| 1. |
- Bergström, David
(author)
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The reflectance of steels and non-ferrous alloys : 2nd Pacific International Conference on Application of Lasers and Optics 2006
- 2006
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In: PICALO 2006 - 2nd Pacific International Conference on Applications of Laser and Optics - Conference Proceedings. - 0912035846 - 9780912035840 ; , s. 140-145
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Conference paper (other academic/artistic)abstract
- The measurement of reflectance is important for the analysis and modelling of laser-material interactions. Unfortunately, most of the reflectance data presently available consider only polished pure metals rather than the commercially available (unpolished, oxidised) alloys which are actually being processed. This paper presents the results of reflectance measurements carried out on as-received engineering grade metals including: hot and cold rolled mild steel, zinc coated mild steel, stainless steel, aluminium alloys, copper and brass. The measurements were made using an integrating sphere with an Nd:YLF laser at two wavelengths (1053 nm and 527 nm). The results obtained differ considerably from existing data for polished, pure metals and should help to improve the accuracy of laser-material interaction models.
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| 2. |
- Bergström, David, et al.
(author)
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The reflectance of steels and non-ferrous alloys to Nd:YAG and Nd:YLF laser light
- 2006
-
In: Peer reviewed conference proceedings. - Orlando, Fla. : Laser institute of America. - 0912035846 ; , s. 140-145
-
Conference paper (peer-reviewed)abstract
- The measurement of reflectance is important for the analysis and modelling of laser-material interactions. Unfortunately, most of the reflectance data presently available consider only polished pure metals rather than the commercially available (unpolished, oxidised) alloys which are actually being processed. This paper presents the results of reflectance measurements carried out on asreceived engineering grade metals including: hot and cold rolled mild steel, zinc coated mild steel, stainless steel, aluminium alloys, copper and brass. The measurements were made using an integrating sphere with an Nd:YLF laser at two wavelengths (1053 nm and 527 nm). The results obtained differ considerably from existing data for polished, pure metals and should help to improve the accuracy of laser-material interaction models.
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| 3. |
- Kaplan, Alexander, et al.
(author)
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Cleaning oxides from metal artifacts using a frequency-doubled Nd:YAG laser
- 2006
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In: Peer reviewed conference proceedings. - Orlando, Fla. : Laser institute of America. - 0912035846 ; , s. 305-310
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Conference paper (peer-reviewed)abstract
- This paper presents the results of an experimental program investigating the ablation of oxides from copper alloy surfaces using a frequency doubled Nd:YAG laser. A collection of coins with similar levels of surface oxidation were cleaned using range of laser pulsing parameters on dry, wet and submerged surfaces. It was discovered that laser cleaning was always associated with one of two types of coin surface damage. At higher powers the damage took the form of surface melting and at lower powers the incident laser beam converted the original oxide layer into adherent droplets of molten metal
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| 4. |
- Wouters, Marc, et al.
(author)
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The influence of the joint gap on the strength of hybrid Nd:YAG laser-MIG welds
- 2006
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In: Peer reviewed conference proceedings. - Orlando, Fla. : Laser institute of America. - 0912035846 ; , s. 169-173
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Conference paper (peer-reviewed)abstract
- This paper presents the results of an experimental and theoretical analysis of the effect of joint gap on the strength of hybrid laser-MIG welds. The welds were of the partial penetration butt type with various joint gaps but identical weld penetration. Impact testing established that a zero gap gave a weak weld because the weld geometry contained the equivalent of a sharp crack where the unwelded parts met each other. A small gap between the workpieces improved the weld impact strength as the sharp crack effect became dissipated. Further increases in gap width resulted in a weakening of the joint and this is the subject of a discussion on joint gap optimization
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