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  • 1.
    Ratanathavorn, Wallop
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Svetsteknologi.
    A study of weld formation in friction stir welding of electrogalvanised steel to aluminium alloy in lap joint configurationInngår i: Journal of Materials Processing Technology, ISSN 0924-0136, E-ISSN 1873-4774Artikkel i tidsskrift (Fagfellevurdert)
  • 2.
    Ratanathavorn, Wallop
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Development and evaluation of hybrid joining for metals to polymers using friction stir welding2015Licentiatavhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Combinations of different materials are increasingly used in the modern engineering structures. The driving forces of this trend are rising fuel costs, global warming, customer demands and strict emission standards. Engineers and industries are forced to improve fuel economy and cut emissions by introducing newly design engines and lightweighting of structural components. The use of lightweight materials in the structures has proved successful to solve these problems in many industries especially automobile and aerospace. However, industry still lacks knowledge how to manufacture components from polymeric materials in combination with metals where significant differences exist in properties.

    This thesis aims to demonstrate and generate the methodology and guidelines for hybrid joining of aluminium alloys to thermoplastics using friction stir welding. The developed technique was identified, optimized and evaluated from experimental data, metallography and mechanical characterization. The success of the technique is assessed by benchmarking with recent literatures.

    In this work, lap joints between aluminium alloys (AA5754, AA6111) and thermoplastics (PP, PPS) were produced by the friction stir welding technique. The specimens were joined with the friction stir welding tools under as-received conditions. Metallic chips were generated and merged with the molten thermoplastic to form a joint under the influence of the rotating and translating tool. The effects of process parameters such as rotational speed, translational speed and distance to backing were analyzed and discussed. The investigation found joint strength was dominated by mechanical interlocking between the stir zone and the aluminium sheet. The results also show that the joint strength is of the same order of magnitude as for other alternative joining techniques in the literature.

  • 3.
    Ratanathavorn, Wallop
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Svetsteknologi.
    Dissimilar joining of aluminium to ultra-high strength steels by friction stir welding2017Doktoravhandling, med artikler (Annet vitenskapelig)
    Abstract [en]

    Multi-material structures are increasingly used in vehicle bodies to reduce weight of cars. The use of these lightweight structures is driven by requirements to improve fuel economy and reduce CO2 emissions. The automotive industry has replaced conventional steel components by lighter metals such as aluminium alloy. This is done together with cutting weight of structures using more advanced strength steels. However, sound joining is still difficult to achieve due to differences in chemical and thermal properties.

     

    This research aims to develop a new innovative welding technique for joining aluminium alloy to ultra-high strength steels. The technique is based on friction stir welding process while the non-consumable tool is made of an ordinary tool steel. Welding was done by penetrating the rotating tool from the aluminium side without penetrating into the steel surface. One grade of Al-Mg aluminium alloy was welded to ultra-high strength steels under lap joint configuration. Different types of steel surface coatings including uncoated, hot-dipped galvanised and electrogalvanised coating have been studied in order to investigate the influence of zinc on the joint properties. The correlation among welding parameters, microstructures, intermetallic formation and mechanical properties are demonstrated in this thesis.  Results have shown that friction stir welding can deliver fully strong joints between aluminium alloy and ultra-high strength steels. Two intermetallic phases, Al5Fe2 and Al13Fe4, were formed at the interface of Al to Fe regardless of surface coating conditions. The presence of zinc can improve joint strength especially at low heat input welding due to an increased atomic bonding at Al-Fe interface. The formation of intermetallic phases as well as their characteristics has been demonstrated in this thesis. The proposed welding mechanisms are given based on metallography investigations and related literature.

  • 4.
    Ratanathavorn, Wallop
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Melander, Arne
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Svetsteknologi.
    A study of friction stir welded joint between AA5754 and ultra-high strength steel in hot dip galvanized condition2014Inngår i: 10th Friction Stir Welding Symposium, Beijing, China, 2014, s. S2B-P5-Konferansepaper (Fagfellevurdert)
  • 5.
    Ratanathavorn, Wallop
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion. KTH, Centra, XPRES, Excellence in production research. Swerea KIMAB AB, Sweden.
    Melander, Arne
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion. KTH, Centra, XPRES, Excellence in production research. Swerea KIMAB AB, Sweden.
    Dissimilar joining between aluminium alloy (AA 6111) and thermoplastics using friction stir welding2015Inngår i: Science and technology of welding and joining, ISSN 1362-1718, E-ISSN 1743-2936, Vol. 20, nr 3, s. 222-228Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this work, friction stir welding was used to produce shear overlap joints between aluminium and a thermoplastic (AA 6111 to polyphenylene sulphide). The process uses the friction stir welding tool to create metallic chips which merge with the molten thermoplastic to form a joint. No special surface pretreatment is required before joining. Cross-sections show mechanical locking between the chipped polymer filled zone and the surrounding aluminium sheet. The effects of joining parameters such as rotational speed, translational speed and distance to backing were investigated in relation to the joint strength and failure mode. Optimum speeds and backing distances could be identified. The joint strength is dominated by mechanical interlocking between the chip and polymer filled zone and the aluminium sheet.

