changed
- 2021-01-22 13:47:45
@misc{9033240,
abstract = {{In this work, a method to estimate the weld-zone temperature during induction welding of carbon fiber reinforced plastics (CFRP) is developed. Today several methods exist to measure, or in other ways ensure, the correct temperature in the weld. However, these methods all have some form of drawback ranging from leaving foreign material in the weld to complex sensor arrangements. The induction welding process is run by a frequency inverter. By using the current measured by the frequency inverter the temperature in the weld-zone can be estimated and no external sensors are needed. The impedance the inductor is experiencing during welding is changing due to the changes to the electrical properties of the CFRP material. The changing resistance, in particular, results in a changing impedance which can be observed by measuring the phase angle. With the current measured by the frequency inverter as input signal to a Wiener model, identified using a black-box modeling approach, the temperature in the weld-zone can be estimated. The model constructed in this work is to be used at the fixed operating frequency of 640 kHz, with the welding starting at room temperature and is validated on the specific CFRP material and workpiece geometry used in this work.}},
author = {{Bladh, Johan}},
language = {{eng}},
note = {{Student Paper}},
title = {{Sensorless Induction Welding of Carbon Fiber Reinforced Plastic Components}},
year = {{2020}},
}