| 1. |
- Adolfsson, Stefan, et al.
(författare)
-
Automatic Detection of Burn-through in GMA Welding Using a Parametric Model
- 1996
-
Ingår i: Mechanical Systems & Signal Processing. - London : Academic Press. - 0888-3270. ; 10:5, s. 633-651
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Tidskriftsartikel (refereegranskat)abstract
- This paper addresses the problem of automatic detection of burn-through in weld joints. Gas metal are (GMA) welding with pulsed current is used, and welding voltage and current are recorded. As short-circuitings are common between the welding electrode and the work piece during burn-through, a short-circuit detector is developed to detect these events. To detect another specific characteristic of burn-through-a broadband long-lasting voltage component-this detector is combined with a square-law detector. This second detector is based on a non-linear modification of an autoregressive model with extra input (ARX-model) of the welding process. The results obtained from this compound detector indicate that it is possible to detect burn-through in the welds automatically. The work also indicates that it is possible to design an on-line monitoring system for robotic GMA welding.
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| 2. |
- Adolfsson, Stefan, et al.
(författare)
-
Automatic detection of burn-through in GMA welding using a parametric model
- 1996
-
Ingår i: Mechanical systems and signal processing. - : Elsevier BV. - 0888-3270 .- 1096-1216. ; 10:5, s. 633-651
-
Tidskriftsartikel (refereegranskat)abstract
- This paper addresses the problem of automatic detection of burn-through in weld joints. Gas metal arc (GMA) welding with pulsed current is used, and welding voltage and current are recorded. As short-circuitings are common between the welding electrode and the work piece during burn-through, a short-circuit detector is developed to detect these events. To detect another specific characteristic of burn-through - this detector is combined with a square-law detector. This second detector is based on a non-linear modification of an autoregressive model with extra input (ARX-model) of the welding process. The results obtained from this compound detector indicate that it is possible to detect burn-through in the welds automatically. The work also indicates that it is possible to design an on-line monitoring system for robotic GMA welding.
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| 3. |
- Sturesson, Per-Olof, et al.
(författare)
-
Identification of the Statistical Properties of the Cutting Tool Vibration in a Continuous Turning Operation : Correlation to Structural Properties
- 1997
-
Ingår i: Mechanical Systems & Signal Processing. - : Academic Press. - 0888-3270. ; 11:3, s. 459-499
-
Tidskriftsartikel (refereegranskat)abstract
- The cutting force dynamics in alloyed steel, stainless steel and cast iron have been investigated, although a direct measurement of the cutting forces could not be carried out. Usually, the response of the tool holder shank is measured by strain gauges and will be dependent on the stochastic character of the applied load and the structural dynamic properties of the tool holder. The characterisation of the dynamic response of the tool holder shank relies here on a stochastic approach while the structural dynamic properties were evaluated by a normal mode analysis. The results from both the analysis and the experiments correlate well.
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