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Effect of Laser Welding Parameters on Porosity of Weldsin Cast Magnesium Alloy AM50
Högskolan Väst, Institutionen för ingenjörsvetenskap, Forskningsmiljön produktionsteknik(PTW). Swerea KIMAB, Kista, University West, Sweden. (PTW)ORCID-id: 0000-0001-8933-6720
The Welding Institute, Great Britain.
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för svetsteknologi (SV). (PTW)ORCID-id: 0000-0001-8822-2705
Högskolan Väst, Institutionen för ingenjörsvetenskap, Avdelningen för svetsteknologi (SV). (PTW)ORCID-id: 0000-0003-2560-0531
2018 (engelsk)Inngår i: Modern Approaches on Material Science, ISSN 2641-6921, Vol. 1, nr 2, s. 25-32Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Pores in the weld metal lower the mechanical properties of the weld. It is therefore important to understand the pore formation mechanisms and find procedures that could reduce porosity. This study focused on laser welding of 3 mm thick magnesium alloy AM50, investigating how different parameters affect porosity formation. Low levels of porosity content were achieved by either increasing the welding speed or using a two-pass welding approach. It was found that higher welding speeds did not allow pores,which were pre-existing from the die-casting process, to have sufficient time to coalesce and expand. In the two-pass welding technique, pores were removed as a result of a degassing process which occurred through the second pass.

sted, utgiver, år, opplag, sider
2018. Vol. 1, nr 2, s. 25-32
Emneord [en]
Laser welding; Magnesium, Cast; Metallurgy; Porosity; Automotive; AM50
HSV kategori
Forskningsprogram
Produktionsteknik
Identifikatorer
URN: urn:nbn:se:hv:diva-13754DOI: 10.32474/MAMS.2018.01.000106OAI: oai:DiVA.org:hv-13754DiVA, id: diva2:1301261
Tilgjengelig fra: 2019-04-01 Laget: 2019-04-01 Sist oppdatert: 2019-04-01bibliografisk kontrollert
Inngår i avhandling
1. Laser welding of ultra-high strength steel and a cast magnesium alloy for light-weight design
Åpne denne publikasjonen i ny fane eller vindu >>Laser welding of ultra-high strength steel and a cast magnesium alloy for light-weight design
2019 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

There is a strong industrial need for developing robust and flexible manufacturing methods for future light-weight design. Better performing, environmental friendly vehicles will gain competitive strength from using light weight structures. In this study, focus has been on laser welding induced distortions for ultra-high strength steel (UHSS) where trials were performed on single hat and double hat beams simulating A-pillar and B-pillar structures. Furthermore, also laser welding induced porosity in cast magnesium alloy AM50 for interior parts were studied. For UHSS, conventional laser welding was done in a fixture designed for research. For cast magnesium, single-spot and twin-spot welding were done. Measurements of final distortions and metallographic investigations have been performed. The results show that the total weld metal volume or the total energy input were good measures for predicting the distortions within one steel grade. For comparing different steel grades, the width of the hard zone should be used. The relation between the width of the hard zone, corresponding to the martensitic area of the weld, and the distortions is almost linear. Additionally, compared with continuous welds, stitching reduced the distortions. For cast magnesium, two-pass (repeated parameters) welding with single-spot gave the lowest porosity of approximately 3%. However, two-pass welding is not considered production friendly. Twin-spot welding was done, where the first beam provided time for nucleation and some growth of pores while reheating by the second beam should provide time for pores to grow and escape. This gave a porosity of around 5%. Distortions and porosity are the main quality problems that occur while laser welding UHSS and cast magnesium, respectively. Low energy input seems to generally minimize quality issues. Laser welding shows high potential regarding weld quality and other general aspects such as productivity in light-weight design for both high strength steel and cast magnesium.

sted, utgiver, år, opplag, sider
Trollhättan: University West, 2019. s. 94
Serie
PhD Thesis: University West ; 29
Emneord
Laser welding, ultra-high strength steel, cast magnesium alloy, light-weight design, automotive industry, distortion, porosity
HSV kategori
Forskningsprogram
Produktionsteknik
Identifikatorer
urn:nbn:se:hv:diva-13752 (URN)978-91-88847-29-4 (ISBN)978-91-88847-28-7 (ISBN)
Disputas
2019-04-24, F131, Trollhättan, 10:00 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2019-04-02 Laget: 2019-04-01 Sist oppdatert: 2019-04-01bibliografisk kontrollert

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