  • 6.
    Ratanathavorn, Wallop
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Melander, Arne
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Svetsteknologi.
    Dissimilar joining between alumnium alloy AA6111 and thermoplastics using friction stir weldiing2015Inngår i: Science and technology of welding and joining, ISSN 1362-1718, E-ISSN 1743-2936Artikkel i tidsskrift (Fagfellevurdert)
  • 7.
    Ratanathavorn, Wallop
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Svetsteknologi.
    Melander, Arne
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Svetsteknologi.
    Influence of zinc on intermetallic compounds formed in friction stir welding of AA5754 aluminium alloy to galvanised ultra-high strength steel2017Inngår i: Science and technology of welding and joining, ISSN 1362-1718, E-ISSN 1743-2936Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    In this study, lap joints between AA5754 and DP1000 ultra-high strength steels were producedby friction stir welding. In order to investigate the roles of zinc on intermetallic phase formation and joint properties, steel substrates were used, two being galvanised coated and one uncoated. Joint performance has been evaluated in term of maximum tensile shear loading. The effects ofthe process parameter, translational speed; chemical compositions; and intermetallic phase formationon the mechanical properties have been investigated. The results show that joints witha galvanised layer exhibit higher strength as compared to the non-coated steel. A thicker galvanisedlayer promotes the presence of zinc in the aluminium matrix, resulting in better jointproperties. The level of zinc contents in the aluminium matrix depends on process temperature and material circulation characteristics. Two stable Al-rich intermetallic phases, Al5Fe2 and Al13Fe4, were detected at the interface regardless of the coating conditions.

  • 8.
    Ratanathavorn, Wallop
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Melander, Arne
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Svetsteknologi.
    Joining of hybrid joints between thermoplastics and alumnium alloy by friction stir lap welding: a feasability study2014Inngår i: 10th Friction Stir Welding Symposioum, 2014, s. S6B-P4-Konferansepaper (Fagfellevurdert)
  • 9.
    Ratanathavorn, Wallop
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Melander, Arne
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Magnusson, Hans
    Swerea KIMAB.
    Intermetallic compounds in friction stirred lap joints between AA5754/galvanised ultra-high strength steel2016Inngår i: Science and technology of welding and joining, ISSN 1362-1718, E-ISSN 1743-2936, Vol. 21, nr 8, s. 653-659Artikkel i tidsskrift (Fagfellevurdert)
    Abstract [en]

    This paper presents results of joining of AA5754 and DP800 based on the friction stir welding process. Joints were produced by the tool made of H13 tool steel which was allowed to penetrate through the aluminium sheet until reaching the surface of steel sheet without penetrating into it. This approach is an economic and robust way to operate the dissimilar welding process without excessive tool cost. Bonding was achieved by interfacial diffusion reactions between aluminium and iron with a formation of intermetallic compounds. The formation of brittle intermetallic compounds at the interface between the materials was studied. Three intermetallic phases were found at the interface including Al13Fe4, Al5Fe2 and Fe3Zn10. A range of process parameters was identified with a thickness of the intermetallic layers around 2 mu m. Shear fracture failure mode was observed under overlap loading. The mechanisms of formation of the joints and factors controlling the strength were discussed.

  • 10.
    Rathanatavorn, Wallop
    et al.
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion.
    Melander, Arne
    KTH, Skolan för industriell teknik och management (ITM), Industriell produktion, Svetsteknologi.
    Lindh-Ulmgren, Eva
    Swerea KIMAB.
    Åkermo, Malin
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg.
    Burman, Magnus
    KTH, Skolan för teknikvetenskap (SCI), Farkost och flyg. mburman@kth.se.
    Hybrid joining of alumnium to thermoplastics with friction stir welding2012Inngår i: Proceedings Swedish production  Symposium 2012, 2012Konferansepaper (Fagfellevurdert)
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