MIG and TIG Joining of AA1070 Aluminium Sheets with Different Surface Preparations

In this work, AA1070 aluminium alloy sheets are joined using TIG and MIG welding after three different edge preparations. Shearing, water jet and plasma-cut processes were used to cut sheets, subsequently welded using ER5356 and ER4043 filler metals for TIG and MIG, respectively. Mechanical properti...

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Bibliographic Details
Published in:Materials 2022-01, Vol.15 (2), p.412
Main Authors: Fracchia, Elisa, Bidulská, Jana, Bidulský, Róbert, Actis Grande, Marco
Format: Article
Language:English
Subjects:
Alloys
Aluminum base alloys
Corrosion resistance
Ductile fracture
Friction stir welding
Gas metal arc welding
Gas tungsten arc welding
Heat conductivity
Hydraulic jets
Mechanical properties
Metal sheets
Metals
Microhardness
Microstructure
Oxidation
Particle size
Performance evaluation
Plasma
Precipitation hardening
Shearing
Surface preparation
Tensile properties
Tensile tests
Tightness
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Summary:In this work, AA1070 aluminium alloy sheets are joined using TIG and MIG welding after three different edge preparations. Shearing, water jet and plasma-cut processes were used to cut sheets, subsequently welded using ER5356 and ER4043 filler metals for TIG and MIG, respectively. Mechanical properties of the obtained sheets were assessed through tensile tests obtaining a relation between sheet preparation and welding tightness. Micro-hardness measures were performed to evaluate the effects of both welding and cutting processes on the micro-hardness of the alloy, highlighting that TIG welding gives rise to inhomogeneous micro-hardness behaviour. After tensile tests, surface fractures were observed employing scanning electron microscopy to highlight the relation between tensile properties and edge preparations. Fractures show severe oxidation in the water jet cut specimens, ductile fractures and gas porosities.
ISSN:1996-1944
1996-1944
DOI:10.3390/ma15020412