Magnesium (Mg) alloys have a low density among the structural metals, but it is hard to be plastically deformed due their crystallographic nature. Wire arc additive manufacturing (WAAM) could one of alternative processes fabricate Mg products for various industrial applications. Nonetheless, used in limited fields challenging issues such as commercial availability wire, high oxygen affinity, explosive and flammable hazard, typical defects WAAM like distortion side collapse, grain coarsening,...

The microstructure and mechanical properties of adjustable-ring-mode (ARM) laser-welded, hot-stamped 22MnB5 steel joints were analyzed compared with those Al–Si coated 22MnB5. Al segregation into the fusion zone (FZ) was suppressed by a ring beam introduced via ring-beam-mode (RBM) dual-beam-mode (DBM) laser welding. Dilution coating in FZ induced α-ferrite formation during hot stamping. After stamping, fraction decreased (from 23 vol% to 4.27 vol%) more than that center-beam-mode (CBM)...

In this study, the effects of electrode surface design on resistance spot weldability and degradation following welding (RSW) aluminum 6014-T4 alloy were investigated. A new patterning method that can be produced through repetitive pressurization was applied to electrode, producing a lattice-like pattern shape resulting patterned electrode. When RSW performed using lattice contact decreased because effective removal oxide film from alloy. As result, heat generated by E/S interface reduced....

This study investigate the effect of weld mechanical properties and failure mode on distance misalignment that occurs during resistance element welding (REW) when base sheet (steel plate) overlaps cover (aluminum plate). Differences exist in tensile shear strength, cross tension ductility ratio, based misalignment. The length nugget diameter is a major factor influences REW. In addition, it necessary to consider, asymmetrical shape derived from abnormal current path which itself results an...

This study was performed to compare the resistance spot weldability of Al 5052-H32 alloy and 6014-T4 alloy, cause differences in investigated. In general, surface aluminum has an oxide film several nm thick, local heat input is generated at electrode-sheet interface sheet-sheet during welding. XPS analysis proved that 5052- H32 a relatively thick magnesium on contains large amount solute element. As result, higher resistance, both contact electrodesheet interface, compared with alloy....

In this study, the growth behavior of nugget and button diameter according to pre-welding conditions was investigated using dynamic resistance in spot welding. single welding condition, generated when current stronger than 15 kA. When increased more 35 kA, shape unbalanced because Peltier effect too strong. With multi-welding reduced melting concentrated center, compared single-welding condition. This occurs it plays a role lowering surface extension conduction area at faying by...

The current demand for vehicles with high fuel efficiency, which has improved their safety, as well enhanced crash worthiness qualities is being met by the use of high-strength components fabricated via hot stamping process. Most Al-Si coated layer applied to prevent oxidation and decarburization caused this During laser welding, diluted in fusion zone segregation, ferrite formed some areas, causing deterioration mechanical properties. In paper, we provide a comprehensive review weldability...

Recently, lightweight vehicle bodies are in increasing demand to satisfy exhaust gas and environmental regulations around the world. In particular, aluminum alloys widely used manufacture parts, because of their excellent properties including corrosion resistance mechanical properties. After forming process, welding process is important for manufacturing alloy parts. Resistance has several problems, due internal weld defects such as cracks, shrinkage cavity, or porosity, which can result...

Aluminum exhibits excellent workability and formability due to its crystallographic properties has outstanding specific strength, making it widely used in various industries. In particular, is applied the automotive industry, welding methods are being advance joining technology. Among these methods, hybrid welding, which combines laser arc been extensively researched overcome limitations of both conventional resulting high-quality welds. However, there a lack studies comparing...

In this study, the effect of Al-Si coating melting behavior and weldability during resistance spot welding hot stamped boron steels was investigated. case coated hot-stamped steel, high heat generated on surface oxide layer by intermetallic coating, molten pushed toward outer edge weld like a film liquid. The liquid accumulated at periphery, preventing current flow extension contact area, influenced height nugget growth. As result limited growth, strength decreased. However, in bare...

This study entailed resistance spot welding conducted using 1.8 GPa-grade hot stamping boron steel heat-treated under varied conditions. The relationship between weldability and melting behavior of the intermetallic layer during was examined. As regards four heat treatment conditions beyond austenitic temperature, it found that thickened with increased time temperature. Furthermore, contact also temperature treatment. mainly because expansion area Al-Fe-based phases (e.g., FeAl2 Fe2Al5)...

This study evaluated the effect of preheating on early stage melting behavior a Al-Si coated hot stamped boron steel bolt during projection welding. A large amount heat was generated in Because generation, rapid collapse occurred and molten coating layer remained interface welded part. caused welding defects such as expulsion porosity. However, helped remove by pushing it out toward outer edge pool. suggests that can effectively minimize or within weld. Preheating also prevented partially...

Magnesium (Mg) alloys have a low density among the structural metals, but it is hard to be plastically deformed due their crystallographic nature. Wire arc additive manufacturing (WAAM) could one of alternative processes fabricate Mg products for various industrial applications. Nonetheless, has not been yet barely used in fields challenging issues such as commercial availability wire, high oxygen affinity, explosive and flammable hazard, typical defects WAAM like distortion side collapse,...

The microstructure and mechanical properties of adjustable-ring-mode (ARM) laser-welded, hot-stamped 22MnB5 steel joints were analyzed compared with those Al–Si coated 22MnB5. Al segregation into the fusion zone (FZ) was suppressed by a ring beam introduced via ring-beam-mode (RBM) dual-beam-mode (DBM) laser welding. Dilution coating in FZ induced α-ferrite formation during hot stamping. After stamping, fraction decreased (from 23 vol% to 4.27 vol%) more than that center-beam-mode (CBM)...